The 2020 Larsen C Ice Shelf surface melt is a 40-year record high

Bevan, Suzanne; Luckman, Adrian; Hendon, Harry; Wang, Guomin

doi:10.5194/tc-14-3551-2020

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The 2020 Larsen C Ice Shelf surface melt is a 40-year record high

Suzanne Bevan

, Adrian Luckman

, Harry Hendon, Guomin Wang

The Cryosphere, Volume: 14, Issue: 10, Pages: 3551 - 3564

Swansea University Authors: Suzanne Bevan , Adrian Luckman

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DOI (Published version): 10.5194/tc-14-3551-2020

Abstract

Along with record-breaking summer air temperatures at an Antarctic Peninsula meteorological station in February 2020, the Larsen C ice shelf experienced an exceptionally long and extensive 2019/2020 melt season. We use a 40-year time series of passive and scatterometer satellite microwave data, whic...

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Published in:	The Cryosphere
ISSN:	1994-0424
Published:	Copernicus GmbH 2020
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa55459
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first_indexed	2020-10-20T09:15:52Z
last_indexed	2023-03-10T04:02:47Z
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spelling	2023-03-09T13:28:12.4991607 v2 55459 2020-10-20 The 2020 Larsen C Ice Shelf surface melt is a 40-year record high 758d19253522c8c306d4eea0e6e484f6 0000-0003-2649-2982 Suzanne Bevan Suzanne Bevan true false 008cb668b2671b653a88677f075799a9 0000-0002-9618-5905 Adrian Luckman Adrian Luckman true false 2020-10-20 SGE Along with record-breaking summer air temperatures at an Antarctic Peninsula meteorological station in February 2020, the Larsen C ice shelf experienced an exceptionally long and extensive 2019/2020 melt season. We use a 40-year time series of passive and scatterometer satellite microwave data, which are sensitive to the presence of liquid water in the snow pack, to reveal that the extent and duration of melt observed on the ice shelf in the austral summer of 2019/2020 was the greatest on record. We find that unusual perturbations to Southern Hemisphere modes of atmospheric flow, including a persistently positive Indian Ocean Dipole in the spring and a very rare Southern Hemisphere sudden stratospheric warming in September 2019, preceded the exceptionally warm Antarctic Peninsula summer. It is likely that teleconnections between the tropics and southern high latitudes were able to bring sufficient heat via the atmosphere and ocean to the Antarctic Peninsula to drive the extreme Larsen C Ice Shelf melt. The record-breaking melt of 2019/2020 brought to an end the trend of decreasing melt that had begun in 1999/2000, will reinitiate earlier thinning of the ice shelf by depletion of the firn air content, and probably affected a much greater region than Larsen C Ice Shelf. Journal Article The Cryosphere 14 10 3551 3564 Copernicus GmbH 1994-0424 27 10 2020 2020-10-27 10.5194/tc-14-3551-2020 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University External research funder(s) paid the OA fee (includes OA grants disbursed by the Library) This research has been supported by the Natural Environment Research Council (grant no. NE/L005409/1). 2023-03-09T13:28:12.4991607 2020-10-20T10:00:30.5716533 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Suzanne Bevan 0000-0003-2649-2982 1 Adrian Luckman 0000-0002-9618-5905 2 Harry Hendon 3 Guomin Wang 4 55459__18515__37dc699a0576437f8748ba1c2af2308b.pdf tc-14-3551-2020.pdf 2020-10-28T07:54:57.8708753 Output 10929197 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 License. true eng https://creativecommons.org/licenses/by/4.0/ 29 Dr Suzanne Bevan 0000-0003-2649-2982 s.l.bevan@swansea.ac.uk true https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01014 false 30 Suzanne Bevan 0000-0003-2649-2982 s.l.bevan@swansea.ac.uk true https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01318 false
title	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
spellingShingle	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high Suzanne Bevan Adrian Luckman
title_short	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
title_full	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
title_fullStr	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
title_full_unstemmed	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
title_sort	The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
author_id_str_mv	758d19253522c8c306d4eea0e6e484f6 008cb668b2671b653a88677f075799a9
author_id_fullname_str_mv	758d19253522c8c306d4eea0e6e484f6_*_Suzanne Bevan 008cb668b2671b653a88677f075799a9_*_Adrian Luckman
author	Suzanne Bevan Adrian Luckman
author2	Suzanne Bevan Adrian Luckman Harry Hendon Guomin Wang
format	Journal article
container_title	The Cryosphere
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container_issue	10
container_start_page	3551
publishDate	2020
institution	Swansea University
issn	1994-0424
doi_str_mv	10.5194/tc-14-3551-2020
publisher	Copernicus GmbH
college_str	Faculty of Science and Engineering
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description	Along with record-breaking summer air temperatures at an Antarctic Peninsula meteorological station in February 2020, the Larsen C ice shelf experienced an exceptionally long and extensive 2019/2020 melt season. We use a 40-year time series of passive and scatterometer satellite microwave data, which are sensitive to the presence of liquid water in the snow pack, to reveal that the extent and duration of melt observed on the ice shelf in the austral summer of 2019/2020 was the greatest on record. We find that unusual perturbations to Southern Hemisphere modes of atmospheric flow, including a persistently positive Indian Ocean Dipole in the spring and a very rare Southern Hemisphere sudden stratospheric warming in September 2019, preceded the exceptionally warm Antarctic Peninsula summer. It is likely that teleconnections between the tropics and southern high latitudes were able to bring sufficient heat via the atmosphere and ocean to the Antarctic Peninsula to drive the extreme Larsen C Ice Shelf melt. The record-breaking melt of 2019/2020 brought to an end the trend of decreasing melt that had begun in 1999/2000, will reinitiate earlier thinning of the ice shelf by depletion of the firn air content, and probably affected a much greater region than Larsen C Ice Shelf.
published_date	2020-10-27T04:09:40Z
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score	11.013148

The 2020 Larsen C Ice Shelf surface melt is a 40-year record high

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