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Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Almost a quarter of ice in West Antarctic is now unstable – ScienceDaily

Almost a quarter of ice in West Antarctic is now unstable – ScienceDaily



By combining 25 years of satellite space measurements of the European Space Agency and a regional climate model, the UK Center for Polar Observation and Modeling (CPOM) is tracking changes in snow and ice cover across the continent.

researchers, led by Professor Andy Shepherd from the University of Leeds, found that the ice of Antarctica was thinning up to 122 meters in areas, with the fastest change occurring in West Antarctica where melting The ocean triggers glacier imbalance.

means that the affected glaciers are unstable because they lose more mass by digestion and dissemination of ice than they get through the snowfall.

The team discovered that the glacier thinning pattern was not static. Since 1

992, irritability has spread to 24% of West Antarctica and is more than most of its biggest ice streams – Pine Island and Thwaites Glaciers – now losing ice five times faster than they started the survey .

The study is now published in the Geophysical Research Setters used in over 800 million metric tons of ice in Antarctica recorded by ERS-1, ERS-2, Envisat, and CryoSat-2 satellite altimeter mission between 1992 and 2017 and snowfall simulations at the same time made by RACMO regional climate model.

Together, measurements allow changes to the height of the ice sheet to be separated from those due to weather patterns, such as lower snowfall, and those due to longer climate change, such as increasing the temperature of the ice-eating ocean.

The author of the lead and Professor of CPOM Professor Andy Shepherd explains: "In parts of Antarctica ice ice is thinner than extraordinary amounts, and so we set out to show how much for climate change and how much due to the weather. "

To do this, the team compared to the measured surface surface changes the simulated snowfall change, and where the difference is the greater they relate to the origin its in the glacier weight loss.

They discovered that snowfall changes tend to bring small changes in height to large areas for several years at a time, but the most pronounced changes in ice thickness are signs [38] Professor Shepherd added: "Knowing how much snowfall has actually helped us to discover the underlying glacier changes in the satellite record. Clearly we now see that a wave of thinning is rapidly spreading to some of the most vulnerable glaciers of Antarctica, and their losses run at sea levels across the planet.

"In total, ice losses from the East and West Antarctica contributed 4.6 mm to the global sea rise ever since 1992. "

Dr. Marcus Engdahl of the European Space Agency, a co-author of the study, added:" It's an important p see how satellite satellites can help us understand how our planet is. Consequently, space viewing is an important tool for monitoring the effects of climate change. "

Source:

Material provided by University of Leeds . Note: Content can be edited for style and length.


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