气候变化领域集成服务门户(CCPortal): Glacier change along West Antarctica's Marie Byrd Land Sector and links to inter-decadal atmosphere-ocean variability

CCPortal

DOI	10.5194/tc-12-2461-2018
	Glacier change along West Antarctica's Marie Byrd Land Sector and links to inter-decadal atmosphere-ocean variability
	Christie F.D.W.; Bingham R.G.; Gourmelen N.; Steig E.J.; Bisset R.R.; Pritchard H.D.; Snow K.; Tett S.F.B.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	Over the past 20 years satellite remote sensing has captured significant downwasting of glaciers that drain the West Antarctic Ice Sheet into the ocean, particularly across the Amundsen Sea Sector. Along the neighbouring Marie Byrd Land Sector, situated west of Thwaites Glacier to Ross Ice Shelf, glaciological change has been only sparsely monitored. Here, we use optical satellite imagery to track grounding-line migration along the Marie Byrd Land Sector between 2003 and 2015, and compare observed changes with ICESat and CryoSat-2-derived surface elevation and thickness change records. During the observational period, 33 % of the grounding line underwent retreat, with no significant advance recorded over the remainder of the ~2200 km long coastline. The greatest retreat rates were observed along the 650 km-long Getz Ice Shelf, further west of which only minor retreat occurred. The relative glaciological stability west of Getz Ice Shelf can be attributed to a divergence of the Antarctic Circumpolar Current from the continental-shelf break at 135° W, coincident with a transition in the morphology of the continental shelf. Along Getz Ice Shelf, grounding-line retreat reduced by 68 % during the CryoSat-2 era relative to earlier observations. Climate reanalysis data imply that wind-driven upwelling of Circumpolar Deep Water would have been reduced during this later period, suggesting that the observed slowdown was a response to reduced oceanic forcing. However, lack of comprehensive oceanographic and bathymetric information proximal to Getz Ice Shelf's grounding zone make it difficult to assess the role of intrinsic glacier dynamics, or more complex ice-sheet-ocean interactions, in moderating this slowdown. Collectively, our findings underscore the importance of spatial and inter-decadal variability in atmosphere and ocean interactions in moderating glaciological change around Antarctica. © 2018 Copernicus GmbH. All rights reserved.
学科领域	atmosphere-ocean system; CryoSat; decadal variation; elevation; glacier dynamics; glacier retreat; grounding line; ICESat; remote sensing; satellite imagery; upwelling; Amundsen Sea; Antarctic Circumpolar Current; Antarctic Ice Sheet; Antarctic Ice Sheet; Antarctica; Getz Ice Shelf; Marie Byrd Land; Southern Ocean; Thwaites Glacier; West Antarctic Ice Sheet; West Antarctica
语种	英语
scopus关键词	atmosphere-ocean system; CryoSat; decadal variation; elevation; glacier dynamics; glacier retreat; grounding line; ICESat; remote sensing; satellite imagery; upwelling; Amundsen Sea; Antarctic Circumpolar Current; Antarctic Ice Sheet; Antarctic Ice Sheet; Antarctica; Getz Ice Shelf; Marie Byrd Land; Southern Ocean; Thwaites Glacier; West Antarctic Ice Sheet; West Antarctica
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119094
作者单位	School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, United Kingdom; Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, United States; NERC British Antarctic Survey, Cambridge, CB3 0ET, United Kingdom
推荐引用方式 GB/T 7714	Christie F.D.W.,Bingham R.G.,Gourmelen N.,et al. Glacier change along West Antarctica's Marie Byrd Land Sector and links to inter-decadal atmosphere-ocean variability[J],2018,12(7).
APA	Christie F.D.W..,Bingham R.G..,Gourmelen N..,Steig E.J..,Bisset R.R..,...&Tett S.F.B..(2018).Glacier change along West Antarctica's Marie Byrd Land Sector and links to inter-decadal atmosphere-ocean variability.Cryosphere,12(7).
MLA	Christie F.D.W.,et al."Glacier change along West Antarctica's Marie Byrd Land Sector and links to inter-decadal atmosphere-ocean variability".Cryosphere 12.7(2018).