Antarctica’s winter sea ice usually forms a bright lid over millions of square miles. So when a massive, black patch was spotted by NASA scientists for the first time, satellite operators were taken aback, to say the least.



Then roughly a year later, the situation got even stranger. The gap, called a polynya, swelled to the size of Switzerland and stayed open for weeks.



Only after it refroze did researchers start piecing together how such an enormous opening in the ice could appear hundreds of miles from the nearest shoreline - right above a submerged plateau named Maud Rise.



<h2 class="wp-block-heading" id="h-understanding-polynyas-the-basics">Understanding polynyas - the basics</h2>



<a href="https://www.earth.com/news/carbon-storage-mystery-emerges-in-the-southern-ocean/" target="_blank" rel="noreferrer noopener">The Southern Ocean</a> is normally a layer cake. A thin cap of cold, relatively fresh water floats over saltier, warmer layers, and that slight density difference keeps the column from churning. 



A mid‑ocean polynya needs the cake to collapse. Salt must slip into the surface, make the top layer heavier, and flip the stack. 



Once that happens, convection kicks in, the lid fractures, heat pours skyward, and the ocean “breathes” gases.



Coastal versions manage something similar each year because fierce winds shove ice away from land. Out on the high seas, though, the phenomenon is much less common.



<a href="https://en.wikipedia.org/wiki/Maud_Rise" target="_blank" rel="noreferrer noopener">Maud Rise</a>, a 4,600‑foot‑tall seamount, may provide the missing ingredient by diverting currents and trapping water in tight spirals.



<h2 class="wp-block-heading" id="h-stubborn-patch-over-maud-rise">Stubborn patch over Maud Rise</h2>



History backs that hunch. Between 1974 and 1976, a much larger hole lingered over Maud Rise each winter. 



The Maud Rise polynya was discovered in the 1970s, when remote‑sensing satellites capable of observing <a href="https://www.earth.com/news/rapid-antarctic-sea-ice-loss-is-causing-severe-storms-around-the-world/" target="_blank" rel="noreferrer noopener">sea ice</a> over the Southern Ocean were first launched. 



It persisted through consecutive winters from 1974 to 1976, and oceanographers at the time assumed it would become an annual occurrence. But since the 1970s, it has occurred only sporadically and for brief intervals.



<figure class="wp-block-image aligncenter size-full is-resized"><a href="https://www.earth.com/wp-content/uploads/2025/04/antarctica_sea-ice-hole_Maud-Rise-polynya_switzerland-size_blue-ice_credit-NASA_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/04/antarctica_sea-ice-hole_Maud-Rise-polynya_switzerland-size_blue-ice_credit-NASA_1s.webp" alt="An arial view of the Maud Rise polynya. Scientists were baffled as to how this formed but now have an explanation. Credit: NASA Earth Observatory" class="wp-image-1966649" style="width:300px;height:auto"/></a><figcaption class="wp-element-caption">An arial view of the Maud Rise polynya. Scientists were baffled as to how this formed but now have an explanation. Click image to enlarge. Credit: NASA Earth Observatory</figcaption></figure>



“2017 was the first time that we've had such a large and long‑lived polynya in the Weddell Sea since the 1970s,” said Aditya Narayanan of the <a href="https://www.southampton.ac.uk/" target="_blank" rel="noreferrer noopener">University of Southampton</a>, lead author of the study in Science Advances. 



He joined colleagues to probe the comeback with robotic floats, tagged elephant seals, and a high‑resolution <a href="https://www.earth.com/news/shrinking-sea-ice-what-record-lows-tell-us-about-the-future/" target="_blank" rel="noreferrer noopener">ocean model</a>.



<h2 class="wp-block-heading" id="h-salt-storms-and-a-hidden-conveyor">Salt, storms, and a hidden conveyor</h2>



During those winters, the clockwise Weddell Gyre sped up. That spin drew a deep layer of warm, salty water nearer the surface, softening ice from below. Yet the meltwater should have freshened the lid and shut down mixing.



"This upwelling helps to explain how the sea ice might melt. But as sea ice melts this leads to a freshening of the surface water, which should in turn put a stop to the mixing," explained Fabien Roquet, a Professor in Physical Oceanography at the <a href="https://www.gu.se/en" target="_blank" rel="noreferrer noopener">University of Gothenburg</a> and co-author of the research. 



"So, another process must be happening for the polynya to persist. There must be an additional input of salt from somewhere."



Roaring extratropical storms supplied part of that punch. Their swirling winds flung sea ice outward and dragged briny water toward Maud Rise. 



Atmospheric rivers - plumes of moist air stretching a thousand miles - added warmth from above, helping strip away stratification.



<h2 class="wp-block-heading" id="h-ekman-transport-as-the-missing-shove">"Ekman transport" as the missing shove</h2>



A final push came from physics first described a century ago. When wind blows across the ocean, Earth’s rotation deflects the surface flow roughly 90 degrees, a process called <a href="https://oceanservice.noaa.gov/education/tutorial_currents/04currents4.html" target="_blank" rel="noreferrer noopener">Ekman transport</a>. 



The model showed this flow steering salt‑laden water onto the northern flank of Maud Rise, exactly where the 2017 hole opened. 



“Ekman transport was the essential missing ingredient that was necessary to increase the balance of salt and sustain the mixing of salt and heat towards the surface water,” said co‑author Alberto Naveira Garabato, also from the University of Southampton.



The storms didn’t just move ice; they herded the right water into the right spot, letting convection roar. By late September, the opening had vented more than twenty times the heat that normally seeps through unbroken ice before finally freezing again.



<h2 class="wp-block-heading" id="h-polynyas-have-a-global-impact">Polynyas have a global impact</h2>



A hole in the <a href="https://www.earth.com/news/southern-ocean-absorbs-more-co2-than-previously-thought/" target="_blank" rel="noreferrer noopener">Southern Ocean</a> sea ice may look local, yet its fingerprints show up far away. 



“The imprint of polynyas can remain in the water for multiple years after they've formed," noted Professor Sarah Gille from University of California San Diego (<a href="https://www.ucsd.edu" target="_blank" rel="noreferrer noopener">UCSD</a>), another co-author of the research



"They can change how water moves around and how currents carry heat toward the continent. The dense waters that form here can spread across the global ocean.” 



Deep convection hauls carbon‑rich water upward, where it can release CO₂, and sends newly formed, oxygen‑rich brine sliding along the seafloor.



<h2 class="wp-block-heading" id="h-what-happens-next">What happens next?</h2>



That heavy brine eventually feeds the global conveyor belt of currents that helps regulate climate. Because the Maud&nbsp;Rise mechanism hinges on a stronger gyre and stormier skies, its future frequency could ride on winds already shifting as the planet warms.



“For the first time since observations began in the 1970s, there's a <a href="https://www.earth.com/news/record-low-antarctic-sea-ice-and-rapid-melting-pace-stuns-climate-scientists/" target="_blank" rel="noreferrer noopener">negative trend in sea ice</a> in the Southern Ocean, which began around 2016. Before then, it had remained somewhat stable," Professor Gille concluded.



The same rise of warm, salty water that primed the 2017 hole now seems to be thinning ice across Antarctica’s fringe.



Scientists will watch the next few winters closely. Whether the polynya returns or not, its story shows that the frozen edge of the world can still spring surprises - and that what happens far south seldom stays there, for the wider planet.



The full study was published in the journal <a href="https://www.science.org/doi/10.1126/sciadv.adj0777" target="_blank" rel="noreferrer noopener">Science Advances</a>.



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Massive hole the size of Switzerland appeared in the Antarctica sea ice, now we know why

Antarctica’s winter sea ice usually forms a bright lid over millions of square miles. So when a massive, black patch was spotted by NASA scientists for the first time, satellite operators were taken aback, to say the least. Then roughly a year later, the situation got even stranger. The gap, called a polynya, swelled to the size of Switzerland and stayed open for weeks. Only after it refroze did researchers start piecing together how such an enormous opening in the ice could appear hundreds of miles from...

Obama urges Vietnam youth to tackle climate change. Wrapping up a historic visit to Vietnam, U.S. President Barack Obama on Wednesday praised the country's next generation of leaders for being more conscious of the environment than previous ones and urged them to "do something about" climate change.
During his final public event here, Obama basked in the admiration of hundreds of young leaders who participated in a town hall-style event and prefaced some of their questions to him with praise about his leadership and his "inspiring speeches."Obama urges Vietnam youth to tackle climate change
Obama used a question about preserving a Vietnamese cave from development to pivot to climate change, one of his top issues as president. He said <a href="http://www.earth.com/image/typhoon-molave-intensifies-as-it-approaches-vietnam/">Vietnam</a> will be one of the countries most affected by the trend of warming temperatures and rising seas.
"That could have a huge impact on Vietnam's ability to feed its people, on fishermen, on farmers, and it could be a really big problem if we don't do something about it, so it's going to be up to you to start," said Obama, who routinely includes question-and-answer sessions with young leaders on his foreign trips.
"One of the great things about your generation is that you're already much more conscious about the environment than my generation was or previous generations were," said Obama. He had told a previous questioner that he "fooled around a lot" when he was young and wasn't serious about school.
"I was more into basketball and girls. I wasn't always that serious," Obama said. "You're already way ahead of me. That's good."
Obama also promoted a 12-nation, trans-Pacific trade pact that includes Vietnam but is stalled in the U.S. Congress and opposed by the three leading U.S. presidential candidates. But he avoided wading too deeply into politics when asked where he sees himself in five years, around the end of his successor's first term. Obama has said on previous occasions that world leaders ask him all the time about the unpredictable election.
"Sometimes, our politics doesn't express all the goodness of the people, but usually, eventually, the voters make good decisions and democracy works," Obama said. "So I'm optimistic that we'll get through this period."
As for his future, Obama said he expects to stay involved with public policy issues and return to his roots as an organizer. "I'll be like a community organizer, except a little more famous than I used to be."
The town-hall event capped Obama's historic visit to Vietnam. He spent three days in the capital of Hanoi, in the north, and in Ho Chi Minh City, in the south, meeting with government leaders and addressing the Vietnamese people in a speech and through less formal encounters, such as when "people were trying to take selfies" with him as he worked out in the hotel gym.
In a show of how deeply relations between the former wartime enemies had thawed, Obama announced the end of a five-decades-old ban on the sale of arms to Vietnam. He also announced that the Peace Corps would begin operating in the country for the first time.
In his appearances, Obama also pressed Vietnam to allow greater freedoms for its citizens, arguing that respect for human rights would improve the communist country's economy, stability and regional power. He returned to the issue Wednesday when a young Vietnamese woman asked about the importance of governments promoting the arts and culture.
"You've got to let people express themselves. That's part of what a modern 21st century culture is all about," Obama said.
Before the event, Obama met privately at the U.S. Consulate with staff and family members. The White House said the meeting included seven Foreign Service nationals who served at the U.S. Embassy during the evacuation of Saigon - the former name for Ho Chi Minh City - in 1975 during the Vietnam War.
Japan was the next and final stop on Obama's swing through Asia, a region he says helped shape him growing up in his native Hawaii and later in Indonesia. Among the officials greeting him at the airport late Wednesday was U.S. Ambassador Caroline Kennedy.
Obama planned to meet with Japanese Prime Minister Shinzo Abe late Wednesday before joining his counterparts for a summit of the Group of Seven industrialized nations opening Thursday in Shima, Japan. Japanese Chief Cabinet Secretary Yoshihide Suga said Abe would raise the recent arrest of a former U.S. Marine in connection with the murder of a Japanese woman on the southern island of Okinawa.
Obama also planned a historic visit Friday to Hiroshima, seven decades after the U.S. ushered in the nuclear age by dropping an atomic bomb to end World War II. Obama will be the first sitting U.S. president to visit Hiroshima.
---
Associated Press writers Mari Yamaguchi in Ise, Japan, and Darlene Superville in Washington contributed to this report.
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Obama urges Vietnam youth to tackle climate change

Obama urges Vietnam youth to tackle climate change. Wrapping up...

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Powering the 'Internet of Things' with clean energy. The "Internet of Things" could make cities "smarter" by connecting an extensive network of tiny communications devices to make life more efficient. But all these machines will require a lot of energy. Rather than adding to the global reliance on fossil fuels to power the network, researchers say they have a new solution. Their report on a single device that harvests wind and solar energy appears in the journal ACS Nano.

Computer industry experts predict that tens of billions of gadgets will make up the Internet of Things within just five years, according to news reports. They'll be in homes, syncing coffee makers to alarm clocks. They'll be in buildings, managing lights and air temperature. But they'll also require energy to run. Sustainably generating more energy in cities close to where the devices will be used is challenging. Cities don't have much <a href="http://www.earth.com/video/earth-from-space-houston-texas/">space</a> for towering wind turbines, for example. Ya Yang, Zhong Lin Wang and colleagues wanted to find a better way to power smart cities.

For the first time, the researchers have integrated two energy harvesting technologies in one: a silicon solar cell and a nanogenerator that can convert wind energy into electrical output. The solar cell component of the system delivers 8 milliWatts of power output (1 milliWatt can light up 100 small LEDs). The wind harvesting component delivers up to 26 milliWatts. Together, under simulated sun and wind conditions, four devices on the roof of a model home could turn on the LEDs inside and power a temperature-humidity sensor. Installed in large numbers on real rooftops, the hybrid device could help enable smart cities.
###
The authors acknowledge funding from the <a href="http://www.bjkw.gov.cn/n244495/n244682/2665091.html" target="_blank" rel="noopener noreferrer">Beijing Natural Science Foundation</a>, the <a href="http://www.nsfc.gov.cn/publish/portal1/" target="_blank" rel="noopener noreferrer">National Natural Science Foundation of China</a>, External Cooperation Program of BIC, the <a href="http://english.cas.cn/" target="_blank" rel="noopener noreferrer">Chinese Academy of Sciences</a>, the 2015 Annual Beijing Talents Fund and China's Thousand Talents Program.

The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With nearly 157,000 members, ACS is the world's largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.

To automatically receive news releases from the American Chemical Society, contact <a href="mailto:newsroom@acs.org">newsroom@acs.org</a>.

Follow us: <a href="https://www.twitter.com/ACSpressroom" target="_blank" rel="noopener noreferrer">Twitter</a> <a href="https://www.facebook.com/pages/American-Chemical-Society-Pressroom/130342583687829" target="_blank" rel="noopener noreferrer">Facebook</a>

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Powering the 'Internet of Things' with clean energy

Powering the 'Internet of Things' with clean energy. The "Internet...

<div>

How will climate change affect the speed of sound under water?. Scientists are studying how climate change will affect the speed of sound under water to help prepare the U.S. Navy for operating in progressively warmer oceans.

Light doesn't travel very far underwater so the navy uses sound to transmit messages. The speed of underwater sound depends on a combination of temperature, salinity and pressure. It's a complicated equation, but temperature is the biggest factor, says Glen Gawarkiewicz, an oceanographer at Woods Hole Oceanographic Institution in Massachusetts.

Understanding sound speed is crucial for transmitting messages, detecting enemy submarines and avoiding marine animals. As climate change elevates temperatures, understanding underwater sound speed will become increasingly important.

"[We] haven't had to deal with this issue of climate change until the last 15 years, but the temperature changes are significant enough that it really is having an impact on how sound travels in the ocean," Gawarkiewicz said. He and his colleagues will present their research on the effect of climate change on sonar this week at the 171st meeting of the Acoustical Society of America, held May 23 - 27 in Salt Lake City.

Gawarkiewicz and his team, with funding from the Office of Naval Research, use a torpedo-like autonomous underwater vehicle to study temperature's influence on sound speed. The vehicle emits sounds that are picked up by a receiver. Sound travels faster through warmer water and slower through colder water. By measuring the exact speed of different temperatures, scientists can help create better communication and detection tools.

This is important because submarines have become more challenging to detect. As technology has improved even more over the past few decades, it's become even more difficult to discover underwater craft. Climate change will only make detection more challenging.

"It's getting harder and harder to detect these subs, and the ocean is getting noisier and noisier with commercial shipping," Gawarkiewicz said.

"You have snappy shrimp making noise and fish making noise, and you might be hearing oil platforms," he added. "It's a huge challenge to try and detect underwater sources."

Experts use underwater sound research to locate missing planes. The black boxes on airplanes have signals on them that send out bursts of sound. If the water is significantly warmer or cooler than normal, this could throw off any hope of finding the plane wreckage and figuring out what happened.

Sound speed is also important for the health of wildlife. Major shipping routes and oil platform construction often take wildlife into consideration. By mapping the speed of sound, scientists can prevent harmful noises from traveling far enough to mess up an animal's migratory patterns or mating grounds.

"If you know that whales hang out in a certain area and you're thinking of putting in an oil platform you'd want to know how close you can be without affecting the whales," Gawarkiewicz said.

Presentation #3AUW3 "Recent oceanographic variability and warming of the continental shelf south of New England and implications for acoustic propagation and sub-bottom characterization," by Glen Gawarkiewicz will take place on Wednesday, May 25, 2016, at 8:45 AM MDT in Salon A. The abstract can be found by searching for the presentation number here: <a href="http://acousticalsociety.org/content/spring-meeting-itinerary-planner" target="_blank" rel="noopener noreferrer">http://acousticalsociety. org/ content/ spring-meeting-itinerary-planner</a>
###
ABOUT THE MEETING

The 171st Meeting of the Acoustical Society of America (ASA) will be held May 23-27, 2016, at the Salt Lake Marriott Downtown at City Creek Hotel. It will feature more than 900 presentations on sound and its applications in physics, engineering, music, architecture and medicine. Reporters are invited to cover the meeting remotely or attend in person for free.

USEFUL LINKS

Main meeting website: <a href="http://acousticalsociety.org/content/spring-2016-meeting" target="_blank" rel="noopener noreferrer">http://acousticalsociety. org/ content/ spring-2016-meeting</a>
Itinerary planner and technical program: <a href="http://acousticalsociety.org/content/spring-meeting-itinerary-planner" target="_blank" rel="noopener noreferrer">http://acousticalsociety. org/ content/ spring-meeting-itinerary-planner</a>

WORLD WIDE PRESS ROOM

In the coming weeks, ASA's World Wide Press Room will be updated with additional tips on dozens of newsworthy stories and with lay-language papers, which are 400-900 word summaries of presentations written by scientists for a general audience and accompanied by photos, audio, and video. You can visit the site, beginning in early May, at (<a href="http://acoustics.org/current-meeting" target="_blank" rel="noopener noreferrer">http://acoustics. org/ current-meeting</a>).

PRESS REGISTRATION

We will grant free registration to credentialed journalists and professional freelance journalists. If you are a reporter and would like to attend, contact John Arnst (<a href="mailto:jarnst@aip.org">jarnst@aip.org</a>, 301-209-3096) who can also help with setting up interviews and obtaining images, sound clips, or background information.

LIVE MEDIA WEBCAST

A press briefing featuring a selection of newsworthy research will be webcast live from the conference on Tuesday, May 24. Topics and time of webcast to be announced.

ABOUT THE ACOUSTICAL SOCIETY OF AMERICA

The Acoustical Society of America (ASA) is the premier international scientific society in acoustics devoted to the science and technology of sound. Its 7,000 members worldwide represent a broad spectrum of the study of acoustics. ASA publications include The Journal of the Acoustical Society of America (the world's leading journal on acoustics), Acoustics Today magazine, books, and standards on acoustics. The society also holds two major scientific meetings each year. For more information about ASA, visit our website at <a href="http://www.acousticalsociety.org/" target="_blank" rel="noopener noreferrer">http://www. acousticalsociety. org</a>.

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How will climate change affect the speed of sound under water?

How will climate change affect the speed of sound under...

Decades of foothill forest growth erased due to severe drought. During the summer of 2015, survey flights conducted by the United States Forest Service (USFS) showed vast areas of dead and dying trees in the Sierra Nevada foothills and lower-elevation mountain areas of <a href="http://www.earth.com/image/wildfire-smoke-has-spread-across-much-of-california/">California</a>. Aircraft flew over four million acres of forested land and found that roughly 20 percent of stands had a distinct reddish-brownish coloration instead of a bright green, healthy leaf canopy. The toll was more than 10 million dead trees, region-wide.

To put this pattern of foothill forest decline into historical perspective, investigators at NASA’s Ames Research Center in California’s Silicon Valley published a study in April 2016 in the Journal of Earth Science &amp; Climatic Change. The paper documented NASA's unique three-decade record of vegetation cover change from the Landsat satellite and analyzed a series of detailed yearly maps to compare previous controls on forest growth rates and effects of recent fluctuations in water availability since the mid-1980s. Operating since the 1970s, the Landsat Earth-observing mission is operated jointly by NASA and the U.S. Geological Survey.

"NASA's satellite record offers abundant evidence that extensive tree die-back from the historically low water years of 2013 to 2015, combined with numerous large stand-replacing wildfires in the Sierra region, has essentially reversed the impressive accumulation of live tree density state-wide that we were tracking since the early 1980s,” said the study's lead author, Christopher Potter of Ames.

Three decades of foothill forest growth was erased by the drought's impacts over much of the lower-elevation Sierra Nevada mountain region in the past couple years.

The U.S. Weather Service defines drought as a deficiency in precipitation over an extended period resulting in water shortages that cause adverse impacts on vegetation, animals and people. The calendar year 2013 was the driest on record, with a total of just 30 percent of average statewide precipitation. A record low snowpack level in 2015 in the Sierra Nevada Mountains was unprecedented in comparison to the past 500 years – typical snow water levels in 2015 were detected at just five percent of the historical average.

Ames scientists began by examining Landsat satellite imagery at nearly all of the high tree die-back sites in the southern Sierra region flown by the USFS. The first outcome confirmed that changes in drought-sensitive satellite indices from the years 2011 to 2015 closely matched patterns of tree die-back across the USFS aerial survey locations in the southern Sierra region. But there was much more to learn; the satellite data record was analyzed further to put the 2013-2015 drought into historical context, particularly with respect to noticeable increases in forest canopy browning due to summer water limitations.

According to the satellite data, areas most severely impacted by constant water shortages were located just southwest of Yosemite, Kings Canyon, and Sequoia National Parks, and in the Sierra and Sequoia National Forests. The Landsat satellite data values at dying tree locations nearly resembled those from charred forest stands burned in the 2013 Rim Fire near Yosemite and the 2015 Rough Fire near Kings Canyon National Park.

This won’t be the end of the analysis of these regions. Potter says that Landsat images are provided by NASA at no cost to researchers every two weeks. “Our continued analysis of this unique, reliable satellite data over the next several years at these same Sierra aerial survey locations should help inform forest and park managers about the potential for further, delayed tree die-back,” Potter said. “It will also enable us to efficiently track subsequent recovery and regrowth rates of drought-affected forest stands during more favorable precipitation years."

To view the technical paper, visit:

<a href="http://www.omicsonline.org/open-access/landsat-image-analysis-of-tree-mortality-in-the-southern-sierra-nevadaregion-of-california-during-the-20132015-drought-2157-7617-1000342.pdf" target="_blank" rel="noopener noreferrer">http://www.omicsonline.org/open-access/landsat-image-analysis-of-tree-mortality-in-the-southern-sierra-nevadaregion-of-california-during-the-20132015-drought-2157-7617-1000342.pdf </a>

Decades of foothill forest growth erased due to severe drought

Decades of foothill forest growth erased due to severe drought....

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Fort McMurray fires cause air quality issues. The air quality around the entire Fort McMurray region remains very poor. The Alberta Health Services has issued warnings for the entire area with Health Quality Index of 10+ (very high risk of triggering health issues) reported in the area. As evidenced in these images from the morning and evening passes of the Terra and Aqua satellites respectively, huge amounts of smoke are still billowing into the atmosphere. The Alberta Health Services has issued an air-quality advisory for the Fort McMurray area, as well as a precautionary air-quality advisory for Edmonton and communities in the North Zone due to wildfires. Real-time air-quality data and information is available at: <a href="http://www.environment.alberta.ca/apps/aqhi/aqhi.aspx" target="_blank" rel="noopener noreferrer">http://www. environment. alberta. ca/ apps/ aqhi/ aqhi. aspx</a>.

Current fire conditions are high to extreme in northeastern Alberta. The Fort McMurray fire remains out of control and is estimated to cover 522,892 hectares (2019 sq. miles), including 2,496 hectares (almost 10 sq. miles) in Saskatchewan. A total of 17 wildfires are burning but only the Fort McMurray fire remains out of control.Fort McMurray fires cause air quality issues

The Government of Alberta website reports there are 1,989 firefighters, 88 helicopters, 253 pieces of heavy equipment and 25 air tankers currently battling the fires. Fort McMurray, Anzac, Gregoire Lake Estates, Fort McMurray First Nation and Fort McKay First Nation remain under a mandatory evacuation order.

This natural-color satellite image was collected by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua and Terra satellites on May 24, 2016. Actively burning areas, detected by MODIS's thermal bands, are outlined in red. NASA image courtesy Jeff Schmaltz, <a href="http://www.earth.com/image/hurricane-eta-caused-deadly-flooding-in-central-america/">MODIS</a> Rapid Response Team. Caption: NASA/Goddard, Lynn Jenner with information from the Alberta Government website.


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Fort McMurray fires cause air quality issues

Fort McMurray fires cause air quality issues. The air quality...

<div>

Clouds provide clues to predict global climate change. A research group from the CERN Cloud experiment, including scientists from Carnegie Mellon University's College of Engineering and Mellon College of <a href="http://www.earth.com/video/the-science-behind-big-80s-hair/">Science</a>, have uncovered the processes behind the formation and evolution of small atmospheric particles free from the influence of pollution. Their findings are key to creating accurate models to understand and predict global climate change. The findings are published in the May 26 issue of Nature.

Clouds and aerosols-small airborne particles that can become the seeds upon which clouds form-are essential to climate predictions because they reflect sunlight back into space. Reflecting light away from Earth can have a cooling effect, masking some of the warming caused by greenhouse gases.

"The best estimate is that about one-third of the warming by greenhouse gas emissions is masked by this aerosol cooling, but the fraction could be as large as half and as little as almost nothing," says Neil Donahue, professor of chemical engineering, engineering and public policy, and chemistry at Carnegie Mellon.Clouds provide clues to predict global climate change

In order to have complete climate prediction models, scientists need to incorporate clouds and aerosols into their calculations, but understanding how new aerosol particles form and grow in the atmosphere, and how they affect clouds and climate, has been challenging.

Scientists involved with CERN's CLOUD experiment study use a large chamber to simulate the atmosphere and track the formation and growth of aerosol particles and the clouds they seed. The latest research shows that new particles can form exclusively from the oxidation of molecules emitted by trees without the presence of sulfuric acid. Sulfuric acid largely arises from fossil fuels, so the new findings provide a mechanism by which nature produces particles without pollution.

"This softens the idea that there may be many more particles in the atmosphere today due to pollution than there were in 1750, and suggests that the pristine pre-industrial climate may have had whiter clouds than presently thought," says Donahue.

The team's research has lasting climate implications.

"Earth is already more than 0.8C than it was in the pre-industrial epoch, and this is with some masking by aerosol particles. As the pollution subsides, up to another 0.8C of hidden warming could emerge," says Donahue.
###
Additional research from the CLOUD collaborators, including Engineering doctoral student Wayne Chuang, identifies how nucleated particles grow over time to the point that they can seed cloud droplets and influence climate. The growth process identified by the CMU team applies to all tiny particles in the atmosphere.

To see a video of Donahue discussing these two studies, visit: <a href="https://youtu.be/cn_gjU7AiMs" target="_blank" rel="noopener noreferrer">https:/ / youtu. be/ cn_gjU7AiMs</a>

The articles can be found at: doi:10.1038/nature17953, doi:10.1038/nature18271.

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Clouds provide clues to predict global climate change

Clouds provide clues to predict global climate change. A research...

Poland starts cutting down beetle-infested trees. Authorities have started chopping down beetle-infested trees in parts of Poland's oldest forest, a move that aims to eliminate dying trees and to ensure safety for tourists, a government official said Wednesday.
The Environment Ministry's plan to fell thousands of spruce trees affected by bark beetles in the Bialowieza <a href="https://www.bing.com/search?q=forest&amp;cvid=dd9457eb831746da8f993b7b0050dfe4&amp;FORM=ANAB01&amp;PC=HCTS">Forest</a> has drawn the ire of <a href="http://www.earth.com/news/surge-in-wildfires-from-climate-change-will-increase-air-pollution/">environmental</a> groups, which argue it threatens the forest and that nature will take care of itself.
The groups have filed a protest with the European Commission, which has also expressed concern over the tree culling plan. The forest includes Europe's last primeval woodland, protected as a national park, and is on the UNESCO world heritage list. Poland starts cutting down beetle-infested trees
But Environment Minister Jan Szyszko, who took office last fall, insists his predecessors have neglected the woods and that beetle-affected, dying trees need to be removed to stop the infestation.
Ministry spokesman Jacek Krzeminski told The Associated Press that in younger parts of the woods, foresters have begun felling sick trees along tourist routes to prevent any danger to visitors. This is the very start of a larger tree culling program planned for years.
The forest covers around 60,000 hectares (148,260 acres) in eastern Poland and stretches into Belarus. It is home to hundreds of animal and plant species, including bison, lynx, moss and lichens. About 4,000 hectares (9,885 acres) are deadwood now, because of the bark beetle, Krzeminski said.
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Poland starts cutting down beetle-infested trees

Poland starts cutting down beetle-infested trees. Authorities have started chopping...

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Even small offshore oil spills put seabirds at risk. Seabirds exposed to even a dime-sized amount of oil can die of hypothermia in cold-water regions, but despite repeated requests by Environment Canada, offshore oil operators are failing when it comes to self-monitoring of small oil spills, says new research out of York University.

Chronic pollution from many small offshore oil spills may have greater population-level impacts on seabirds than a single large spill, suggest researchers Gail Fraser and Vincent Racine of York U's Faculty of Environmental Studies. However, seabirds are rarely considered in the monitoring of small spills from offshore oil production projects in Newfoundland and Labrador even though Environment Canada has asked that they be included.

In an article published in the international journal, Marine Pollution Bulletin, Fraser and Racine looked at how offshore oil operators monitored and responded to small spills (less than 1,000 litres) for three production projects off the coast of Newfoundland and Labrador.

In three high-profile environmental assessments Environment Canada repeatedly requested that impacts on seabirds be monitored following small spills, but this has not happened.

"Industry self-monitoring of spills has failed to collect information that would allow researchers to understand the impact of chronic oil spills on seabirds," said Fraser, who along with Racine is calling for independent observers on the offshore platforms. "Many seabird populations are declining and understanding sources of mortality is critical to their conservation." Even small offshore oil spills put seabirds at risk

Fraser and Racine looked at reporting and monitoring of spills between 1997 and 2010. The researchers obtained operator spill reports under an Access to Information request. They found there were 220 daytime spills. Reporting on the presence or absence of seabirds was done in only 11 (five per cent) of the cases. The Canadian Wildlife Service's seabird survey protocol should be followed when a spill occurs, but none of the reports showed evidence of that. The time it takes for a small spill to dissipate was also not in the spill reports and this information is required to estimate possible interactions of oil spilled with seabirds. "The lack of information on seabirds during oil spills indicates a need for third-party observers," said Fraser.

The joint federal and provincial Newfoundland &amp; Labrador the Canada-Newfoundland Labrador Offshore Petroleum Board (C-NLOPB) is responsible for administering environmental assessment follow-up procedures, including monitoring and responses to oil spills. The C-NLOPB has repeatedly rejected calls for independent, third party observers on platforms while seemingly being incapable of enforcing Environment Canada's recommendations.

However, during the White Rose environmental assessment process the C-NLOPB publicly acknowledged "that should such circumstances arise, it is fully prepared to adopt a different regulatory approach, including consideration of full-time on-site oversight of the operations concerned." While the circumstances were not defined, Fraser argues that "A failure to collect information on seabirds during oil spills for 13 years is sufficient to demand the regulatory approach be changed to include third-party observers."
###
*Note: High res photos available, including the following.

<a href="http://news.yorku.ca/files/Oiled-Thick-billed-Murre-Cripple-Cove-Nfld-Nov.-28-2004.-Photo-credit-Ian-L.-Jones.jpg" target="_blank" rel="noopener noreferrer">http://news. yorku. ca/ files/ Oiled-Thick-billed-Murre-Cripple-Cove-Nfld-Nov. -28-2004. -Photo-credit-Ian-L. -Jones. jpg</a>

<a href="http://news.yorku.ca/files/Oiled-Thick-billed-Murre-Cripple-Cove-near-Cape-Race-Newfoundland-November-28-2004.-Photo-by-Ian-L.-Jones.jpg" target="_blank" rel="noopener noreferrer">http://news. yorku. ca/ files/ Oiled-Thick-billed-Murre-Cripple-Cove-near-Cape-Race-Newfoundland-November-28-2004. -Photo-by-Ian-L. -Jones. jpg</a>

<a href="http://news.yorku.ca/files/Oiled-Thick-Billed-Murre-Cape-Shore-Newfoundland-4-December-2004.-Photo-by-Bill-Montevecchi.jpg" target="_blank" rel="noopener noreferrer">http://news. yorku. ca/ files/ Oiled-Thick-Billed-Murre-Cape-Shore-Newfoundland-4-December-2004. -Photo-by-Bill-Montevecchi. jpg</a>

<a href="http://news.yorku.ca/files/Oiled-Common-Murre-Cape-Shore-Newfoundland-4-December-2004.-Photo-by-Bill-Montevecchi.jpg" target="_blank" rel="noopener noreferrer">http://news. yorku. ca/ files/ Oiled-Common-Murre-Cape-Shore-Newfoundland-4-December-2004. -Photo-by-Bill-Montevecchi. jpg</a>

York University is known for championing new ways of thinking that drive teaching and research excellence. Our 52,000 students receive the education they need to create big ideas that make an impact on the world. Meaningful and sometimes unexpected careers result from cross-discipline programming, innovative course design and diverse experiential learning opportunities. York students and graduates push limits, achieve goals and find solutions to the world's most pressing social challenges, empowered by a strong community that opens minds. York U is an internationally recognized research university - our 11 faculties and 24 research centres have partnerships with 200+ leading universities worldwide.

Media Contact:

Sandra McLean, York University Media Relations, 416-736-2100 ext. 22097 / <a href="mailto:sandramc@yorku.ca">sandramc@yorku.ca</a>

</div>

Even small offshore oil spills put seabirds at risk

Even small offshore oil spills put seabirds at risk. Seabirds...

Exxon and Chevron reject climate change resolutions. Shareholders at Exxon Mobil and Chevron rejected climate change resolutions backed by environmentalists that would have pushed the companies to take stronger stands in favor of limiting climate change.
Environmentalists took solace, however, that some of their ideas gained considerable support.
At Chevron Corp., a resolution asking for an annual report each year on how climate-change policies will affect the company received 41 percent of the vote. A similar resolution at Exxon got 38 percent.
Also, Exxon Mobil Corp. shareholders voted to ask directors to adopt a proxy-access rule, which would make it easier for shareholders to propose their own board candidates. Backers including the <a href="https://www.bing.com/search?q=new+york&amp;cvid=0b568deee1ee4d528f3fc616d4b0fd3a&amp;FORM=ANAB01&amp;PC=HCTS">New York</a> City comptroller said it could result in the election of independent directors who could help the company address risks like climate change.
The meetings Wednesday - Exxon's in Dallas, Chevron's in San Ramon, California - came as the companies are trying to dig out from the collapse in crude prices that began in mid-2014. Exxon earned $16.15 billion last year, its smallest profit since 2002. Chevron's annual profit plunged 76 percent to $4.59 billion and included the company's first money-losing quarter since 2002.
Crude prices have rebounded since February, boosting the shares of the top two U.S. oil companies, but they remain about half of what they were at their last peak.
Exxon is also dealing with investigations by officials in several states into what the company knew and allegedly didn't disclose about oil's role in climate change.
The company's shareholders rejected resolutions to put a climate expert on the board and support the goal of a UN meeting in Paris last year to limit global warming to 2 degrees Celsius above pre-industrial levels. Exxon and Chevron reject climate change resolutions
Patricia Daley, a Dominican sister from New Jersey and sponsor of one of the resolutions, said Exxon lacked "moral leadership."
"Our company has chosen to disregard the consensus of the scientific community, the will of the 195 nations that signed the <a href="http://www.earth.com/news/inconsistent-paris-agreement-pledges/">Paris</a> agreement," religious leaders and even other oil companies, Daley said.
Exxon CEO Rex Tillerson said his company has long recognized that climate change is a serious risk and might require action. But, he said, any policies should be implemented evenly across the world, allow market prices to pick solutions, and be flexible enough to respond to economic ups and downs and "breakthroughs in climate science."
Exxon forecasts that oil and gas will make up 60 percent of the world's energy supply in 2040 - about the same share it holds today. Its CEO said the company was balancing the need to produce more energy for growing world demand with environmental considerations.
Tillerson said there is no alternative source that can replace the ubiquity of fossil fuels. He expressed confidence that technology will provide the key to limiting carbon emissions.
"We've got to have some technological breakthroughs," he said, "but until we achieve those, to just say turn the taps off is not acceptable to humanity," he said.
The shareholders responded with robust applause.
Across the street from the meeting hall, about 60 protesters gathered and urged large shareholders such as pension funds to divest their shares. Many held signs with slogans such as "Exxon Liar Liar Earth on Fire." The mood was sedate, however, perhaps owing to the warm, muggy weather.
Exxon shares rose 59 cents to $90.26, and Chevron shares gained $1.60 to $101.79.
---
This story has been corrected to note that the climate-change resolution won 38 percent support, instead of a maximum of 25 percent support.
© 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

Exxon and Chevron reject climate change resolutions

Exxon and Chevron reject climate change resolutions. Shareholders at Exxon...

Spring snowpack becoming more vulnerable to climate change. Spring snowpack, relied on by ski resorts and water managers throughout the Western United States, may be more vulnerable to a warming climate in coming decades, according to a new University of <a href="https://www.bing.com/search?q=utah&amp;form=EDGEAR&amp;qs=PF&amp;cvid=1afc1cfdc8b748ad86c69db28d7ec0d9&amp;cc=US&amp;setlang=en-US&amp;elv=AY3%21uAY7tbNNZGZ2yiGNjfOY30fClOq9osfcI6T5oj*hE6t5rxobamX30NRQjBmy*OP9iLS3k4wiq6hva%215doRmj9DfIWHLG9gu65Xi7ZK5Q&amp;plvar=0&amp;PC=HCTS">Utah</a> study.

The study, accepted for publication in Geophysical Research Letters, models the year-to-year variability in precipitation and temperature in Utah's Wasatch Mountains and other ranges in the West. Jason Scalzitti, a graduate student in atmospheric sciences, and professors Court Strong and Adam Kochanski found that above a threshold elevation, the amount of spring snowpack is dependent more on the amount of precipitation in a year than the temperature. In other words, whether a year is wet matters more than if it's warm. But below that threshold, temperature matters more. By the end of the century, according to the study, that threshold will move uphill by around 800 feet in the Wasatch and more in the Sierra Nevada, Cascades and parts of the Rocky Mountains.

"In the past we've thought mainly about total precipitation as an indicator of how good the ski season's going to be," says Strong. "As we move into the future, especially at elevations below the threshold, temperature increases in importance." Spring snowpack becoming more vulnerable to climate change

Zooming in on the Wasatch

Strong and his colleagues based their work on a high-resolution, regional-scale climate model called the Weather Research and Forecasting (WRF) model. Conventional climate models make calculations on grids 62 miles (100 km) on a side. For reference, less than 20 miles separate Salt Lake City, west of the Wasatch, and Park City, Utah, on the east. "You can't even see the Wasatch Range at that resolution," Strong says. Although the coarser grid of global climate models works well in flat topography, such as the <a href="http://www.earth.com/news/great-plains-rain-plow/">Great Plains</a>, the complex terrain of the Intermountain West requires a finer resolution.

The researchers employed a technique called "dynamical downscaling," telescoping the model grid into smaller and smaller grid cells in order to capture fine-scale atmospheric processes affecting local climate. In the team's final simulations, the Wasatch Range was modeled at a resolution of about 2.5 miles (4 km) to realistically capture impacts of the range's slopes, canyons, and peaks on the local precipitation pattern. They further accounted for future temperature changes in the Great Salt Lake and evaporation from urban irrigation, both of which contribute moisture to the air. The team projected regional future climate forward to the year 2100 using a business-as-usual carbon emissions scenario that assumes greenhouse gas emissions will continue to increase at the same rate as today.

Crossing the threshold

They found that at high elevations, temperatures remain cold enough throughout the spring to turn precipitation to snow and to keep the snow on the ground from melting. Amount of precipitation is the main factor determining how much snow is on the ground during the critical spring months. Going down toward the valley floors, however, temperatures rise, and even in years with high precipitation, the slopes experience more rain and more melting. Temperature becomes the primary driver of the depth of spring snowpack.

The threshold elevation between precipitation-controlled and temperature-controlled snowpack, currently sits at about 6500 feet (1980 meters) in the Wasatch, near the base elevation of the ski resorts in Park City. In future projections, however, the threshold elevation rises to 7300 feet (2230 meters).

In the simulations, modeled threshold elevations rose in mountain ranges all over the West - by about 800 feet (250 meters) in Colorado's Rockies, about 980 feet (300 meters) in California's Sierra Nevada and Washington's Cascades and more than 1400 feet (432 meters) in the middle Rockies of Idaho and Wyoming.

Impacts in peaks and valleys

Four Wasatch ski resorts, Solitude, Snowbird, Alta, and Brighton, sit well above the end-of-century 7300 foot threshold. But the rest, including venues from the 2002 Winter Olympics, sit at base elevations between 5500 and 7200 feet. The peak elevations of all resorts except one, Nordic Valley, extend up above the 7300 foot future threshold.

An overall warming trend doesn't mean that every year will be a bad year for low-elevation resorts. But below the threshold elevation, resorts will more susceptible to warm years. "Let's say we get the same amount of storms every year," says study co-author Kochanski. "Above the threshold, the resorts will probably be fine. For the others, even if we have the same precipitation, they may be in trouble because they could get more rain instead of snow, and the snowpack will diminish faster."

Although impacts to ski resorts could affect Utah's economy, another implication of diminished snowpack affects nearly all Utahns - shrinking water resources. Melting spring snowpack fills reservoirs, providing water for the residents of the Salt Lake Valley. Spring snowpack amounts are a key indicator for water managers of how much water they'll have available in reservoirs for the coming year.

"They look at that as how much water is available in the form of snow to melt and capture in the reservoirs," Strong says. "That will be down in the future. Even if we have the same amount of water coming into the system, it will be melting earlier and faster. If we want to supply that to a growing population, then we need increased storage capacity."

Strong and Kochanski say they can now use their model as a framework to continue exploring questions about future climate and snowpack variation, both by exploring the impacts of different carbon emissions scenarios and by looking at mountain ranges around the world, such as the Himalayas.
###
This work was funded by the National Science Foundation.

This release and accompanying images are available at <a href="http://unews.utah.edu/spring-snow-a-no-go/" target="_blank" rel="noopener noreferrer">http://unews. utah. edu/ spring-snow-a-no-go/ </a>

The full study, which has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, can be found here: <a href="http://onlinelibrary.wiley.com/doi/10.1002/2016GL068798/full" target="_blank" rel="noopener noreferrer">http://onlinelibrary. wiley. com/ doi/ 10. 1002/ 2016GL068798/ full</a>

Spring snowpack becoming more vulnerable to climate change

Spring snowpack becoming more vulnerable to climate change. Spring snowpack,...

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Study examines the drought vulnerability of maize and wheat. Researchers led by Lixin Wang, assistant professor of earth sciences in the School of Science at <a href="http://www.earth.com/news/indiana-jones-search-lost-ark/">Indiana</a> University-Purdue University Indianapolis, have identified critical information about the environmental variables and agronomic factors that determine the drought vulnerability of maize and wheat production.

The study, "Global Synthesis of Drought Effects on Maize and Wheat Production," was published today in the journal PLOS ONE.Study examines the drought vulnerability of maize and wheat

"Our food source depends heavily on cereals, yet their agricultural production is greatly affected by drought," Wang said. "Ultimately, this information can be used to guide agricultural planning and minimize crop loss due to drought."

Together, maize and wheat contributed more than 50 percent of global cereal production in 2013, or equal to about 1,016 and 713 million tons of grain production, respectively. These numbers need to be increased by 60 percent to 110 percent by 2050 to meet the increasing needs of humans and meat- and dairy-producing animals, as well as the biofuel industry, according to statistics cited by the researchers.

But with droughts projected to intensify in most parts of Asia and beyond, it is more important than ever to fully understand how drought affects the vulnerability of maize and wheat production, in combination with other factors such as the life cycle of the cereals and soil texture, according to Wang.

Using a data-synthesis approach, the researchers collected data from peer-reviewed publications dated between 1980 and 2015 that examined maize and wheat yield responses to drought.

Based on the meta-analysis of all of the available literature data, the study results show that maize and wheat have a significantly different yield response to drought.

"Overall, we found that maize tended to experience greater yield loss due to drought, partly because maize originated from a wetter region," Wang said.

According to the study, wheat has a lower yield reduction, 20.6 percent, compared to 39.3 percent for maize at approximately 40 percent water reduction.

Maize is also highly sensitive during its reproductive phase, the researchers found. Although wheat has similar sensitivity to drought during vegetative and reproductive phases, it is considerably lower than that of maize.

The higher yield reduction in response to drought in maize is surprising, given that plants with C4 photosynthetic pathways (e.g., maize) usually have higher water-use efficiency than C3 plants (e.g., wheat) and therefore are considered less sensitive to drought due to their ability to efficiently make use of carbon dioxide and water. Higher sensitivity during the reproductive phase for maize could contribute to these unexpected results, Wang said.

Another finding was that maize is equally sensitive to drought in dryland and non-dryland regions. While no yield difference was observed among regions or in different soil texture, it was found that wheat cultivation in dryland regions is more prone to yield loss than in the non-dryland regions.

The study's results may be used as the basis to model the interactions between agronomic inputs, to quantify productivity gains and production costs for maize and wheat, and to determine optimum irrigation scheduling during critical growth periods, Wang said.

The lead author of this research is Stefani Daryanto, a postdoctoral researcher working with Wang. The other author of the paper is Pierre-Andre Jacinthe, an earth sciences associate professor in the School of Science at IUPUI.


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Study examines the drought vulnerability of maize and wheat

Study examines the drought vulnerability of maize and wheat. Researchers...

Summer forecast: Well above average temperatures. Most of the continental United States is facing elevated chances of well above average temperatures this summer, according to the <a id="anch_49" href="http://www.cpc.ncep.noaa.gov/products/predictions/long_range/fxus05.html" target="_blank" rel="noopener noreferrer">latest outlook</a> from NOAA’s Climate Prediction Center.

Colored areas on the map at right show which parts of the country have the highest odds (darkest red) for well above average warmth for the June-August period. For the seasonal forecasts, “well above average” means temperatures in the warmest third of all summers in the current climatological record (1981-2010). (Larger versions as well as precipitation maps are available via links below image to the right. A separate forecast discussion for Hawaii is available <a id="anch_50" href="https://www.google.com/url?q=http://www.cpc.ncep.noaa.gov/products/predictions/long_range/fxhw40.html">here</a>.)

Nationwide, Alaska’s Aleutian <a href="http://www.earth.com/news/nutrients-in-seabird-poop-transformed-the-falkland-islands/">Islands</a> have the highest chances of an unusually warm summer, with probabilities between 60-70 percent. For the contiguous United States (i.e, the “Lower 48”), the chances for top-tier warmth are greatest in the West and the Northeast (50-60 percent), and smallest in the heart of the Great Plains, where the odds of well above average temperatures are the same as the odds of near-average or well below average temperatures (33 percent each). Summer forecast: Well above average temperatures

(For math fans, a more detailed discussion of forecast probabilities is available at the end of the post.)

Darker colors mean greater chances of a hot summer, not how much hotter it’s projected to be. In other words, we’re not predicting that summer temperatures in Maine will be farther above average than temperatures in Florida; we’re predicting that the chances for an unusually hot summer are greater in Maine than they are in Florida.

Although the tropical Pacific appears to be in the middle of a transition between El Niño and La Niña, neither phase of <a id="anch_51" href="https://www.climate.gov/enso">ENSO</a> has a significant influence on summer climate. Instead, the summer outlook is more influenced by short- and long-term ocean and atmospheric trends as well as mid-latitude sea surface temperatures in the Pacific and Atlantic Oceans.

For public health and welfare agencies or employers with outdoor laborers, summer temperature outlooks can provide advance warning of an elevated risk of dangerous summer heat. As part of the interagency <a id="anch_52" href="https://toolkit.climate.gov/nihhis">National Integrated Heat Health Information System</a> (NIHHIS), NOAA the CDC, and many other partners are providing quick online access to temperature outlooks and other heat health information and tools.  <a id="anch_53" href="http://toolkit.climate.gov/nihhis">NIHHIS</a> is built on the <a id="anch_54" href="https://toolkit.climate.gov/">U.S. Climate Resilience Toolkit</a>, an interagency website devoted to helping U.S. communities and businesses become more resilient to climate variability and change.
<h3>Fun for math fans</h3>
NOAA’s seasonal forecasts start with the assumption that for any random summer or winter, there are three possible climate outcomes--temperature or precipitation that is well above normal (upper third of the climatological record), near normal (middle third), or below normal (lower third)--and they are each equally likely. Together, all probabilities must add up to 100%, so the “default” probability for each outcome is 33.3%.

The goal of the forecast is to estimate how the actual conditions in the weeks or months before the season--like the presence of El Niño--tilt the odds toward or away from “equal chances” for all categories. If models predict that the chances of well above average temperatures are 60%, then the chances for the other two outcomes (near-average and well below average temperatures) must be split between the remaining 40% (100-60=40).

How do we divvy up the remaining fraction? Physically speaking, it makes sense to say that if the odds have tilted toward one climate outcome (say, unusual warmth) by a given amount, they’ve tilted away from the opposite outcome by an equal amount. So, by convention, forecasters divvy up the remaining fraction by holding the chances for near-normal conditions at the “default” 33.3%, and subtracting it from the remainder. What’s left (6.7%) is the probability of the least favored category.

When the odds of one climate outcome are so high (70 percent or more) that the remaining fraction is smaller than 33.3 percent, forecasters set a minimum 3.3 percent chance for the opposite outcome, and give the larger portion of the remainder to the near-normal outcome. (Otherwise, the least favored category would wind up with a negative probability, which doesn’t make mathematical or physical sense.) The Climate Prediction Center <a id="anch_55" href="http://www.cpc.ncep.noaa.gov/products/predictions/multi_season/13_seasonal_outlooks/color/shortlegend.gif">has a chart </a>showing all the possible combinations, and <a id="anch_56" href="http://www.cpc.ncep.noaa.gov/products/predictions/long_range/seasonal_info.php">their own description</a> of the forecast format.

Since only one color can be assigned to any location on the map, the most favored category decides the color, but the other categories are still possible. So, in this summer’s season outlook for the Northeast and the West Coast, for example, the full suite of probabilities is 50-60% chance of well above normal temperatures, 33.3% chance of near-normal temperatures, and 6.7-16.7% chance of well below normal temperatures.

Maps by NOAA Climate.gov team, based on data from the Climate Prediction Center. Monthly outlook maps in a variety of re-usable formats are available via the<a id="anch_57" href="http://www.climate.gov/maps-data/data-snapshots/start"> Data Snapshots</a> section of Climate.gov.

Summer forecast: Well above average temperatures

Summer forecast: Well above average temperatures. Most of the continental...

Scientists are transforming chocolate into a functional food by infusing it with probiotics and prebiotics, aiming to create a treat that satisfies cravings while supporting gut health. 



The challenge lies in maintaining chocolate's beloved texture and flavor while adding health benefits.



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https://youtu.be/Ug657J67iEo?si=w96YjGMsg939LD_3
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Probiotics - beneficial microbes that balance gut bacteria and aid digestion - are typically fragile and can be destroyed by stomach acid or processing. 



Prebiotics act as food for these microbes, helping them thrive. Together, they form "synbiotics," a powerful health combination.



Researchers Smriti Gaur and Shubhi Singh from India's Jaypee Institute of Information Technology took an innovative approach, using natural prebiotics like corn and honey instead of complex processing methods. 



They created five chocolate varieties: a control and four synbiotic versions containing different combinations of prebiotics, probiotics (Lactobacillus strains), and flavor enhancers (cinnamon or orange).



Laboratory simulations of human digestion showed the probiotics remained viable for over five hours, suggesting they could survive long enough to benefit gut health.



Taste tests were positive, with researchers particularly enjoying the orange-flavored variety, describing it as having "vibrant citrus notes" complementing the "rich cocoa" with a "luxurious" texture.



This research represents just the beginning. With further refinement of strains, textures, and flavors, chocolate could evolve beyond mere indulgence to become a functional food that nourishes while it delights.



The study is published in the journal <a href="https://pubs.acs.org/doi/10.1021/acsfoodscitech.4c00741" target="_blank" rel="noreferrer noopener">ACS Food Science &amp; Technology</a>.

Is chocolate the next nutritional powerhouse?

Scientists are transforming chocolate into a functional food by infusing...

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



---



By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Designing crops that can beat the heat

[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"] Today’s Video of the Day from Carl...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes the first comprehensive estimate of carbon density in the Saharan, Sahel, and Sudanian zones of Africa. In an effort to measure the amount of carbon stored across these drylands, a team of scientists used high-resolution satellite images and artificial intelligence to map nearly 10 billion individual trees. 



"The high spatial resolution (50 cm) combined with AI and field measurements used in this study is key to improving tree inventories in drylands," said Pierre Hiernaux, a French researcher working for NASA. "The ever-increasing availability of very high-resolution satellite imagery will make it possible to assess carbon pools and their dynamics at the individual tree level on a global scale."



"This study is exceptional because it is pioneering a type of approach that will revolutionize the monitoring of trees and forests on a global scale: in the short term, it will be possible to map the world's trees from the centre of the Amazon to our schoolyards," said <a href="https://www.inrae.fr/en">INRAE</a> researcher Jean-Pierre Wigneron.



"Many fields of application will become much more efficient and accurate, such as tracking carbon stocks, biodiversity, monitoring logging and protection against illegal forest degradation, in near real time.”



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Remote sensing will revolutionize the way we monitor trees

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Lesotho: Africa's "Kingdom in the Sky" Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features northwest Lesotho in South Africa.



According to ESA, Lesotho is the only nation in the world that lies completely above 1,000 m in elevation. The country is famous for its tall mountains and narrow valleys, and is known as Africa's "Kingdom in the Sky."



Out of a population of around two million people, about 80 percent live in rural areas. More than 75 percent of these people are engaged in <a href="https://www.earth.com/news/climate-change-will-have-a-global-impact-on-agriculture/">agriculture</a>, including rainfed cereal production and animal grazing.&nbsp;



ESA reports that the country’s agricultural system faces a growing number of issues, with climate-related vulnerabilities such as drought, floods and extreme temperatures occurring more frequently. 



Diamonds are amongst the minerals found in the mountains. Indeed, Lesotho can truly be called the Kingdom in the Sky. Beautiful, culturally rich, safe, affordable, and easily accessible from Durban and Johannesburg, mountainous Lesotho is a vastly underrated travel destination. the Kingdom of Lesotho (Sotho: 'Muso oa Lesotho) is an enclaved country in southern Africa. It is just over 30,000 km2 (11,583 sq mi) in size and has a population of around 2 million.



Video Credit: ESA&nbsp;&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 



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Lesotho: Africa's "Kingdom in the Sky"

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> features a visual dataset of.methane emissions from wetlands across the globe. Atmospheric methane levels have reached record highs in recent years, and wetlands are a major source of these emissions.&nbsp;



"Methane is an important greenhouse gas that contributes substantially to global warming. On a molecule by molecule basis, methane is much more efficient at trapping heat than carbon dioxide, the main driver of warming," says NASA.



"Though human activities, including agriculture, oil and natural gas production and use, and waste disposal, collectively contribute the majority of methane to the atmosphere, about a third of total methane emissions comes from wetlands."&nbsp;



According to NASA, understanding methane emissions from wetlands and other natural sources is critically important for scientists and policymakers who are working to combat climate change by reducing emissions from human activities.



Video Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Wetlands are a major source of methane emissions

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The rapid retreat of the Columbia Glacier

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes how record-breaking heat expressed itself around the world in 2022.



Scientists have determined that 2022 was the 5th warmest year since 1880. Furthermore, the last nine consecutive years have been the warmest on record.



From devastating floods and wildfires to natural disasters like Hurricane Ian, 2022 showed us yet again how a warming climate affects people across the globe.&nbsp;



"As we look back at 20:22 and years past, we see that each year we better understand the challenges we face and how important it is to meet them," says NASA.



Video/ Image Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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2022 illustrated the consequences of a warming climate

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> is focused on the melt ponds that emerge during the spring and summer on the Greenland Ice Sheet, which is the largest ice mass in the northern hemisphere.



"Melt ponds are vast pools of open water that form on both sea ice and ice sheets and are visible as turquoise-blue pools of water in this Copernicus Sentinel-2 image," says ESA.



"When snow and ice melts atop glaciers, water flows in channels and streams and collects in depressions on the surface. These melt ponds can speed up the melting of the surrounding ice since they greatly reduce the ice’s ability to reflect sunlight."



"This can create a positive feedback where an increasing number of melt ponds absorb more heat which causes ice cover to melt even faster."



According to ESA, Greenland has been hit with a late-season heatwave that began in early September. This caused the type of melt event that usually occurs in the middle of summer.



"In a recent paper published in Nature Climate Change, scientists found that major sea-level rise from the melting of the Greenland ice cap is now ‘inevitable’ even if the burning of fossil fuels were to halt overnight," says ESA. "Using satellite observations of Greenland ice loss and ice cap from 2000 to 2019, the team found the losses will lead to a minimum rise of 27 cm regardless of climate change."



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Melt ponds on the Greenland Ice Sheet

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes how Earth is unique in our solar system for its ability to sustain liquid water on its surface. But now, the water cycle is shifting as the climate warms, and scientists must find ways to predict how these changes will affect water availability.



Overall, 96 percent of Earth's water is saltwater, and nearly all of freshwater is found in ice and groundwater. These sources of water are linked as it passes through solid, liquid and gas phases.



In a warmer climate, the water cycle will be transformed. It will be easier for water to evaporate and form clouds, and storms will become more frequent and intense. Some regions will get too much water, while others will be left without enough water. In addition, soil moisture will be lost - which threatens food security.



Scientists are using satellite data from over the last 40 years to track changes that are happening in the water cycle. This will ultimately help us prepare for extreme events and better manage our water resources, according to ESA.



Video Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Tracking changes in Earth's water cycle

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard Space Flight Center</a> features images of Saturn from NASA’s Hubble Space Telescope. The photographs capture the start of the mysterious "spoke season" on Saturn - when unexplained features appear on its rings. 



According to NASA, both the cause of the spokes and their seasonal variability have yet to be fully explained by planetary scientists.



"Like Earth, Saturn is tilted on its axis and therefore has four seasons, though because of Saturn's much larger orbit, each season lasts approximately seven Earth years. Equinox occurs when the rings are tilted edge-on to the Sun," explains NASA.



"The spokes disappear when it is near summer or winter solstice on Saturn. (When the Sun appears to reach either its highest or lowest latitude in the northern or southern hemisphere of a planet.) As the autumnal equinox of Saturn's northern hemisphere on May 6, 2025, draws near, the spokes are expected to become increasingly prominent and observable."



Experts believe that the spokes may be a product of the planet's variable magnetic field. When magnetic fields interact with solar wind, an electrically charged environment is created. This phenomenon is visible on Earth as the northern lights.&nbsp;



"Scientists think that the smallest, dust-sized icy ring particles can become charged as well, which temporarily levitates those particles above the rest of the larger icy particles and boulders in the rings," says NASA.



The spokes were first observed in the early 1980s by NASA's Voyager mission. Depending on the angle of the rings, the spokes can appear dark or light.



"Thanks to Hubble's OPAL program, which is building an archive of data on the outer solar system planets, we will have longer dedicated time to study Saturn’s spokes this season than ever before," said NASA senior planetary scientist Amy Simon, head of the Hubble Outer Planet Atmospheres Legacy (OPAL) program.



"Despite years of excellent observations by the Cassini mission, the precise beginning and duration of the spoke season is still unpredictable, rather like predicting the first storm during hurricane season."



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Mysterious "spoke season" captured on Saturn

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Today’s Video of the Day from <a href="http://www.ntu.edu.sg/">NTU Singapore</a> reveals that some plants can remove toxic heavy metals from soil.&nbsp;



The researchers analyzed samples of various tropical plant species to test for levels of heavy metals and metalloids. The study showed that there are existing plants with high levels of these contaminants, which means that these species are great candidates for drawing pollutants out of the soil.&nbsp;



Among the plants examined in the study, 12 species had accumulated several types of heavy metals and metalloids. These plants are widely available, including species that are native to Singapore.



“In a small nation like Singapore, land may be repurposed to support new development plans, so it is important that we have a green and sustainable way to remediate land that is contaminated," said Professor Lam Yeng Ming.



"We set out to uncover how to better make use of tropical plants to do phytoremediation and through advanced characterization techniques, we showed how some of these tropical plant species can be an environmentally friendly and literally a 'green' way to remove contaminants in soil."&nbsp;



"Phytoremediation also has benefits of cost effectiveness, simplicity of management, aesthetic advantages, and long-term applicability and sustainability. The strategy prevents erosion and metal leaching by stabilizing or accumulating heavy metals, so that helps reduce the risk of contaminant spread.”



Video Credit: NTU Singapore



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Plants help remove heavy metals from contaminated soil

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes why herbicides are not as effective in killing weeds anymore. In the 20th century, chemical companies developed thousands of herbicides. The most commonly used herbicide was glyphosate, which was introduced in 1974.



Over the past few decades, dozens of species of weeds have evolved resistance to glyphosate. Depending on the site of action, the part of the plant that an herbicide interacts with, weeds may even be resistant to herbicides that have not been developed yet.&nbsp;



With increasing resistance to glyphosate and other herbicides, weeds are - once again - becoming a major concern for farmers.&nbsp;



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Weeds are becoming increasingly resistant to herbicides

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Today’s Video of the Day from the <a href="https://www.jpl.nasa.gov/">NASA Jet Propulsion Laboratory</a> (JPL) describes a dust storm on Mars that was nearly twice the size of the United States. As the storm covered the southern hemisphere of the planet, some of NASA’s explorers had to delay their normal activities.



NASA’s Insight lander put itself in a "safe mode" for 11 days to conserve battery power because solar power was disrupted by the dust. The Ingenuity Mars Helicopter postponed flights until conditions improved.



"A fleet of NASA orbiters monitor Martian dust storms like this one and serve as lifelines to Earth by relaying data from the rovers and lander on the ground back to the team. This includes the Mars Reconnaissance Orbiter, MAVEN, and Odyssey," reports JPL.



"Dust storms like this recent one start close to the ground and are spread by wind as they rise – warming the cold Martian atmosphere."



The images in the video were captured by NASA’s Curiosity as the dust rolled in. A fleet of orbiters monitored the dust storm from above, relaying data from Mars’ explorers back to scientists on Earth.



Video &amp; Image Credit: NASA/JPL-Caltech/ASU/MSSS



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NASA monitors giant dust storms on Mars

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Today's Video of the Day from the <a href="http://www.esa.int/">European Space Agency</a> features Qeshm Island in the Strait of Hormuz. This strait provides the only sea passage from the Persian Gulf to the open ocean.



Qeshm is separated from the Iranian coast by the Clarence Strait, also known as Khuran.&nbsp;The Hara Forest Protected Area is a network of shallow waterways and forest located between the island and the mainland. This protected region is home to sea turtles, snakes, and more than 150 species of migrating birds.



Qeshm is famous for its wide range of&nbsp;ecotourist&nbsp;attractions, such as the&nbsp;Hara marine forests. According to environmentalists, about 1.5 percent of the world birds and 25 percent of Iran's native <a href="https://www.earth.com/news/female-hummingbirds-avoid-sexual-harassment-by-looking-like-males/">birds</a> annually migrate to the forests, which are the first national geo park in Iran.



Tourists are also drawn to the island to see an age-old Portuguese&nbsp;fort, historic mosques, the&nbsp;Seyyed Mozaffar&nbsp;and&nbsp;Bibi Maryam&nbsp;shrines, and the "Valley of Stars."



The average temperature on the island is 81 degress and the region is often hot and humid. From June to August, the island is described as being oppressively hot. The ideal time to visit is during the winter season. 



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Qeshm Island in the Strait of Hormuz

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Inhambane Bay in southeast Mozambique.&nbsp;



"Inhambane Bay is a deep inlet into which the small Mutamba River flows," says ESA. "On one side of the bay lies the historical city of Inhambane, capital of the Inhambane Province, while the sister city of Maxixe, the economic capital of Inhambane, sits across from it. The province is the second largest grower of cashews, after Nampula, and it also produces coconut and citrus fruits."



The beaches of Barra and Tofo are popular with tourists. There are also coral reefs along the long coastline of Inhambane, making it an ideal destination for scuba diving and snorkeling.



"Mozambique’s extensive coastline heightens the country’s vulnerability to tropical cyclones that develop in the Indian Ocean as well as storm surge flooding," says ESA.



"More than half of the population lives in low lying coastal areas, putting communities at risk. Inhambane Bay was dangerously close to where Cyclone Idai made landfall in 2019 causing widespread destruction to the country."



Video/ Image Credit: ESA



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Inhambane Bay in southeast Mozambique

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency </a>&nbsp;features the Kangerlussuaq Glacier, one of the largest tidewater outlet glaciers in Greenland. The glacier is located on the east coast of the Greenland ice sheet.



As human-induced climate change continues to drive up temperatures, global ice loss is accelerating at an alarming rate. ESA reports that, over the past decade alone, 3.5 trillion tons of ice have melted from the Greenland ice sheet. This is enough to cover the UK with meltwater 15 meters deep.



Based on satellite imagery, researchers determined that Kangerlussuaq entered a new phase of rapid retreat and acceleration in 2017. In their study, published in <a href="https://www.frontiersin.org/articles/10.3389/feart.2019.00123/full">Frontiers in Earth Science</a>,&nbsp; the experts report that the glacier's ice front is now at its most retreated position since the early 20th century.



"Given Kangerlussuaq’s previous impacts on both the magnitude and pattern of ice sheet wide mass loss, we predict that its new phase of retreat, acceleration and thinning will markedly enhance the south-east region’s contribution to increasing discharge from the ice sheet," wrote the study authors.&nbsp;&nbsp;



"More broadly, accurate forecasting of the ice sheet’s contribution to sea level rise will require a deeper understanding of, and responses to, these non-linear ice dynamic processes."



Video Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Kangerlussuaq Glacier on the Greenland ice sheet

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes the complex relationship between ocean and climate. ESA's Climate Change Initiative will help us understand how oceans influence the climate and how climate change is impacting the oceans.&nbsp;



"Earth’s oceans are huge heat stores, soaking up 93% of the excess heat from human activity over the past 70 years. Ocean currents redistribute heat around the planet, from the Equator to the poles. Where this ocean heat goes influences weather patterns and regional climate," explains ESA.



"As well as absorbing heat, oceans are a natural carbon sink, absorbing a quarter of carbon dioxide emissions from human activity. This has led to the acidification of ocean water, threating marine life."



The amount of heat and carbon dioxide soaked up by the ocean depends on specific variables, including phytoplankton, temperatures, waves, salinity, and ice cover. Satellites can be used to measure these variables from space.



"From their unique vantage point, satellites provide key information for understanding the complexities of our planet and monitoring environmental issues," says ESA.



Video Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Ocean heat influences regional climate

[sendtonews key="uwirCufwYv-2012371-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes the importance of monitoring the shape of the sea surface, which is constantly changing. These observations have many applications, such as ship routing, <a href="https://www.earth.com/news/the-modem-ocean-is-a-tough-place-for-whales-to-survive/">ocean</a> current forecasting, and debris tracking.



"A project supported by the Discovery element of ESA’s Basic Activities recently investigated a new technique to measure sea surface topography very precisely," reports ESA.



"The technique involves looking at satellite navigation (GNSS) signals that have been reflected off of the sea surface at very low angles. At these so-called grazing angles, waves and surface roughness have very little impact on the reflection process; the sea surface acts as a very smooth mirror."



Estel Cardellach is the principal investigator at the Institute for Space Studies of Catalonia, who first submitted the idea for the project.



“In a mirror-like reflection the phase of the signal can be tracked – it is continuous," said Cardellach. "Different surface heights result in different phase measurements. It gives a very precise measurement of the surface altitude at a few centimetres’ precision.”



The researchers developed a GNSS receiver and set up an experiment in the Balaeric Islands to collect signals from the receiver that were reflected off the sea surface. Ultimately, these signals will provide improved measurements of the shape of the sea surface.



Image/ Video Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Monitoring the dynamic shape of the sea surface

[sendtonews key="JrMLDXHmjl-1911953-12187" type="single"] Today’s Video of the Day from the...

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