气候变化领域集成服务门户(CCPortal): Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet

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DOI	10.5194/tc-7-129-2013
	Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet
	Doyle S.H.; Hubbard A.L.; Dow C.F.; Jones G.A.; Fitzpatrick A.; Gusmeroli A.; Kulessa B.; Lindback K.; Pettersson R.; Box J.E.
发表日期	2013
ISSN	19940416
卷号	7 期号:1
英文摘要	We present detailed records of lake discharge, ice motion and passive seismicity capturing the behaviour and processes preceding, during and following the rapid drainage of a 4 km2 supraglacial lake through 1.1-km-thick ice on the western margin of the Greenland Ice Sheet. Peak discharge of 3300 m3 s-1 coincident with maximal rates of vertical uplift indicates that surface water accessed the ice-bed interface causing widespread hydraulic separation and enhanced basal motion. The differential motion of four global positioning system (GPS) receivers located around the lake record the opening and closure of the fractures through which the lake drained. We hypothesise that the majority of discharge occurred through a 3-km-long fracture with a peak width averaged across its wetted length of 0.4 m. We argue that the fracture's kilometre-scale length allowed rapid discharge to be achieved by combining reasonable water velocities with sub-metre fracture widths. These observations add to the currently limited knowledge of in situ supraglacial lake drainage events, which rapidly deliver large volumes of water to the ice-bed interface. © Author(s) 2013.
学科领域	deformation; drainage network; glacial lake; GPS; ice movement; ice-structure interaction; peak discharge; seismicity; surface water; tectonic setting; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	deformation; drainage network; glacial lake; GPS; ice movement; ice-structure interaction; peak discharge; seismicity; surface water; tectonic setting; Arctic; Greenland; Greenland Ice Sheet
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/120315
作者单位	Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, United Kingdom; Glaciology Group, College of Science, Swansea University, Swansea, SA2 8PP, United Kingdom; Earth Sciences, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden; Department of Geography, Ohio State University, 1036 Derby Hall, Columbus, OH 43210-1361, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States
推荐引用方式 GB/T 7714	Doyle S.H.,Hubbard A.L.,Dow C.F.,et al. Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet[J],2013,7(1).
APA	Doyle S.H..,Hubbard A.L..,Dow C.F..,Jones G.A..,Fitzpatrick A..,...&Box J.E..(2013).Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet.Cryosphere,7(1).
MLA	Doyle S.H.,et al."Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet".Cryosphere 7.1(2013).