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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 ,

"The Extraordinary March 2022 East Antarctica "Heat" Wave. Part II: Imp" by Jonathan D. Wille, Simon P. Alexander et al.

Between 15 and 19 March 2022, East Antarctica experienced an exceptional heat wave with widespread 308–408C temperature anomalies across the ice sheet. In Part I, we assessed the meteorological drivers that generated an intense atmospheric river (AR) that caused these record-shattering temperature anomalies. Here, we continue our large collaborative study by analyzing the widespread and diverse impacts driven by the AR landfall. These impacts included widespread rain and surface melt that was recorded along coastal areas, but this was outweighed by widespread high snowfall accumulations resulting in a largely positive surface mass balance contribution to the East Antarctic region. An analysis of the surface energy budget indicated that widespread downward longwave radiation anomalies caused by large cloud-liquid water contents along with some scattered solar radiation produced intense surface warming. Isotope measurements of the moisture were highly elevated, likely imprinting a stro ....

East Antarctica , East Antarctic , Conger Ice Shelf , Nergy Budget Balance , Pice Shelves ,

Scientists Fully Decipher Antarctica's Largest Heatwave

Scientists Fully Decipher Antarctica's Largest Heatwave
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United States , Indian Ocean , Jonathand Wille , Elisabeth Schlosser , Department Of Atmospheric , Cryospheric Sciences , American Meteorological Society Journal Of Climate , American Meteorological Society , Concordia Station , East Antarctica , Antarctic Ice , Conger Ice Shelf , Antarctic Ice Sheet , West Antarctica , Extraordinary March , Meteorological Drivers ,

Scientists explain Antarctica's raving 2022 heatwave in groundbreaking papers

Scientists explain Antarctica's raving 2022 heatwave in groundbreaking papers
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Indian Ocean , Jonathan Wille , East Antarctica , Conger Ice Shelf , Concordia Research , West Antarctic ,