Cloud,Dust,Of,Tree

Spring is a time for blossoms and hay we often associate pollen with allergic reactions -- a cause of sniffles and sneezes. But who would've guessed that tiny pollen spores wield such power over clouds and the overall weather?



It turns out pollen plays a vital role in facilitating the freezing of water in clouds, inciting more precipitation and cloud ice.



<h2 class="wp-block-heading" id="h-pollen-more-than-meets-the-eye">Pollen: More than meets the eye</h2>



Dr. Jan Kretzschmar, meteorologist and lead author of the study from Leipzig University, alongside co-author Professor Johannes Quaas, Professor of Theoretical Meteorology at Leipzig, decided to take a <a href="https://www.earth.com/news/pollen-can-actually-change-the-weather/" target="_blank" rel="noreferrer noopener">closer look</a> at how pollen impacts the weather.



Apparently, pollen enhances ice formation in clouds, even at temperatures between minus 15 and minus 25 degrees Celsius (5°F to -13°F). 



Without these ice-nucleating particles (INPs), water in clouds only freezes at temperatures below minus 38 degrees Celsius (-36°F).



“This is supported by laboratory results showing that pollen acts as an ice nucleus, influencing the freezing temperature of water in clouds and promoting precipitation,” says Dr. Kretzschmar.



<h2 class="wp-block-heading" id="h-pollen-clouds-and-weather-patterns">Pollen, clouds and weather patterns</h2>



Globally, pollen's effect on ice formation might not seem substantial compared to other substances like dust. However, on a regional and seasonal level, pollen's power <a href="https://www.earth.com/news/crops-worldwide-are-insufficiently-pollinated/" target="_blank" rel="noreferrer noopener">becomes evident</a>. 



We usually experience the pollen onslaught in the spring. Not only do these particles trigger our allergies, but they also rise into the atmosphere, entering cold air layers and stimulating ice formation.



Our tiny hero, pollen, doesn't stay up there for long. Its size restricts it to a short atmospheric tenure. But here's the plot twist: when pollen comes in contact with humid conditions, it ruptures into smaller fragments.&nbsp;



These minute particles stick around longer in the air and in large quantities, can penetrate cold atmospheric layers, triggering ice formation.



<h2 class="wp-block-heading" id="h-pollen-s-influence-on-clouds">Pollen's influence on clouds</h2>



Understanding how pollen impacts weather requires delving into its unique properties and interaction with <a href="https://www.earth.com/news/climate-records-shatter-2024-set-to-be-hottest-year-ever/" target="_blank" rel="noreferrer noopener">atmospheric conditions</a>.&nbsp;



Pollen grains possess a rough surface and can absorb moisture, making them remarkably effective as ice-nucleating particles, particularly in certain environmental conditions. 



This quality is essential in the phase transition of water from liquid to solid, as the presence of such particles lowers the energy barrier for freezing. 



Through this process, pollen effectively accelerates the formation of ice crystals within clouds, an initiation crucial for precipitation development.&nbsp;



Consequently, pollen's interaction with existing cloud constituents helps propagate more extensive <a href="https://www.earth.com/news/how-changing-rainfall-patterns-impact-plants-worldwide/" target="_blank" rel="noreferrer noopener">precipitation patterns</a>, making it a pivotal factor in local meteorology during peak pollen periods.



<h2 class="wp-block-heading" id="h-implications-for-climate-models-nbsp">Implications for climate models&nbsp;</h2>



The revelation that pollen contributes significantly to cloud microphysics presents challenges and opportunities for <a href="https://www.earth.com/news/rainfall-is-increasingly-unpredictable-due-to-climate-change/" target="_blank" rel="noreferrer noopener">atmospheric science</a>. 



Current climate models predominantly factor in major ice-nucleating agents like dust or soot, often overlooking the transient yet potent influence of pollen. 



Integrating pollen dynamics into these models can enhance predictive accuracy, especially in regions with prolific plant life. 



Future research is expected to focus on quantifying pollen's variability in different ecosystems, investigating its contribution to cloud dynamics, and exploring how changes in vegetation and <a href="https://www.earth.com/news/2024-is-expected-to-exceed-the-1-5c-warming-limit/" target="_blank" rel="noreferrer noopener">climate</a> might alter its role.&nbsp;



By refining our understanding of pollen's multifaceted impact on the atmosphere, scientists can develop more comprehensive climate models that better capture the intricate interplay between terrestrial biosystems and <a href="https://www.earth.com/news/extreme-rainfall-gets-an-unpredictable-boost-from-air-pollution/" target="_blank" rel="noreferrer noopener">atmospheric processes</a>.



<h2 class="wp-block-heading" id="h-pollen-s-role-in-a-changing-weather">Pollen's role in a changing weather</h2>



Now, let's take a dip into the pool of climate change. With the onset of the pollen season shifting, extending, and the volumes of pollen in the air increasing, we might be looking at heightened <a href="https://www.earth.com/news/cities-experience-more-rainfall-than-surrounding-areas/" target="_blank" rel="noreferrer noopener">local precipitation</a>.



Biodiversity is another piece of the puzzle. In spring, numerous plant species let loose volumes of pollen simultaneously. This natural event impacts cloud formation and the amount of ice particles in the atmosphere.&nbsp;



How vast is this impact? That's what scientists are keen to figure out. Understanding pollen's role could help generate more accurate climate models.&nbsp;



If we can correctly simulate the effect of pollen and how it interacts with the climate, we will be able to make more accurate predictions.



<h2 class="wp-block-heading" id="h-pollen-an-important-factor-in-cloud-formation-nbsp">Pollen, an important factor in cloud formation&nbsp;</h2>



So, can we consider pollen as an unsuspecting player in our planet's weather system? Perhaps. The upcoming research results are eagerly awaited. 



You might have started reading this article thinking pollen was just a trivial plant byproduct. But now, doesn't it feel like there is more to the story?



Remember, every time you sneeze this spring season, there's more going on than just a minor allergy. You might just be witnessing a phenomenon that could change our understanding of the weather.



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This research was carried out by researchers from <a href="https://www.uni-leipzig.de" target="_blank" rel="noreferrer noopener">Leipzig University</a>, the Leibniz Institute for Tropospheric Research (<a href="https://www.tropos.de/en/" target="_blank" rel="noreferrer noopener">TROPOS</a>), the German Centre for Integrative Biodiversity Research (<a href="https://www.idiv.de/en/index.html" target="_blank" rel="noreferrer noopener">iDiv</a>) Halle-Jena-Leipzig and the <a href="https://www.bgc-jena.mpg.de/en" target="_blank" rel="noreferrer noopener">Max Planck Institute for Biogeochemistry</a>. It's astounding what everyday things can teach us.



The study is published in the journal&nbsp;<a href="https://iopscience.iop.org/article/10.1088/1748-9326/ad747a" target="_blank" rel="noreferrer noopener">Environmental Research Letters</a>.&nbsp;



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Pollen alters cloud formation and changes weather patterns

Spring is a time for blossoms and hay we often associate pollen with allergic reactions -- a cause of sniffles and sneezes. But who would've guessed that tiny pollen spores wield such power over clouds and the overall weather? It turns out pollen plays a vital role in facilitating the freezing of water in clouds, inciting more precipitation and cloud ice. Pollen: More than meets the eye Dr. Jan Kretzschmar, meteorologist and lead author of the study from Leipzig University, alongside co-author Professor Johannes Quaas, Professor of...

Fall leaf colors are not a simple matter as scientists examine sometimes contradictory causes.

Many people consider autumn to be their favorite time of the year: crisp air, new school supplies, and pumpkin spice lattes. However, the most significant natural feature of the fall season is the changing face of our trees, whose leaves become a riot of red, yellow and orange before they eventually die and fall to the forest ground.  

This spectacle is observed by millions worldwide, particularly in the USA. People take pleasure in the changing landscape, enjoying drives in the mountains, hikes and even watch "leaf cams” online. Autumn leaves are clearly beautiful and appealing, but what is the scientific reason for these bold fall colors?

In the spring and summer, leaves are green because chlorophyll, the chemical that converts light into energy by photosynthesis, is present at that time. If no other compounds were present, leaves would naturally turn yellow in the fall when the chlorophyll breaks down due to temperature, light and weather conditions. However, when the chlorophyll is no longer present, it is possible to see the effects of other chemicals present in the leaves, such as carotenes or carotenoids, which result in orange leaves.

Red leaves are not the result of pre-existing chemicals in the leaves; rather, the color is from a chemical produced as the leaves die. These compounds, called anthocyanins, are made from residual sugar, similar to what you find in grapes and apples. Shade variations result from interactions with leftover chlorophyll pigment. An additional source of variation comes from the differences in the tree species, genetics and environment, according to Dr. John Silander, an ecologist and evolutionary biologist at the <a href="http://www.uconn.edu" target="_blank">University of Connecticut</a>.

Understanding the chemical basis for the change doesn’t explain why the leaves turn red, a process that takes energy. Dr. Silander points to some evolutionary explanations, but noted they contain contradictions. According to a 2007 paper published in The Botanical Review, leaves may change color to attract animals to feed on fruit and thereby spread seeds. It’s also possible that the coloration serves the opposite function, to warn animals that the leaves contain compounds that would be toxic to them, like the famous wings of the monarch butterfly. 

Alternatively, the coloration may be a pest deterrent, since insects could prefer to camouflage their eggs in drab leaves. “It may be an ‘I’m super-healthy, don’t bother’ signal to potential insects, pests, or parasites that they should look elsewhere,” Kerissa Battle, a community science educator at Community Greenways Collaborative, wrote in an email. But then again, she said, the red color could also signal that a leaf is on its way out, with few nutrients left to eat before it drops.

Another, non-evolutionary, explanation could be related to sun protection, at least in maple trees. Dr. Robert Guy, a professor of forestry at the University of British Columbia, proposed this idea supported by the work of Dr. Abby van den Berg, an ecologist at the University of Vermont. They found that protecting leaves from sun damage allows them to carry out important processes like storing nutrients in the tree.   “Protection from bright light (and probably UV light as well) during the process of leaf senescence is the best explanation for why the leaves of some trees turn red in autumn,” Dr. Guy wrote in an email.

Whether the changing colors function as animal attraction, pest deterrent, sign of health, or sunscreen, enjoy the glory of the autumn foliage season in the knowledge that they are not only beautiful, but potentially very useful too.

The science behind fall leaf colors

Fall leaf colors are not a simple matter as scientists...

High avocado prices are fueling deforestation in Mexico. Americans' love for avocados and rising avocado prices for the highly exportable fruit are fueling the deforestation of central Mexico's pine forests as farmers rapidly expand their orchards to feed demand.

<a href="http://www.earth.com/news/healthier-food-pairings/">Avocado</a> trees flourish at about the same altitude and climate as the pine and fir forests in the mountains of Michoacan, the state that produces most of Mexico's avocados. That has led farmers to wage a cat-and-mouse campaign to avoid authorities, thinning out the forests, planting young avocado trees under the forest canopy, and then gradually cutting back the forest as the trees grow to give them more sunlight.

"Even where they aren't visibly cutting down forest, there are avocados growing underneath (the pine boughs), and sooner or later they'll cut down the pines completely," said Mario Tapia Vargas, a researcher at Mexico's National Institute for Forestry, Farming and Fisheries Research.

Given that Michoacan's forests contain much of the wintering grounds of the monarch butterfly, the deforestation is more than just an academic issue. Authorities have already detected small avocado plots in the monarchs' reserve where farmers have cut down pine forest.

Worse, Tapia Vargas said, a mature avocado orchard uses almost twice as much water as fairly dense forest, meaning less water reaches Michoacan's legendary crystalline mountain streams on which the forests and animals depend.

Greenpeace Mexico says people are likely to suffer, too.

"Beyond the displacement of forests and the effects on water retention, the high use of agricultural chemicals and the large volumes of wood needed to pack and ship avocados are other factors that could have negative effects on the area's environment and the well-being of its inhabitants," Greenpeace said in a statement.

The two-lane rural roads that cut through the mountains are choked with lines of heavy trucks carrying avocados out and pickers in to the orchards.

But it is hard to argue farmers out of the economic logic of growing avocados.

"Avocado farming is very attractive, because of the prices being the way they are," Tapia Vargas said.

Avocado prices jumped from around 86 cents apiece in January to around $1.10 in July, partly because of weak seasonal supply from Mexico. And the peso lost 16 percent of its value against the dollar over the past year, making exports cheaper for the U.S. customers. Mexican farmers can make much higher profits growing avocados than from most other crops.

It is the enormous U.S. appetite for avocados that has driven the expansion. Between 2001 and 2010, avocado production in Michoacan tripled, but exports rose 10 times, according to a report published in 2012 by Tapia Vargas' institute.

And if Super Bowl guacamole has had this effect, just wait for skyrocketing demand from China, where imports of Mexican avocados have been growing by about 200 percent annually.

"You can imagine what it will take (to supply) the Chinese market," Michoacan Gov. Silvano Aureoles told local media in July.

The Tapia Vargas report suggested the expansion caused loss of forest land of about 1,700 acres (690 hectares) a year from 2000 through 2010.

Ignacio Vidales, another government researcher who specializes in avocados, said he believes the deforestation rate has slowed, in part because authorities are taking it more seriously.

"We think that it (deforestation) is less, because there is more enforcement now than in previous years," said Vidales.

Authorities have begun to fight back.

On July 31, federal police in Morelia, the Michoacan state capital, detained 13 people and seized two avocado plants and two vehicles that were being used to turn a recently deforested plot into an orchard.

Police said 260 pine trees and 87 firs had been cut down on a 12-acre (4.7-hectare) plot to make room for 1,320 avocado saplings. While the trees take seven years to reach maturity, if each bore 100 avocados a year - a fairly low yield - those farmers could make as much as $500,000 annually from the plot, a fortune for area farmers.

"More than anything else, it is economic pressure," Vidales said. "They have seen that planting avocados is more profitable than planting corn, or other crops, or even the forest."

© 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.

High avocado prices are fueling deforestation in Mexico

High avocado prices are fueling deforestation in Mexico. Americans' love...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image 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

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image 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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Flu viruses are more flexible than expected

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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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

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



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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Detecting mercury contamination with the tap of a finger

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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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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How does salt makes things taste better?

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image 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



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.

Santiago, Chile in South America

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Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&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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Interactive map of the universe includes 200,000 galaxies

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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 the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



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



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.

The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image 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



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.

The province of Zaragoza in northeast Spain

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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



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.

The rapid retreat of the Columbia Glacier

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image 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



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.

The Pyrenees Mountains in southwest Europe

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Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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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



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.

Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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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



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.

Satellites reveal how Earth's systems are interconnected

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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



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.

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



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.

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 a new map of Mars that is providing insight into the planet’s watery past. The map also reveals where future missions could safely land on Mars.&nbsp;



The map has been created over the last decade using observations of water-rich rocks and mineral deposits. The images were captured by ESA’s Mars Express and NASA’s Mars Reconnaissance Orbiter.



"A big surprise is the prevalence of these minerals, with the map revealing hundreds of thousands of water-affected locations in the oldest parts of the planet," says ESA. "The new data will help answer exciting questions about Mars’ climate history, whether water was globally persistent or confined to short, intense episodes, and whether the conditions were ever suitable for life."



"Specifically, the map shows the locations and abundances of aqueous minerals. These are from rocks that have been chemically altered by the action of water in the past, and have typically been transformed into clays and salts."



According to John Carter of the Institut d’Astrophysique Spatiale (IAS), our collective understanding of Mars has been oversimplified. He explained that planetary scientists have tended to think that only a few types of clay minerals on Mars were created during its wet period, then as the water gradually dried up, salts were produced across the planet.



The new map shows that the composition of Mars is much more complicated than what we thought. For example, while many salts formed after Martian clays, there are some salts that are presumed to be older than some of the clays.&nbsp;



“The evolution from lots of water to no water is not as clear cut as we thought, the water didn’t just stop overnight. We see a huge diversity of geological contexts, so that no one process or simple timeline can explain the evolution of the mineralogy of Mars. That’s the first result of our study. The second is that if you exclude life processes on Earth, Mars exhibits a diversity of mineralogy in geological settings just as Earth does,” said Carter.



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



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.

The history of Mars is much more complex than we thought

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Today's Video of the Day from the <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes how cavefish adapted to a sedentary lifestyle over tens of thousands of years. 



The experts found that the muscle metabolism of cavefish has been genetically reprogrammed over time. As a result, the animals have experienced major changes in their morphology and behavior. Despite these changes, however, the cavefish remain healthy and fit.



The research may provide new clues about the evolutionary consequences of prolonged physical inactivity in humans.&nbsp;



“It’s no surprise that people are moving less and less as technology has advanced,” said Rohner. “With cavefish, we have a unique system where we can study what might happen if people remained couch potatoes over very, very long periods of time.”



Video Credit: Stowers Institute for Medical Research



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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



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.

Cavefish are healthy despite their sedentary lifestyle

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> some of the most incredible waves in the world, as seen by Landsat satellites.



"With more than 370,000 miles of coastline on Earth, there are plenty of places where epic waves build up, curl over, and hurtle toward the shore.- much to the thrill of surfers," says NASA. "There are some places where these waves are so magnificent that they can be seen from space."



"With the broad perspective of satellites, we can see how these iconic waves develop into the world’s tallest, longest, fastest, and heaviest."



Video Credit: NASA Earth Observatory&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



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.

Satellites capture the world's biggest and fastest waves

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes why satellite images and measurements of our planet have become "essential to our survival, offering a new outlook of our world."&nbsp;



Rising sea levels pose one of the biggest societal threats associated with climate change. According to ESA, satellite altimeter missions such as Copernicus Sentinel-6 are essential in monitoring global and regional changes in sea level.



"Unbeknown to many, the island of Crete, Greece, plays an important role in the Copernicus satellite altimetry constellation and on an international stage," reports ESA.



"Satellite altimetry data have to be continuously monitored at the ESA’s Permanent Facility for Altimetry Calibration where different techniques have pioneered the use of transponders to provide the best measurements to validate satellite altimeters in space soon after launch."



Dr. Craig Donlon explains that, by understanding planet Earth through satellite measurements, we are able to find evidence of change.&nbsp;



Video Credit: European Space Agency&nbsp;



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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

Satellites have become essential to our survival

[sendtonews key="761m2QQvR1-2035772-12187" type="single"] Today’s Video of the Day from the...