Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features an astronaut photograph of the northern part of the Quirimbas Islands near the Tanzania border. According to NASA, the light blue-green water highlights the shallow complex of corals, sand, and seagrass surrounding the islands.



"The Quirimbas Islands stretch 322 kilometers (200 miles) along Mozambique’s coastline and are teeming with an impressive array of plants and animals. The 32 small islands that make up the archipelago are partly linked to the coast by mangroves, sand bars, and coral reefs," says NASA.



"The islands’ waters host 52 species of corals, 140 species of mollusk, and eight species of marine mammals including whales and dolphins. Five species of sea turtles are found there: loggerhead turtle (Caretta caretta), green turtle (Chelonia midas), leatherback turtle (Dermochelys coriacea), hawksbill turtle (Eretmochelys imbricata) and olive ridley (Lepidochelys olivacea). All five of these species are listed by the International Union for Conservation of Nature as being threatened with extinction."



Vamizi is one of the largest islands of the Quirimbas Archipelago and the most important green turtle nesting site in Mozambique. NASA reports that increased tourism and fishing on and around Vamizi has put pressure on the island’s marine ecosystem.&nbsp;



Image 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



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The Quirimbas Islands off the coast of Mozambique

Today's Image of the Day from NASA Earth Observatory features...

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features the Chachani volcano in the Andes Mountains. The photo was captured by an astronaut onboard the International Space Station (ISS) while orbiting over the western edge of South America.



The Chachani volcano is located north of Arequipa, the second most-populous city in Peru. "While Peru has several active volcanos, Chachani is considered dormant. Evidence of past volcanic activity here arises from the remnant lava domes, stratovolcanoes, and shield volcano that mark the landscape," reports NASA.



"Chachani is much broader than it is tall, standing approximately 2,000 meters (6,600 feet) above its surrounding terrain with a width of about 17,000 meters (55,800 feet). Its slopes are still steep for those navigating the terrain, as indicated by faint zig-zag roads (also called switchbacks) on the southeastern flank of the mountain. These paths are used by hikers to start their ascent toward the peak.'



"Snowfields are visible near the peaks, but no glaciers currently remain on this mountain. The region once had extensive glaciers during the last glacial maximum about 20,000 years ago."



Image Credit: NASA Earth Observatory&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

The Chachani volcano in the Andes Mountains

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features the Sichuan Basin in southwestern China, where the remains of an ancient lake have been transformed into rolling hills and fertile farmland over time. According to NASA, the basin is often filled with air pollution and haze.



"When the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite acquired this image on January 31, 2023, a layer of haze had settled in the basin. The pall obscured cities and other surface features that are visible on clearer days, though a series of ridges could be seen poking above the pollution in the northeastern part of the basin," says NASA.



"On the day the image was acquired, measurements from several ground-based sensors in Chongqing and around the southeastern part of the basin reported fine particulate matter (PM2.5) measurements well above 200 on the air quality index, according to data published by the World Air Quality Index Project. That is high enough to be designated 'very unhealthy' by health authorities."



The most common sources of pollution in the Sichuan Basin include vehicle emissions and coal and wood burning during winter.&nbsp;



Image 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



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The Sichuan Basin filled with haze

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features northwestern Madagascar, where Tropical Storm Cheneso triggered deadly flash flooding and landslides. Dozens of people were killed and tens of thousands were displaced as a result of the storm.&nbsp;



"Cheneso first hit northeast Madagascar on January 19 as a strong tropical storm. The storm weakened as it moved inland but high winds and substantial rainfall continued as it tracked southwest across the island. On January 23, the storm’s center moved offshore and over the Mozambique Channel, where it spent several days churning, strengthening, and pummeling the western coast with rain," says NASA.



The image was captured on January 29, 2023 by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite.



Image 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



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Madagascar swamped with rain from Tropical Storm Cheneso

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features Māʻalaea Bay on Maui’s southern shore, an area that is known for its large waves.&nbsp;



Two of Maui’s most iconic waves, known as “Freight Trains” and “Jaws,” are famous among surfers. While Freight Trains is considered one of the fastest surfable waves in the world, Jaws is known for big-wave surfing.



"The large waves, or swells, are typically generated in the southern hemisphere during winter, when large storms brew in the southern Pacific Ocean," reports NASA.



"The waves can travel thousands of miles, crossing the equator and eventually reaching Maui’s southern shore, where it is summer. But the waves can lose energy along the way as they encounter numerous island chains in the South Pacific."



"The foam produced by breaking waves shows up in satellite images as a white band close to the shore."&nbsp;



The image was captured on October 3, 2018 by the Operational Land Imager (OLI) on Landsat 8. A small amount of foam is visible near the harbor. According to NASA, theses late season waves were likely produced by Hurricane Walaka, a category-4 storm centered about 750 miles west of Māʻalaea.



Image Credit: NASA Earth Observatory&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

The iconic waves of Maui’s southern shore

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features the Villarrica volcano in Chile, where steam and other gases are visible after a series of eruptions in recent months.&nbsp;



"Located along Chile’s southern Andes, Villarrica is one of the most active volcanoes in South America. In the inset, steam is coming from Villarrica’s crater. A streak of ash is visible on the volcano’s snow-covered eastern flank," says NASA.



"Chile’s National Geology and Mining Service (Sernageomin) reported daily, minor Strombolian explosions in January 2023, which have ejected glowing rock as high as 100 meters (330 feet) above the crater rim. An increase in earthquakes and sulfur dioxide emissions in late October and early November 2022 led to Sernageomin raising the alert level from green to yellow on November 8, 2022."



NASA notes that low-level Strombolian activity - named after the Stromboli volcano in Italy - is common at Villarrica.&nbsp;



“Strombolian eruptions are short, lasting minutes,” explains Francisco Delgado, a volcanologist at the University of Chile. “These small basaltic eruptions happen when a big bubble of water vapor fragments the lava. The fragments explode into the air and solidify as pyroclasts.”



According to NASA, Villarrica is one of the most dangerous volcanoes in the southern Andes volcanic zone of Chile and Argentina, and typically erupts every three to six years.&nbsp;



The image was captured from the International Space Station on January 17, 2023.



Image 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



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Steam rises from the Villarrica volcano in Chile

A recent study published in the journal <a href="http://dx.doi.org/10.1111/brv.12931">Biological Reviews</a> has found that over one in six bird eggs fail to <a href="https://www.earth.com/news/neon-gobies-decide-when-to-hatch-their-embryos/">hatch</a>, and hatching failure increases as bird species decline. Moreover, the experts discovered that hatching failure is a much bigger problem in the case of captive threatened species, with nearly half of their eggs failing to hatch. These findings provide evidence that conservation managers could use in their decision making for creating the best possible outcomes for endangered bird species recovery.



By assessing 241 bird species across 231 previous studies to examine hatching failure, the researchers discovered that almost 17 percent of bird eggs fail to hatch, which is nearly double than the number reported four decades ago. These values are even more worrisome in the case of endangered species, with 43 percent of eggs from threatened species bred in captivity being unsuccessful in hatching.



“Around 13 percent of bird species globally are currently threatened with extinction, and things are getting worse instead of better. Species on the verge of extinction have much higher levels of hatching failure compared to non-threatened species, and breeding birds in captivity appears to be having a negative impact,” said study co-author Nicola Hemmings, an expert in Biosciences at the <a href="https://www.sheffield.ac.uk/">University of Sheffield</a>.



“There are important considerations that we need to make - does the benefit of captivity and other interventions outweigh the reduced reproduction of these species? For many species, these practices are absolutely vital for species survival, so we need to carefully weigh up the pros and cons of different approaches to ensure that we are doing everything that we can to protect birds from extinction.”



The scientists outlined four different conservation practices associated with lower hatching rates, including keeping birds in captivity, hatching eggs in artificial incubators, feeding the birds supplementary foods, and providing them with artificial nest boxes or sites. However, despite their potentially negative impact of hatching, some of these measures may still prove important to birds’ survival and reproduction. For instance, the eggs of some ground-nesting birds are at such a high risk of predation that leaving them in the wild would most likely result in their destruction.



“With this work we hope to provide vital evidence needed to understand how effective different management practices are at improving hatching success and aid population recovery,” said study senior author Patricia Brekke, a researcher at the <a href="https://www.zsl.org/science/users/patricia-brekke">Zoological Society of London</a> (ZSL).&nbsp;



“Conservation managers are doing an amazing job of preventing species decline, but they have an incredibly difficult job of making decisions when species are at the brink of extinction, on what tools to implement, and when. This kind of work provides the evidence necessary to improve decision making and hopefully improve recovery,” she concluded.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Hatching failure rates increase as bird species decline

A recent study published in the journal Biological Reviews has...

A team of researchers led by the <a href="https://www.uc.edu/">University of Cincinnati</a> (UC) has recently discovered a new species of frog in Tanzania’s Ukaguru Mountains. The Ukaguru spiny-throated reed frog (Hyperolius ukaguruensis) has a distinct feature: it is among the few species of <a href="https://www.earth.com/news/why-do-frogs-have-fused-forearms/">frogs</a> in the world that do not vocalize at all. Belonging to a group of “spiny throated” reed frogs, it is characterized by the presence of tiny spines on the male’s throat, which the frogs use to recognize other members of their species.



“It’s a very odd group of frogs,” said study lead author Lucinda Lawson, a conservation biologist at UC. “The male frogs don’t call like most other frogs do. We think they may use the spine as something like Braille for species recognition. “Without a call, they need some other way to recognize each other.”



H. ukaguruensis belongs to a family of nearly 200 species in the genus Hyperolius. According to the experts though, it may be significantly different from other species from this genus. “With any Hyperolius, I can probably tell by looking at it whether it’s new or potentially new,” Lawson explained. “Immediately it was clear that it was a spiny-throated reed frog. But this one was a golden, greenish brown instead of the green color found in the other species. Sometimes color variation doesn’t mean anything, but it might here.”



A combination of genetic and genomic analyses confirmed that this frog was distinct from other members of Hyperolius, while measurements shown that it had unique body proportions, with smaller eyes in relation to its head than other spiny-throated reed frogs.



As many of its relatives, H. ukaguruensis is a critically endangered species and should thus be considered of high conservation concern, particularly since amphibians are highly susceptible to human impacts, such as deforestation. “If a bird’s habitat is destroyed, they sometimes can fly to a new forest. But that’s hard for amphibians,” Lawson said.&nbsp;



Conservation measures are highly important because having a diversity of species is crucial to maintain healthy ecosystems. “We think about this question a lot: why does one species matter?” Lawson said.&nbsp;“If this one species goes extinct, nothing much happens. We just lose one more strand in the fabric of the ecosystem. But if you keep pulling out strands, the ecosystem becomes destabilized and the fabric unravels,” she concluded.



The study is published in the journal <a href="http://dx.doi.org/10.1371/journal.pone.0277535">PLoS ONE</a>.&nbsp;&nbsp;



Image Credit: Christoph Liedtke



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Voiceless frog recently discovered in Africa

A team of researchers led by the University of Cincinnati...

Air,Pollution,From,Power,Plant,Chimneys.

<a href="https://www.earth.com/news/childhood-obesity-linked-to-mothers-poor-dietary-choices/">Obesity</a> is a major public health issue that is caused by unhealthy diets, lack of exercise, and genetics. In a recent study from the <a href="https://umich.edu/">University of Michigan</a>, researchers have found an unexpected environmental factor that plays a role in obesity. The experts have discovered a link between air pollution and excess body weight among women.&nbsp;



According to study first author Xin Wang, women in their late 40s and early 50s exposed long-term to air pollution experience increases in their body mass index, waist circumference and body fat. These negative effects were linked specifically to higher levels of fine particles, nitrogen dioxide, and ozone.



"The study population included 1,654 White, Black, Chinese, and Japanese women from the Study of Women’s Health Across the Nation, with the baseline median age of 49.6 years, followed from 2000 to 2008," wrote the researchers.



"Annual air pollution exposures were assigned by linking residential addresses with hybrid estimates of air pollutant concentrations at 1-km2 resolution. Body size was measured, and body composition was measured using DXA at approximately annual visits."



"Linear mixed effects models were used to examine the associations between air pollution and body size and composition measures and whether these associations differed by physical activity."



The results of the analysis showed that exposure to air pollution was linked with higher body fat, higher proportion fat, and lower lean mass among midlife women. For instance, body fat increased by 4.5 percent, or about 2.6 pounds.



The researchers also investigated the relationship between air pollution and physical activity on body composition. They determined that high levels of physical activity could effectively mitigate and offset the body composition changes associated with exposure to air pollution.



Wang explained that since the study focused on midlife women, the findings can't be generalized to men or women in other age ranges.



The study is published in the journal <a href="https://diabetesjournals.org/care/article-abstract/doi/10.2337/dc22-0963/147568/Longitudinal-Associations-of-Air-Pollution-With?redirectedFrom=fulltext">Diabetes Care</a>.



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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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Study reveals link between air pollution and obesity

Obesity is a major public health issue that is caused...

When we were children, many of us experienced the illusion that summers or other periods of time were much longer than how we perceive the passage of a similar amount of time in adulthood. Now, a team of scientists led by <a href="https://www.elte.hu/en/">Eötvös Loránd University</a> in Hungary has investigated empirically whether the perception of time changes with <a href="https://www.earth.com/news/aging-female-monkeys-focus-more-on-meaningful-relationships/">age</a> and, if so, how and why.



The experts enrolled a cohort of participants from three age groups (4-5, 9-10, and above 18 years old) and asked them to watch two one-minute long videos. The samples were extracted from a popular animated series, and were balanced in visual and acoustic features, expect for one feature – eventfulness. While one clip consisted of a rapid succession of events (a policemen rescuing animals and then arresting a thief), the other was a monotonous, repetitive sequence (six prisoners escaping on a rowing boat). After watching the videos, the participants were asked which was longer.&nbsp;



The answers revealed that, while two-thirds of the pre-kindergartners perceived the eventful video as longer, three-fourths of the adults felt the same thing about the uneventful one. The middle group, in which participants expressed a similar but more moderate bias than the adults, helped researchers estimate a shift in time perception occurring around the age of seven.



To explain these differences in time perception between age groups, the experts relied upon the concept of “heuristics,” which was introduced in Cognitive Science by Amos Tversky and Daniel Kahneman, and refers to our ability to use mental shortcuts or proxies to help us make fast decisions. Since our brain does not have a reliable central clock or a direct sensory mapping of durations (unlike in the case of distances or pitch), we must use a proxy to get a handle on temporal passage.&nbsp;



According to the scientists, children use a “representativeness heuristics” to measure time. For instance, they ask themselves which video they can talk more about. Since the eventful video was packed with actions and consisted of several episodes, they could talk more about it and they thus felt that it was longer. However, between six to ten years of age, children learn the concept of “absolute” or “universal” time, which is conceptualized as a physical entity independent of the events that it connects, and can help us make appointments, organize our tasks, and follow timelines by clocking the time. With such a development, our representativeness heuristics for measuring time changes into a “sampling heuristics,” which helps us check the flow of time by frequently sampling it, for instance, by looking at a clock or watching the traffic flow.



Thus, as adults, when we watch a captivating movie, our mind becomes highly immersed in the story, while during a boring movie, we are going to repeatedly check our watch or think about something else, and all of these distractions will enable us to sample the flow of absolute time.&nbsp;



According to the researchers, these two types of heuristics can explain the rather bizarre switch at about age seven and give rise to the persistent bias that uneventful meetings, for example, are much longer than they actually are. However, more research is needed to properly understand the mystery of time and how our minds can make sense of it.



The study is published in the journal <a href="http://dx.doi.org/10.1038/s41598-023-27419-4">Nature Scientific Reports</a>.&nbsp;&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Children and adults perceive time differently

When we were children, many of us experienced the illusion...

Scientists have long argued that play is an indicator and promotor of animal health and welfare. Now, by applying in-depth empirical methods to analyze data gathered from around the world, a team of researchers led by the <a href="https://www.adelaide.edu.au/">University of Adelaide</a> in Australia has found that playing with your <a href="https://www.earth.com/news/can-you-tell-if-your-cat-is-playing-or-fighting/">cat</a> can also nurture closer human-cat bonds.



To investigate play-related factors associated with welfare in cats, the scientists devised an online survey in consultation with veterinarians, animal behaviorists, and cat owners, aiming to measure factors such as cat quality of life, cat-owner relationship quality, behavioral changes, and problem behavior prevalence.



“Our survey results, based on responses from 591 cat guardians from 55 countries, indicated greater cat playfulness and more types of games played were significantly associated with better cat quality of life,”&nbsp;said study lead author Julia Henning, a PhD student in Feline Behavior at Adelaide.



“Also, longer amounts of daily play, greater number of games, both cat and guardian initiating play, and heightened guardian playfulness were also associated with better quality cat-guardian relationships.”



Moreover, exclusive indoor housing for the cats was significantly linked with both increased cat quality of life and better cat-owner relationship in comparison to cats with outdoor access. “Behavioral changes that indicated stress, frustration, or unease were reported when play was absent. Therefore, we can conclude play may be a very important factor in assessing and maintaining cat welfare,” Henning explained.&nbsp;



However, as senior author Susan Hazel (an expert in Animal Behavior and Welfare at the same university) admitted, self-reporting surveys such as this often have significant limitations. “Cat lovers’ answers may be prone to respondent and recall bias and limited in their ability to assess behavior. Participants who dedicated their time and effort on a voluntary basis are more invested in their cat’s care than the average cat guardian. Therefore, responses may not be an accurate representation of the general population.”



Further research is needed to clarify how much and what kind of play is most efficient for improving cat welfare.



The study is published in the journal <a href="http://dx.doi.org/10.1017/awf.2023.2">Animal Welfare</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Cats have a better quality of life if you play with them

Scientists have long argued that play is an indicator and...

Symbiotic relationships are everywhere in nature. Fungi enhance water and <a href="https://www.earth.com/news/water-quality-threatened-by-nutrient-pollution-in-40-u-s-states/">nutrient</a> absorption for plants by feeding on their roots. Ants find food and shelter in tree structures, while insects defend the trees from being eaten. However, not all symbiotic relationships are created equal.&nbsp;



Some interactions are specific, where one host pairs off with only one other species. Others are general and flexible. Specific relationships have advantages, allowing the two species to reap mutual benefits and co-evolve. But this type of partnership can also come with a cost, where one partner exploits the other and takes more than it offers in return.



To investigate the evolutionary dynamics of specialization, researchers at the <a href="https://www.upenn.edu/">University of Pennsylvania</a> developed a model framework using game theory.



“Each interaction has very different dynamics,” said study senior author Erol Akçay. “Generalists may evolve to work better with more partners, specialists may be specializing to be more cooperative, and other specialists may be specializing to exploit better. Ours is the first study that gets at that dialectical nature of specialization, not just looking at specialization versus generalization.”



As an undergraduate student, Chris Carlson became interested in understanding why variations in generalism and specialism might persist.&nbsp;



Working with Akçay and Bryce Morsky, a model was developed that imagines the interactions of designated “hosts” with either general or specialized preferences and “symbionts” that provide and receive different benefits and costs from their interactions with various hosts.



The experts found that a cooperative partnering strategy, where both parties benefit, could persist in populations with one specialized host and a corresponding specialized symbiont. Depending on the benefits or payoffs, a generalist partnering strategy could also persist.



On the other hand, in partnerships where the host increased benefits while the symbiont reaped less, a more dynamic outcome arose. Different hosts and symbionts rise and fall in the population over time. Generalists were driven to extinction if the payoff was lower than that of being a specialist.&nbsp;



The researchers applied a spatial layer to their models to reflect that symbiotic relationships require that the two species involved encounter one another in space.



“Neighbors are going to be more likely to interact with neighbors, so who your neighbor is and how they interact can affect the outcome,” said Morsky



The team found that cooperative specialists could develop “patches” of dominance if they could move over short distances. If the payoff was high enough, generalists could persist around the periphery of these patches. If, however, hosts and symbionts could move over greater distances, just one host-symbiont pair could completely dominate a space.



“Let’s say you have a coral reef with different types of coral and different types of algae,” said Akçay. “If a host is a cooperative specialist, and the symbiont it specializes on gets fixed, the host does better, and therefore those hosts may expand. That creates specific spatial patterns that we were able to track.”



An overall takeaway is that cooperative specialization appears to be a valuable strategy, but it comes with risks. A host’s cooperating partner could go extinct, leaving the host without a symbiont.



The researchers hope their work lends insight into the variety of patterns of mutualisms that exist in nature and contribute to biodiversity.



“When people discuss specialization, this dualism is always in the background,” said Akçay. “This work helps bring it out and clarifies the tensions that exist between mutualisms.”



The research is published in the journal <a href="http://dx.doi.org/10.1093/evolut/qpac056">Evolution</a>.



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By <a href="mailto:katherinebucko@gmail.com">Katherine Bucko</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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How do symbiotic relationships evolve between species?

Symbiotic relationships are everywhere in nature. Fungi enhance water and...

A new study led by the <a href="https://www.birmingham.ac.uk/index.aspx">University of Birmingham</a> has found that <a href="https://www.earth.com/news/ancient-trees-are-vital-to-forest-survival/">trees</a> living in conditions where carbon dioxide has been artificially elevated are likely to become more efficient in conserving water. The experts discovered that when trees are exposed to elevated levels of CO2, they increase their water use efficiency through higher carbon uptake. At the same time, the trees conserve water by adjusting the opening and closing of pores on their leaves (called “stomata”).&nbsp;



The findings will contribute to modeling and predicting plant behavior under the increased CO2 conditions that are expected to be the norm by mid-century.



Plants worldwide are characterized by a trade-off between carbon gain and water loss, as a result of their structure. While stomata open and close to allow plants to absorb CO2 for their growth, as the stomata open, water is leaving the plant through a process called “transpiration.” This means that plants must compromise between absorbing as much CO2 as possible while minimizing water loss.



The scientists analyzed data on long-term elevated CO2 experiments in trees over the past two decades, spanning 16 sites worldwide. The investigation revealed that the efficiency of water use in the trees’ leaves increased by 85 percent for a doubling of CO2 (the expected rise by 2050). Then, they used this data to compute the so-called “g1 number,” which expresses the water cost of carbon gain for each tree type, and discovered that this number did not in fact change under elevated CO2 conditions.



“The models we use to predict the responses of trees to future atmospheric CO2 levels still contain lots of uncertainties – and the behavior of stomata is one of these,” explained study lead author Anna Gardner, an expert in Tropical Tree Ecophysiology at Birmingham. 



“In elevated CO2 we might expect water consumption to reduce because stomata are taking in CO2 at a higher concentration so do not have to be open as long. But actually, we found the increased CO2 also caused an increase in photosynthesis – and this behavior was a stronger driver to increase water use efficiency. In effect, under higher CO2, the trees are getting more carbon gain for each ‘buck’ of water spent.”



“One reason trees are so important to ecosystems is because they store carbon – but water is also a valuable resource, so we need to find ways to accurately calculate the carbon cost of that water. All this data helps us build a more accurate picture of the likely behavior of these resources in the future,” she concluded.



The study is published in the journal <a href="https://doi.org/10.1111/nph.18618">New Phytologist</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Trees respond to rising CO2 levels by conserving water

A new study led by the University of Birmingham has...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="EPdZexVR30-1731237-12187" type="single"]</div>



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



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.

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



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.

Ocean heat influences regional climate

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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

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Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA’s Goddard Space Flight Center</a> describes how scientists are using autonomous sound sensors to monitor deforestation in the Amazon. By recording soundscapes, the experts can determine which animals are present through their distinct sounds.&nbsp;



Using this method, sounds can be used as scientific measurements to analyze the effects of deforestation. The researchers will gain a better understanding of how the acoustics of a forest can be used to measure its health.&nbsp;



"From space, parts of the Amazon rainforest that have previously been logged or burned may look lush and green, like a place buzzing with activity and full of sounds. But inside the rainforest, the animal life may tell a different story, of a harsh environment and a quieter soundscape," says NASA.



Video Credit: NASA’s Goddard Space Flight Center&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

Monitoring deforestation in the Amazon through sounds

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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 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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