Climate Change News - ENN
Updated: 5 days 21 hours ago
The first global, long-term satellite study of airborne ammonia gas has revealed “hotspots” of the pollutant over four of the world’s most productive agricultural regions. The results of the study, conducted using data from NASA’s Atmospheric Infrared Sounder (AIRS) instrument on NASA’s Aqua satellite, could inform the development of strategies to control pollution from ammonia and ammonia byproducts in Earth’s agricultural areas.A University of Maryland-led team discovered steadily increasing ammonia concentrations from 2002 to 2016 over agricultural centers in the United States, Europe, China and India. Increased concentrations of atmospheric ammonia are linked to poor air and water quality.
With the first day of spring around the corner, temperatures are beginning to rise, ice is melting, and the world around us is starting to blossom. Scientists sometimes refer to this transition from winter to the growing season as the “vernal window,” and a new study led by the University of New Hampshire shows this window may be opening earlier and possibly for longer. “Historically, the transition into spring is comparatively shorter than other seasons,” said Alexandra Contosta, a research assistant professor at the University of New Hampshire’s Earth Systems Research Center. “You have snow melting and lots of water moving through aquatic systems, nutrients flushing through that water, soils warming up, and buds breaking on trees. Something striking happens after a very cold winter or when there’s been a lot of snow. Things seem to wake up all together, which is why spring seems to happen so quickly and can feel so dramatic.”
Measures such as river restoration and tree planting aim to restore processes that have been affected by human activities like farming, land management and house-building. Natural flood management is an area of increasing interest for policy makers, but its implementation can present a complex balancing act between the needs of different groups, including the public, farmers and land owners. Mixed messages about their effectiveness and the scale needed to implement natural flood management measures successfully add to the uncertainty surrounding their benefits. Now a team of experts, led by Dr Simon Dadson of the School of Geography and the Environment at the University of Oxford, has compiled evidence on natural flood management to inform policy decision-making and show where there are still crucial gaps in knowledge. The article shines a light on the scientific evidence available from a variety of sources, ranging from field data to model projections and expert opinion.
Plants possess molecular mechanisms that prevent them from blooming in winter. Once the cold of win-ter has passed, they are deactivated. However, if it is still too cold in spring, plants adapt their blooming behavior accordingly. Scientists from the Technical University of Munich (TUM) have discovered genetic changes for this adaptive behavior. In light of the temperature changes resulting from climate change, this may come in useful for securing the production of food in the future.
The National Science Foundation (NSF) has made a $5.6 million, five-year grant to establish a Long-Term Ecological Research (LTER) site along the northern Alaskan coast that will focus on the interactions between land and ocean that shape coastal ecosystems in the Arctic over different time scales.Researchers at the Beaufort Sea Lagoons LTER site will study food webs, which support large-scale coastal fisheries and more than 150 species of migratory birds and waterfowl. Long-term changes along the northern Alaska coast have already affected the types of fish and other creatures that live in the lagoons, and are expected to continue to do so. The LTER research team will collaborate with members of local communities, including the Iñupiat, and with the U.S. Fish and Wildlife Service, which manages the Arctic National Wildlife Refuge.
You are what you eat, as the saying goes, and while good dietary choices boost your own health, they also could improve the health care system and even benefit the planet. Healthier people mean not only less disease but also reduced greenhouse gas emissions from health care. As it turns out, some relatively small diet tweaks could add up to significant inroads in addressing climate change.
We know a lot about how carbon dioxide (CO2) levels can drive climate change, but how about the way that climate change can cause fluctuations in CO2 levels? New research from an international team of scientists reveals one of the mechanisms by which a colder climate was accompanied by depleted atmospheric CO2 during past ice ages.The overall goal of the work is to better understand how and why the earth goes through periodic climate change, which could shed light on how man-made factors could affect the global climate.
Once a tropical storm, now a sub-tropical storm, the remnants of the tropical low pressure area formerly known as 11S was spotted by NASA's Aqua satellite, still spinning in the Southern Indian Ocean.On March 14 at 2230 UTC (6:30 p.m. EST) the remnants of Tropical Cyclone 11S were located near 29.8 degrees south latitude and 52.4 degrees east longitude, about 530 nautical miles south-southwest of La Reunion Island.
Polar cod fulfil a key role in the Arctic food web, as they are a major source of food for seals, whales and seabirds alike. But the polar cod themselves might soon be the hungry ones. Under the ice of the central Arctic, the juvenile fish are indirectly but heavily dependent on ice algae. As a result, retreating sea ice could have far-reaching impacts on the food web. Though researchers have long since suspected this relation existed, an international team of researchers led by the Alfred Wegener Institute (AWI), Helmholtz Centre for Polar and Marine Research, have now successfully confirmed it.
Without major efforts to rebuild Louisiana’s wetlands, particularly in the westernmost part of the state, there is little chance that the coast will be able to withstand the accelerating rate of sea-level rise, a new Tulane University study concludes.The study by researchers in Tulane’s Department of Earth and Environmental Sciences and published in the open-access journal Nature Communications shows that the rate of sea-level rise in the region over the past six to 10 years amounts to half an inch per year on average.
Massive coastal flooding in northern Europe that now occurs once every century could happen every year if greenhouse gas emissions continue to rise, according to a new study.New projections considering changes in sea level rise, tides, waves and storm surge over the 21st century find global warming could cause extreme sea levels to increase significantly along Europe’s coasts by 2100. Extreme sea levels are the maximum levels of the sea that occur during a major storm and produce massive flooding.
For the second year in a row, carbon dioxide levels in the atmosphere have increased at a record rate, jumping 3 parts per million (ppm) in 2016, according to data from the National Oceanic and Atmospheric Administration. CO2 concentrations rose 3.03 ppm in 2015, making the last two years the first time that the greenhouse gas has risen more than 3 ppm in NOAA’s 59 years of monitoring, Climate Central reported.
New research investigating the transition of the Sahara from a lush, green landscape 10,000 years ago to the arid conditions found today, suggests that humans may have played an active role in its desertification. The desertification of the Sahara has long been a target for scientists trying to understand climate and ecological tipping points. A new paper published in Frontiers in Earth Science by archeologist Dr. David Wright, from Seoul National University, challenges the conclusions of most studies done to date that point to changes in the Earth's orbit or natural changes in vegetation as the major driving forces.
Last week Royal Dutch Shell agreed to sell most of its Athabasca oil sands investment to a Canadian exploration company for $8.5 billion. To many, this was anything but a surprise. In 2015, the world’s second largest publicly-traded oil company put the brakes on its Pierre River development, suggesting it wasn’t the right time for Shell to enter what was at the time the largest oil sands development in Canada.
A Montana State University assistant professor of sustainable food systems who has conducted research all over the world is turning her attention to maple syrup.Some farmers in the United States and Canada have noticed that the quantity and quality of their maple syrup is changing with climate variability, said Selena Ahmed from MSU's Department of Health and Human Development in the College of Education, Health and Human Development. Ahmed is co-leading a team of researchers who are investigating these observations.
A new analysis indicates that the UK’s CO2 output is at a record low, and it’s largely down to one major action: a reduction in coal use.
Scientists have found the seasonal “fingerprints” of Arctic sea ice, El Nino, and other climate phenomena in a new study that probes the global interactions between weather and climate.
In the last 800,000 years, Earth has chilled and thawed its way through eight ice ages, each lasting tens of thousands of years. But why? Why didn’t Earth just freeze the one time and stay that way?
The hidden toll that subsidies for electricity, fossil fuels, and transport have on social welfare, economic growth and technological innovation needs to be exposed through better research says a new paper in Ecological Economics by Benjamin K Sovacool.Energy subsidies, which have mostly supported fossil fuels and nuclear power over the previous half century, have historically kept energy prices artificially low, compared to market rates. But they come at a high cost to governments and taxpayers. The Indian government, for example, spends as much as it does on fuel subsidies for kerosene and liquid propane, used to light rural houses, as it does on education. India subsidises fossil energy consumption by $21 billion every year, which works out at $16 per person. Given that 500 million of its people live on less than $2 per day, this is a surprisingly large amount.
Dartmouth Study Finds Increased Water Availability from Climate Change May Release More Nutrients into Soil in the McMurdo Dry Valleys of Antarctica
As climate change continues to impact the Antarctic, glacier melt and permafrost thaw are likely to make more liquid water available to soil and aquatic ecosystems in the McMurdo Dry Valleys, potentially providing a more nutrient-rich environment for life, according to a Dartmouth study recently published in Antarctic Science. (A pdf of the study is available upon request).With an average annual air temperature of -2.2 F and an average precipitation of 3-50 mm per year, the McMurdo Dry Valleys of Antarctica are dominated by dry soils underlain by permafrost. The Dry Valleys ecosystem is severely limited by liquid water and nutrients, resulting in limited organic matter. One such limited nutrient is phosphorus, an element that is essential to all living organisms. Understanding the spatial distribution of phosphorus in the soil is crucial to identifying where life could become more abundant in the future.