Instantaneous Antarctic ice-sheet mass loss driven by thinning ice shelves

G. Hilmar Gudmundsson, Fernando S. Paolo, Susheel Adusumilli, Helen A. Fricker

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)
31 Downloads (Pure)

Abstract

Recent observations show that the rate at which the Antarctic ice sheet (AIS) is contributing to sea level rise is increasing. Increases in ice-ocean heat exchange have the potential to induce substantial mass loss through the melting of its ice shelves. Lack of data and limitations in modeling, however, has made it challenging to quantify the importance of ocean-induced changes in ice shelf thickness as a driver for ongoing mass loss. Here, we use a numerical ice sheet model in combination with satellite observations of ice shelf thinning from 1994 to 2017 to quantify instantaneous changes in ice flow across all AIS grounding lines, resulting from changes in ice shelf buttressing alone. Our process-based predictions are in good agreement with observed spatial patterns of ice loss, providing support for the notion that a significant portion of the current ice loss of the AIS is ocean driven and caused by a reduction in ice shelf buttressing.

Original languageEnglish
Pages (from-to)13903-13909
Number of pages7
JournalGeophysical Research Letters
Volume46
Issue number23
Early online date11 Dec 2019
DOIs
Publication statusPublished - 16 Dec 2019

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