Antarctic ice sheet melting in the southeast Pacific

• Published in: Geophysical Research Letters
• Main Authors: Jacobs, Stanley S., Hellmer, Hartmut H., Jenkins, Adrian
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Geophysical Union 1996
• Subjects: Antarctic; The Antarctic; Bellingshausen Sea; Pacific; Pine Island Glacier; Antarc*; Ice Sheet; Ice Shelf; Ice Shelves; Iceberg*
• Online Access: http://nora.nerc.ac.uk/id/eprint/515160/; https://doi.org/10.1029/96GL00723

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.