气候变化领域集成服务门户(CCPortal): Observations of Buried Lake Drainage on the Antarctic Ice Sheet

CCPortal

DOI	10.1029/2020GL087970
	Observations of Buried Lake Drainage on the Antarctic Ice Sheet
	Dunmire D.; Lenaerts J.T.M.; Banwell A.F.; Wever N.; Shragge J.; Lhermitte S.; Drews R.; Pattyn F.; Hansen J.S.S.; Willis I.C.; Miller J.; Keenan E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Between 1992 and 2017, the Antarctic Ice Sheet (AIS) lost ice equivalent to 7.6 ± 3.9 mm of sea level rise. AIS mass loss is mitigated by ice shelves that provide a buttress by regulating ice flow from tributary glaciers. However, ice-shelf stability is threatened by meltwater ponding, which may initiate, or reactivate preexisting, fractures, currently poorly understood processes. Here, through ground penetrating radar (GPR) analysis over a buried lake in the grounding zone of an East Antarctic ice shelf, we present the first field observations of a lake drainage event in Antarctica via vertical fractures. Concurrent with the lake drainage event, we observe a decrease in surface elevation and an increase in Sentinel-1 backscatter. Finally, we suggest that fractures that are initiated or reactivated by lake drainage events in a grounding zone will propagate with ice flow onto the ice shelf itself, where they may have implications for its stability. ©2020. The Authors.
英文关键词	Automatic identification; Fracture; Geological surveys; Geophysical prospecting; Glaciers; Ground penetrating radar systems; Lakes; Sea level; Antarctic ice sheets; Antarctic ice shelves; Field observations; Ground penetrating radar (GPR); Lake drainage events; Sea level rise; Surface elevations; Vertical fracture; Ice; ground penetrating radar; grounding line; ice flow; ice shelf; observational method; sea level change; Sentinel; Antarctic Ice Sheet; Antarctica
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169973
作者单位	Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences (CIRES), Boulder, CO, United States; Scott Polar Research Institute (SPRI), University of Cambridge, Cambridge, United Kingdom; Geophysics Department, Colorado School of Mines, Golden, CO, United States; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands; Department of Geology and Geodynamics, Universität Tübingen, Tübingen, Germany; Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium; Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Dunmire D.,Lenaerts J.T.M.,Banwell A.F.,et al. Observations of Buried Lake Drainage on the Antarctic Ice Sheet[J],2020,47(15).
APA	Dunmire D..,Lenaerts J.T.M..,Banwell A.F..,Wever N..,Shragge J..,...&Keenan E..(2020).Observations of Buried Lake Drainage on the Antarctic Ice Sheet.Geophysical Research Letters,47(15).
MLA	Dunmire D.,et al."Observations of Buried Lake Drainage on the Antarctic Ice Sheet".Geophysical Research Letters 47.15(2020).