气候变化领域集成服务门户(CCPortal): Environmental drivers of circum-Antarctic glacier and ice shelf front retreat over the last two decades

CCPortal

DOI	10.5194/tc-15-2357-2021
	Environmental drivers of circum-Antarctic glacier and ice shelf front retreat over the last two decades
	Baumhoer C.A.; Dietz A.J.; Kneisel C.; Paeth H.; Kuenzer C.
发表日期	2021
ISSN	19940416
起始页码	2357
结束页码	2381
卷号	15 期号:5
英文摘要	The safety band of Antarctica, consisting of floating glacier tongues and ice shelves, buttresses ice discharge of the Antarctic Ice Sheet. Recent disintegration events of ice shelves along with glacier retreat indicate a weakening of this important safety band. Predicting calving front retreat is a real challenge due to complex ice dynamics in a data-scarce environment that are unique for each ice shelf and glacier. We explore the extent to which easy-to-access remote sensing and modeling data can help to define environmental conditions leading to calving front retreat. For the first time, we present a circum-Antarctic record of glacier and ice shelf front change over the last two decades in combination with environmental variables such as air temperature, sea ice days, snowmelt, sea surface temperature, and wind direction. We find that the Antarctic Ice Sheet area decreased by-29 618 ± 1193 km2 in extent between 1997-2008 and gained an area of 7108 ± 1029 km2 between 2009 and 2018. Retreat concentrated along the Antarctic Peninsula and West Antarctica including the biggest ice shelves (Ross and Ronne). In several cases, glacier and ice shelf retreat occurred in conjunction with one or several changes in environmental variables. Decreasing sea ice days, intense snowmelt, weakening easterlies, and relative changes in sea surface temperature were identified as enabling factors for retreat. In contrast, relative increases in mean air temperature did not correlate with calving front retreat. For future studies a more appropriate measure for atmospheric forcing should be considered, including above-zero-degree days and temperature extreme events. To better understand drivers of glacier and ice shelf retreat, it is critical to analyze the magnitude of basal melt through the intrusion of warm Circumpolar Deep Water that is driven by strengthening westerlies and to further assess surface hydrology processes such as meltwater ponding, runoff, and lake drainage. © 2021 Celia A. Baumhoer et al.
英文关键词	atmospheric forcing; complexity; discharge; environmental factor; glacier retreat; ice sheet; ice shelf; iceberg calving; sea surface temperature; snowmelt; Antarctic Ice Sheet; 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/202273
作者单位	German Remote Sensing Data Center (DFD), German Aerospace Center (DLR), Weßling, 82234, Germany; Institute of Geography and Geology, University of Würzburg, Am Hubland, Würzburg, 97074, Germany
推荐引用方式 GB/T 7714	Baumhoer C.A.,Dietz A.J.,Kneisel C.,et al. Environmental drivers of circum-Antarctic glacier and ice shelf front retreat over the last two decades[J],2021,15(5).
APA	Baumhoer C.A.,Dietz A.J.,Kneisel C.,Paeth H.,&Kuenzer C..(2021).Environmental drivers of circum-Antarctic glacier and ice shelf front retreat over the last two decades.Cryosphere,15(5).
MLA	Baumhoer C.A.,et al."Environmental drivers of circum-Antarctic glacier and ice shelf front retreat over the last two decades".Cryosphere 15.5(2021).