气候变化领域集成服务门户(CCPortal): Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet

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DOI	10.1029/2019GL086521
	Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet
	Pitcher L.H.; Smith L.C.; Gleason C.J.; Miège C.; Ryan J.C.; Hagedorn B.; van As D.; Chu W.; Forster R.R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:9
英文摘要	Meltwater runoff from the Greenland Ice Sheet (GrIS) significantly contributes to sea level rise and is the dominant driver of enhanced mass loss. While most melt occurs during summer, little is known about its seasonal and/or interannual retention within the GrIS. Here, we document evidence of runoff during winter, ~4 months after summer melt. Ground-penetrating radar and borehole surveys in the proglacial Isortoq River reveal slowly flowing water beneath >0.5 m of river ice. Geochemical analysis of this water indicates previous contact with the ice sheet bed. Comparable surveys in proglacial rivers draining four neighboring catchments found no winter drainage, despite a brief surface melt event ~10 days prior. We attribute the observed runoff to residual meltwater storage and release enabled by a >600 m deep trough beneath Isunguata Sermia, but not neighboring glaciers. We conclude that the GrIS bed can stay wet and drain small amounts of meltwater year-round. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Analytical geochemistry; Catchments; Geological surveys; Glaciers; Ground penetrating radar systems; Rivers; Runoff; Sea level; Direct observations; Flowing waters; Geochemical analysis; Greenland Ice Sheet; Ground Penetrating Radar; Interannual; Pro-glacial; Sea level rise; Ice; annual variation; ground penetrating radar; ice sheet; meltwater; runoff; sea ice; sea level change; trough; Arctic; Greenland; Greenland Ice Sheet; Isunguata Sermia
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/170391
作者单位	Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States; Department of Geography, University of California Los Angeles, Los Angeles, CA, United States; Institute at Brown for Environment and Society, Brown University, Providence, RI, United States; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States; Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, MA, United States; Department of Geography, Rutgers, The State University of New Jersey, Piscataway, NJ, United States; Department of Geography, University of Utah, Salt Lake City, UT, United States; Sustainable Earth Research LLC, Anchorage, AK, United States; Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark; Department of Geophysics, Stanford University, Stanford, CA, United States
推荐引用方式 GB/T 7714	Pitcher L.H.,Smith L.C.,Gleason C.J.,et al. Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet[J],2020,47(9).
APA	Pitcher L.H..,Smith L.C..,Gleason C.J..,Miège C..,Ryan J.C..,...&Forster R.R..(2020).Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet.Geophysical Research Letters,47(9).
MLA	Pitcher L.H.,et al."Direct Observation of Winter Meltwater Drainage From the Greenland Ice Sheet".Geophysical Research Letters 47.9(2020).