Trends in Antarctic Ice Sheet Elevation and Mass

Fluctuations in Antarctic Ice Sheet elevation and mass occur over a variety of timescales, owing to changes in snowfall and ice flow. Here, we disentangle these signals by combining 25 years of satellite radar altimeter observations and a regional climate model. From these measurements, patterns of...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Shepherd, Andrew, Gilbert, Lin, Muir, Alan, Konrad, Hannes, McMillan, Mal, Slater, Thomas, Briggs, Kate, Sundal, Aud V., Hogg, Anna E., Engdahl, Marcus
Format: Article in Journal/Newspaper
Language:unknown
Published: 2019
Subjects:
Antarctic
Thwaites Glacier
West Antarctica
Antarc*
Antarctica
Ice Sheet
Pine Island
Online Access:https://eprints.lancs.ac.uk/id/eprint/135311/
https://doi.org/10.1029/2019GL082182
Description
Summary:Fluctuations in Antarctic Ice Sheet elevation and mass occur over a variety of timescales, owing to changes in snowfall and ice flow. Here, we disentangle these signals by combining 25 years of satellite radar altimeter observations and a regional climate model. From these measurements, patterns of change that are strongly associated with glaciological events emerge. While the majority of the ice sheet has remained stable, 24% of West Antarctica is now in a state of dynamical imbalance. Thinning of the Pine Island and Thwaites glacier basins reaches 122 m in places, and their rates of ice loss are now five times greater than at the start of our survey. By partitioning elevation changes into areas of snow and ice variability, we estimate that East and West Antarctica have contributed ‐1.1±0.4 and +5.7±0.8 mm to global sea level between 1992 and 2017.

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