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

• Published in: Geophysical Research Letters
• Main Authors: Gudmundsson, Hilmar, Paolo, Fernando S., Adusumilli, Susheel, Fricker, Helen A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union 2019
• Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences; Antarctic; The Antarctic; Antarc*; Ice Sheet; Ice Shelf; Ice Shelves
• Online Access: https://nrl.northumbria.ac.uk/id/eprint/41615/; https://doi.org/10.1029/2019GL085027; https://nrl.northumbria.ac.uk/id/eprint/41615/17/2019GL085027.pdf; https://nrl.northumbria.ac.uk/id/eprint/41615/9/Gudmundsson_et_al-2019-Geophysical_Research_Letters.pdf; https://nrl.northumbria.ac.uk/id/eprint/41615/1/Gudmundsson_et_al-2019-Geophysical_Research_Letters%20%282%29.pdf

Abstract Recent observations show that the rate at which the Antarctic Ice Sheet (AIS) is contributing to sea level rise is increasing. Increasing ice-ocean heat exchange has the potential to induce substantial mass loss through the melting of its ice shelves. Lack of data and limitations in modelling, however, have 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.