Four decades of Antarctic Ice Sheet mass balance from 1979-2017.
Antarctica
climate change
glaciology
remote sensing
sea-level rise
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
22 01 2019
22 01 2019
Historique:
pubmed:
16
1
2019
medline:
16
1
2019
entrez:
16
1
2019
Statut:
ppublish
Résumé
We use updated drainage inventory, ice thickness, and ice velocity data to calculate the grounding line ice discharge of 176 basins draining the Antarctic Ice Sheet from 1979 to 2017. We compare the results with a surface mass balance model to deduce the ice sheet mass balance. The total mass loss increased from 40 ± 9 Gt/y in 1979-1990 to 50 ± 14 Gt/y in 1989-2000, 166 ± 18 Gt/y in 1999-2009, and 252 ± 26 Gt/y in 2009-2017. In 2009-2017, the mass loss was dominated by the Amundsen/Bellingshausen Sea sectors, in West Antarctica (159 ± 8 Gt/y), Wilkes Land, in East Antarctica (51 ± 13 Gt/y), and West and Northeast Peninsula (42 ± 5 Gt/y). The contribution to sea-level rise from Antarctica averaged 3.6 ± 0.5 mm per decade with a cumulative 14.0 ± 2.0 mm since 1979, including 6.9 ± 0.6 mm from West Antarctica, 4.4 ± 0.9 mm from East Antarctica, and 2.5 ± 0.4 mm from the Peninsula (i.e., East Antarctica is a major participant in the mass loss). During the entire period, the mass loss concentrated in areas closest to warm, salty, subsurface, circumpolar deep water (CDW), that is, consistent with enhanced polar westerlies pushing CDW toward Antarctica to melt its floating ice shelves, destabilize the glaciers, and raise sea level.
Identifiants
pubmed: 30642972
pii: 1812883116
doi: 10.1073/pnas.1812883116
pmc: PMC6347714
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Pagination
1095-1103Informations de copyright
Copyright © 2019 the Author(s). Published by PNAS.
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
Références
Sci Rep. 2018 Mar 14;8(1):4477
pubmed: 29540750
Nature. 2018 Jun;558(7709):219-222
pubmed: 29899482
Sci Adv. 2016 Dec 16;2(12):e1601610
pubmed: 28028540
Nature. 2012 Jul 25;487(7408):468-71
pubmed: 22837002
Science. 2013 Jul 19;341(6143):266-70
pubmed: 23765278
Science. 2012 Nov 30;338(6111):1183-9
pubmed: 23197528
Nature. 2017 Jan 5;541(7635):77-80
pubmed: 27880756
Science. 2011 Sep 9;333(6048):1427-30
pubmed: 21852457
Science. 2016 Jul 15;353(6296):283-6
pubmed: 27418507
Sci Adv. 2017 Nov 01;3(11):e1701681
pubmed: 29109976
Proc Natl Acad Sci U S A. 2015 Mar 17;112(11):3263-8
pubmed: 25733856
Science. 2015 May 22;348(6237):899-903
pubmed: 25999505
Science. 2014 Jan 10;343(6167):174-8
pubmed: 24385606