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Progressive unanchoring of Antarctic ice shelves since 1973

Mass loss of the Antarctic Ice Sheet has been driven primarily by the thinning of the floating ice shelves that fringe the ice sheet1, reducing their buttressing potential and causing land ice to accelerate into the ocean2. Observations of ice-shelf thickness change by satellite altimetry stretch back only to 1992 (refs. 1,3–5) and previous information about thinning remains unquantified. However, extending the record of ice-shelf thickness change is possible by proxy, by measuring the change in area of the surface expression of pinning points—local bathymetric highs on which ice shelves are anchored6. Here we measure pinning-point change over three epochs spanning the periods 1973–1989, 1989–2000 and 2000−2022, and thus by proxy infer changes to ice-shelf thickness back to 1973–1989. We show that only small localized pockets of ice shelves were thinning between 1973 and 1989, located primarily in the Amundsen Sea Embayment and the Wil ....

Amundsen Sea , Oceans General , Dronning Maud , Bellingshausen Sea , Weddell Sea , Moscow University , Us Geological , Moscow University Glacier , Moscow University Ice Shelf , Extended Data , Amundsen Sea Embayment , West Antarctica , East Antarctica , Antarctic Peninsula , Prince Gustav , Bawden Ice Rise , Supplementary Information , Amundsen Sea Sector , Pine Island Glacier , Getz Ice Shelf , Marie Byrd Land , Hull Glacier , Sulzberger Ice Shelf , Swinburne Ice Shelf , Ross Ice Shelf , Steershead Ice Rise ,

These are the most popular Science News stories of 2023

Science News drew over 21 million visitors to our website this year. Here’s a look back at the most-read and most-watched stories of 2023. ....

United States , Jon Nelson , Science News , West Antarctic , Kamb Ice Stream , West Antarctica ,

Underwater robot updates understanding of ice shelf crevasses

Crevasses play an important role in circulating seawater beneath Antarctic ice shelves, potentially influencing their stability, finds Cornell-led research based on first-of-its-kind exploration by an underwater robot. ....

Justin Lawrence , Zealand Antarctic , Britney Schmidt Icefin , Christina Hulbe , Enrica Quartini , Matthew Meister , Benjamin Hurwitz , Cornell Icefin , Peter Washam , Britney Schmidt , Andrew Mullen , Frances Bryson , Cornell Center , College Of Arts , University Of Otago , Lanalog Research , Technology Lab , Us Antarctic Program , Georgia Institute Of Technology , Victoria University Of Wellington Hot Water Drilling , Zealand Antarctic Research Institute , National Science Foundation , Department Of Astronomy , Ross Ice Shelf , Kamb Ice Stream , Ocean Circulation ,

Icefin Robot Reports on The Crucial Role of Crevasses in Antarctic Ice Shelf Stability

Crevasses, as discovered through groundbreaking research led by Cornell, are not just fissures in the ice; they serve a crucial function in the circulation of seawater beneath Antarctic ice shelves. ....

Skyla Baily , Zealand Antarctic , Christina Hulbe , Schmidt Lawrence , Enrica Quartini , Peter Washam , Justin Lawrence , Cornell Icefin , Matthew Meister , Britney Schmidt , Benjamin Hurwitz , Cornell Center , National Science Foundation , Victoria University Of Wellington Hot Water Drilling , Research Scientist , Technology Lab , Georgia Institute Of Technology , Us Antarctic Program , University Of Otago , Zealand Antarctic Research Institute , Cornell University , Senior Research Engineer Andrew Mullen , College Of Arts , Lanalog Research , Research Engineer Frances Bryson , Department Of Astronomy ,

Robot Enhances Knowledge of Ice Shelf Crevasses Underwater

Robot Enhances Knowledge of Ice Shelf Crevasses Underwater
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Benjamin Hurwitz , Britney Schmidt Icefin , Matthew Meister , Peter Washam , Christina Hulbe , Britney Schmidt , Cornell Icefin , Enrica Quartini , Andrew Mullen , Zealand Antarctic , Justin Lawrence , Frances Bryson , College Of Arts , Georgia Institute Of Technology , Us Antarctic Program , Victoria University Of Wellington Hot Water Drilling , National Science Foundation , Cornell Center , Zealand Antarctic Research Institute , Department Of Astronomy , Technology Lab , Lanalog Research , University Of Otago , Ross Ice Shelf , Kamb Ice Stream , Ocean Circulation ,