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Ice-shelf retreat drives recent Pine Island Glacier speedup

Speedup of Pine Island Glacier over the past several decades has made it Antarctica’s largest contributor to sea-level rise. The past speedup is largely due to grounding-line retreat in response to ocean-induced thinning that reduced ice-shelf buttressing. While speeds remained fairly steady from 2009 to late 2017, our Copernicus Sentinel 1A/B–derived velocity data show a >12% speedup over the past 3 years, coincident with a 19-km retreat of the ice shelf. We use an ice-flow model to simulate this loss, finding that accelerated calving can explain the recent speedup, independent of the grounding-line, melt-driven processes responsible for past speedups. If the ice shelf’s rapid retreat continues, it could further destabilize the glacier far sooner than would be expected due to surface- or ocean-melting processes. ....

United Kingdom , M Morlighem Bedmachine , Polar Geospatial Center Worldview , National Capability Science Single Centre , German Space Agency , National Science Foundation , National Aeronautics Space Administration , Star Programme , United Kingdom Natural Environment Research Council , Pine Island Glacier , Copernicus Sentinel , Thwaites Glacier , West Antarctic Ice Sheet , Bedmachine Antarctica Version , Creative Commons Attribution , Operation Icebridge , Polar Geospatial Center , ஒன்றுபட்டது கிஂக்டம் , தேசிய அறிவியல் அடித்தளம் , நட்சத்திரம் ப்ரோக்ராம் , ஒன்றுபட்டது கிஂக்டம் இயற்கை சூழல் ஆராய்ச்சி சபை , பைன் தீவு பனிப்பாறை , கோப்பர்நிக்கஸ் செண்டினல் , மேற்கு அண்டார்டிக் பனி தாள் , செயல்பாடு பனிக்கட்டி , போலார் புவிசார் மையம் ,

A Massive Study of Nearly Every Glacier on Earth Just Revealed a Devastating Trend

A Massive Study of Nearly Every Glacier on Earth Just Revealed a Devastating Trend
NICOLETTA LANESE, LIVE SCIENCE
29 APRIL 2021
Earth s glaciers are shrinking, and in the past 20 years, the rate of shrinkage has steadily sped up, according to a new study of nearly every glacier on the planet.
Glaciers mostly lose mass through ice melt, but they also shrink due to other processes, such as sublimation, where water evaporates directly from the ice, and calving, where large chunks of ice break off the edge of a glacier, according to the National Oceanic and Atmospheric Administration (NOAA).

By tracking how quickly glaciers are shrinking, scientists can better predict how quickly sea levels may rise, particularly as climate change drives up average global temperatures. ....

United States , Romain Hugonnet , Intergovernmental Panel On Climate Change , National Oceanic , Atmospheric Administration , Laboratory Of Hydraulics , University Of Toulouse , Spaceborne Thermal Emission , Reflection Radiometer , Intergovernmental Panel , Climate Change , Elevation Satellite , Operation Icebridge , North America , Mp Quot , ஒன்றுபட்டது மாநிலங்களில் , இடை அரசு குழு ஆன் காலநிலை மாற்றம் , தேசிய கடல் , ஆய்வகம் ஆஃப் ஹைட்ராலிக்ஸ் , பல்கலைக்கழகம் ஆஃப் டவுலஸ் , இடை அரசு குழு , காலநிலை மாற்றம் , உயரம் செயற்கைக்கோள் , செயல்பாடு பனிக்கட்டி , வடக்கு அமெரிக்கா ,

Earth's Cryosphere Is Vital for Everyone. Here's How NASA Keeps Track of Its Changes. – Climate Change: Vital Signs of the Planet

In Brief:
Due to ice s important role in the Earth system, NASA is committed to studying it extensively.
Everything on our planet the land, the water, the air, people is connected by the various chemical, physical and biological processes that make up what we call the Earth system.
One of the key components of that huge system is the cryosphere, or all of Earth’s frozen water. This important “sphere” includes frozen soils in Alaska, the snow on top of the Himalayas, as well as all the ice in the polar regions.
Nowhere is the role of the cryosphere as evident as it is at high latitudes, where the Greenland and Antarctic ice sheets cover most of the land, and where sea ice caps enormous sections of the polar waters. The vastness of that bright, white ice in addition to the huge areas covered by winter snow beyond polar regions helps control the global climate by reflecting some of the Sun’s radiation back into space. ....

United States , Sierra Nevada , Kellen Gray , Goddard Space Flight Center , Goddard Space Flight Center Joy Ng , Earth Science News Team , Goddard Space Flight Centerk Ramsayer , High Mountain Asia Team , Roberto Molar Candanosa , Gravity Recovery , Climate Experiment , Operation Icebridge , Elevation Satellites , Greenland Ice Sheet , Space Flight Center , Antarctic Peninsula , Space Flight , Melting Greenland , Beaufort Gyre , Atlantic Meridional Overturning Circulation , Western Europe , Great Conveyor Belt , Grand Mesa , Colorado Rockies , Mountain Asia Team , Hindu Kush ,

Emotional Appeal: How Art Can Inspire Action on Climate Change | Lamont-Doherty Earth Observatory

April 20, 2021
By Elise Gout
In honor of Earth Day on April 22, the Earth Institute has a variety of great stories and events lined up for you throughout the entire month of April. Learn more.
Whale Bay, Antarctica No. 4, 2016. Zaria Forman uses soft pastels to recreate undeveloped landscapes that are increasingly at risk to climate change. “I was looking for something more meaningful to imbue in my work, something that was more than just a pretty picture for somebody’s wall,” she said. Image courtesy of Zaria Forman
It was on a trip to Greenland that artist Zaria Forman first grasped the urgency of the climate crisis. She was traveling with her family and, having never been to a polar region before, planned to use the landscape as inspiration for her work. The hotel they were staying at was bustling, not with tourists, but with government officials, newscasters, and scientists all there to study the Greenland ice sheet. In 2007, most media outlets in ....

United States , Mount Whitney , James Prosek Sermeq Kajalleq , Caroline Juang , Sermeq Kajalleq , Zaria Forman , James Prosek , Yellowstone National Park , Columbia University Department Of Earth , Earth Institute , Earth Day , Whale Bay , Mana Contemporary , Euphrates River , Operation Icebridge , Jeff Frost , Pale Blue Dot , Columbia University , Environmental Science , Lamont Doherty Earth , ஒன்றுபட்டது மாநிலங்களில் , ஏற்ற விட்னி , ஜரியா ஆடவருக்கான , மஞ்சள் கல் தேசிய பூங்கா , கொலம்பியா பல்கலைக்கழகம் துறை ஆஃப் பூமி , பூமி நிறுவனம் ,

NASA finds what a glacier's slope reveals about Greenland Ice Sheet thinning

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IMAGE: GIF showing the potential distances over which thinning can spread into Greenland s interior. Glaciers in regions of higher elevation, tend to pervade less inland than those in regions of lower.
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Credit: Credits: Denis Felikson
As glaciers flow outward from the Greenland Ice Sheet, what lies beneath them offers clues to their role in future ice thinning and sea-level rise contribution.
Outlet glaciers are rivers of ice flowing within the cracks of the bedrock and draining into the surrounding sea. They retreat and start to thin as climate warms, and this thinning works its way toward the center of the ice sheet. Now, by looking at the bed topography beneath the ice, scientists have a better understanding of which glaciers could have a significant impact on the Greenland Ice Sheet s contribution to sea-level rise in coming years. They found that some glaciers flowing over gentler slopes could have a greater impact than previo ....

United States , Goddard Space Flight Center , Denis Felikson , Geophysical Research Letters , University Of Texas , Universities Space Research Association , Greenland Ice Sheet , Space Flight Center , Greenland Ice Mapping Project , Spaceborne Thermal Emission , Reflection Radiometer , Elevation Satellite , Operation Icebridge , ஒன்றுபட்டது மாநிலங்களில் , கோடார்ட் இடம் விமானம் மையம் , புவி இயற்பியல் ஆராய்ச்சி எழுத்துக்கள் , பல்கலைக்கழகம் ஆஃப் டெக்சாஸ் , பல்கலைக்கழகங்கள் இடம் ஆராய்ச்சி சங்கம் , கிரீன்லாந்து பனி தாள் , இடம் விமானம் மையம் , கிரீன்லாந்து பனி விவரணையாக்கம் ப்ராஜெக்ட் , உயரம் செயற்கைக்கோள் , செயல்பாடு பனிக்கட்டி ,