气候变化领域集成服务门户(CCPortal): The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula

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DOI	10.5194/tc-15-909-2021
	The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula
	Banwell A.F.; Tri Datta R.; Dell R.L.; Moussavi M.; Brucker L.; Picard G.; Shuman C.A.; Stevens L.A.
发表日期	2021
ISSN	19940416
起始页码	909
结束页码	925
卷号	15 期号:2
英文摘要	pIn the 2019/2020 austral summer, the surface melt duration and extent on the northern George VI Ice Shelf (GVIIS) was exceptional compared to the 31 previous summers of distinctly lower melt. This finding is based on analysis of near-continuous 41-year satellite microwave radiometer and scatterometer data, which are sensitive to meltwater on the ice shelf surface and in the near-surface snow. Using optical satellite imagery from Landsat 8 (2013 to 2020) and Sentinel-2 (2017 to 2020), record volumes of surface meltwater ponding were also observed on the northern GVIIS in 2019/2020, with 23 % of the surface area covered by 0.62 kmspan classCombining double low line"inline-formula"3/span of ponded meltwater on 19 January. These exceptional melt and surface ponding conditions in 2019/2020 were driven by sustained air temperatures span classCombining double low line"inline-formula"0/span span classCombining double low line"inline-formula"g /spanC for anomalously long periods (55 to 90 h) from late November onwards, which limited meltwater refreezing. The sustained warm periods were likely driven by warm, low-speed (span classCombining double low line"inline-formula"≤7.5/span m sspan classCombining double low line"inline-formula"-1/span) northwesterly and northeasterly winds and not by foehn wind conditions, which were only present for 9 h total in the 2019/2020 melt season. Increased surface ponding on ice shelves may threaten their stability through increased potential for hydrofracture initiation; a risk that may increase due to firn air content depletion in response to near-surface melting./p. © 2021 Mary Ann Liebert Inc.. All rights reserved.
英文关键词	air temperature; ice shelf; meltwater; microwave radiometer; satellite imagery; seasonal variation; spatiotemporal analysis; Antarctica; George VI Ice Shelf; West Antarctica
语种	英语
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/202270
作者单位	Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States; Scott Polar Research Institute (SPRI), University of Cambridge, Cambridge, United Kingdom; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Atmospheric and Oceanic Sciences (ATOC), University of Colorado Boulder, Boulder, CO, United States; National Snow and Ice Data Center (NSIDC), University of Colorado Boulder, Boulder, CO, United States; Goddard Earth Sciences Technology and Research Studies and Investigations, Universities Space Research Association, Columbia, MD, United States; Institut des Géosciences de l'Environnement (IGE), CNRS, Univ. Grenoble Alpes, UMR 5001, Grenoble, 38041, France; Joint Center for Earth Systems Technology, University of Maryland, Baltimore County, Greenbelt, MD, United States; Depart...
推荐引用方式 GB/T 7714	Banwell A.F.,Tri Datta R.,Dell R.L.,et al. The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula[J],2021,15(2).
APA	Banwell A.F..,Tri Datta R..,Dell R.L..,Moussavi M..,Brucker L..,...&Stevens L.A..(2021).The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula.Cryosphere,15(2).
MLA	Banwell A.F.,et al."The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula".Cryosphere 15.2(2021).