Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018

Selley, Heather L.; Hogg, Anna E.; Cornford, Stephen; Dutrieux, Pierre; Shepherd, Andrew; Wuite, Jan; Floricioiu, Dana; Kusk, Anders; Nagler, Thomas; Gilbert, Lin; Slater, Thomas; Kim, Tae-Wan

doi:10.1038/s41467-021-21321-1

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Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018

Heather L. Selley, Anna E. Hogg, Stephen Cornford

, Pierre Dutrieux, Andrew Shepherd, Jan Wuite, Dana Floricioiu, Anders Kusk, Thomas Nagler, Lin Gilbert, Thomas Slater, Tae-Wan Kim

Nature Communications, Volume: 12, Issue: 1, Start page: 1133

Swansea University Author: Stephen Cornford

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DOI (Published version): 10.1038/s41467-021-21321-1

Abstract

The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we use satellite observations and an ice sheet model to measure the change in ice speed and mass balance of the drainage basin over the last 25-years. Our results show a mean...

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Published in:	Nature Communications
ISSN:	2041-1723
Published:	Springer Science and Business Media LLC 2021
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa56308

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spelling	2025-01-15T13:49:59.4839164 v2 56308 2021-02-23 Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018 17ae00ff2346b8c23d7e2b34341610a4 0000-0003-1844-274X Stephen Cornford Stephen Cornford true false 2021-02-23 BGPS The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we use satellite observations and an ice sheet model to measure the change in ice speed and mass balance of the drainage basin over the last 25-years. Our results show a mean increase in speed of 23.8 % between 1994 and 2018, with three glaciers accelerating by over 44 %. Speedup across the Getz basin is linear, with speedup and thinning directly correlated confirming the presence of dynamic imbalance. Since 1994, 315 Gt of ice has been lost contributing 0.9 ± 0.6 mm global mean sea level, with increased loss since 2010 caused by a snowfall reduction. Overall, dynamic imbalance accounts for two thirds of the mass loss from this region of West Antarctica over the past 25-years, with a longer-term response to ocean forcing the likely driving mechanism. Journal Article Nature Communications 12 1 1133 Springer Science and Business Media LLC 2041-1723 23 2 2021 2021-02-23 10.1038/s41467-021-21321-1 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee This work was led by the School of Earth and Environment at the University of Leeds, with support from the NERC Centre for Polar Observation and Modelling (CPOM300001). The authors gratefully acknowledge the ESA, the National Aeronautics and Space Administration, the Japan Aerospace Exploration Agency and the Canadian Space Agency for the acquisition of ERS-1 and -2 (C1P9925), Sentinel-1, Landsat-8, ALOS PALSAR and RADARSAT data, respectively. We acknowledge the use of datasets produced through the ESA Antarctic Ice Sheet Climate Change Initiative (AIS_CCI) project and the NASA Measures programme for funding the development of long-term climate data records from satellite observations. Anna E. Hogg was supported by the NERC DeCAdeS project (NE/T012757/1) and ESA Polar+ Ice Shelves project (ESA-IPL-POE-EF-cb-LE-2019-834). Pierre Dutrieux was supported by NSF awards 1643285, 1644159, and a Columbia University Climate and Life Fellowship. Tae-Wan Kim from the Korea Polar Research Institute, grant KOPRI PE20160. 2025-01-15T13:49:59.4839164 2021-02-23T14:03:06.4650291 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Heather L. Selley 1 Anna E. Hogg 2 Stephen Cornford 0000-0003-1844-274X 3 Pierre Dutrieux 4 Andrew Shepherd 5 Jan Wuite 6 Dana Floricioiu 7 Anders Kusk 8 Thomas Nagler 9 Lin Gilbert 10 Thomas Slater 11 Tae-Wan Kim 12 56308__19469__0e4bf6bdae6a46cc91b36779ec6d80b3.pdf 56308.pdf 2021-03-10T17:49:35.7495457 Output 3718501 application/pdf Version of Record true © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License true eng http://creativecommons.org/licenses/by/4.0/
title	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018
spellingShingle	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018 Stephen Cornford
title_short	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018
title_full	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018
title_fullStr	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018
title_full_unstemmed	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018
title_sort	Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018
author_id_str_mv	17ae00ff2346b8c23d7e2b34341610a4
author_id_fullname_str_mv	17ae00ff2346b8c23d7e2b34341610a4_***_Stephen Cornford
author	Stephen Cornford
author2	Heather L. Selley Anna E. Hogg Stephen Cornford Pierre Dutrieux Andrew Shepherd Jan Wuite Dana Floricioiu Anders Kusk Thomas Nagler Lin Gilbert Thomas Slater Tae-Wan Kim
format	Journal article
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container_volume	12
container_issue	1
container_start_page	1133
publishDate	2021
institution	Swansea University
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description	The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we use satellite observations and an ice sheet model to measure the change in ice speed and mass balance of the drainage basin over the last 25-years. Our results show a mean increase in speed of 23.8 % between 1994 and 2018, with three glaciers accelerating by over 44 %. Speedup across the Getz basin is linear, with speedup and thinning directly correlated confirming the presence of dynamic imbalance. Since 1994, 315 Gt of ice has been lost contributing 0.9 ± 0.6 mm global mean sea level, with increased loss since 2010 caused by a snowfall reduction. Overall, dynamic imbalance accounts for two thirds of the mass loss from this region of West Antarctica over the past 25-years, with a longer-term response to ocean forcing the likely driving mechanism.
published_date	2021-02-23T04:53:30Z
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Widespread increase in dynamic imbalance in the Getz region of Antarctica from 1994 to 2018

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