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Antarctic Ice Sheet melting in the southeast Pacific
Author(s) -
Jacobs Stanley S.,
Hellmer Hartmut H.,
Jenkins Adrian
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl00723
Subject(s) - geology , ice shelf , circumpolar deep water , ice sheet , oceanography , iceberg , antarctic ice sheet , antarctic sea ice , ice stream , sea ice , lead (geology) , arctic ice pack , glacier , cryosphere , climatology , north atlantic deep water , geomorphology , deep water
The first oceanographic measurements across a deep channel beneath the calving front of Pine Island Glacier reveal a sub‐ice circulation driven by basal melting of 10–12 m yr −1 . A salt box model described here gives a melt rate similar to that of ice balance and numerical models, 5–50 times higher than averages for the George VI and Ross Ice Shelves. Melting is fueled by relatively warm Circumpolar Deep Water that floods the deep floor of the Amundsen and Bellingshausen Sea continental shelves, reaching the deep draft of this floating glacier. A revised melt rate for ice shelves in the Southeast Pacific sector raises circumpolar ice shelf melting to 756 Gt yr −1 . Given prior estimates of surface accumulation and iceberg calving, this suggests that the Antarctic Ice Sheet is currently losing mass to the ocean.