globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2482
论文题名:
Amplified melt and flow of the Greenland ice sheet driven by late-summer cyclonic rainfall
作者: Doyle S.H.; Hubbard A.; Van De Wal R.S.W.; Box J.E.; Van As D.; Scharrer K.; Meierbachtol T.W.; Smeets P.C.J.P.; Harper J.T.; Johansson E.; Mottram R.H.; Mikkelsen A.B.; Wilhelms F.; Patton H.; Christoffersen P.; Hubbard B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:8
起始页码: 647
结束页码: 653
语种: 英语
Scopus关键词: acceleration ; air mass ; climate change ; cyclone ; data set ; ice flow ; measurement method ; melting ; rainfall ; runoff ; summer ; valley glacier ; velocity ; Alaska ; Arctic ; Greenland ; Greenland Ice Sheet ; United States
英文摘要: Intense rainfall events significantly affect Alpine and Alaskan glaciers through enhanced melting, ice-flow acceleration and subglacial sediment erosion, yet their impact on the Greenland ice sheet has not been assessed. Here we present measurements of ice velocity, subglacial water pressure and meteorological variables from the western margin of the Greenland ice sheet during a week of warm, wet cyclonic weather in late August and early September 2011. We find that extreme surface runoff from melt and rainfall led to a widespread acceleration in ice flow that extended 140 km into the ice-sheet interior. We suggest that the late-season timing was critical in promoting rapid runoff across an extensive bare ice surface that overwhelmed a subglacial hydrological system in transition to a less-efficient winter mode. Reanalysis data reveal that similar cyclonic weather conditions prevailed across southern and western Greenland during this time, and we observe a corresponding ice-flow response at all land- and marine-terminating glaciers in these regions for which data are available. Given that the advection of warm, moist air masses and rainfall over Greenland is expected to become more frequent in the coming decades, our findings portend a previously unforeseen vulnerability of the Greenland ice sheet to climate change. © 2015 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106218
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology, Arctic University of Norway, TromsØ, Norway; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, PO Box 80005, Utrecht, Netherlands; Geological Survey of Denmark and Greenland, øster Voldgade 10, Copenhagen K, Denmark; Department of Geography, Ohio State University, 154 North Oval Mall, Columbus, OH, United States; ENVEO IT GmbH, Innsbruck, Austria; Department of Geosciences, University of Montana, Missoula, Montana, United States; Department of Physical Geography and Quaternary Geology, Bert Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Swedish Nuclear Fuel andWaste Management Co, Stockholm, Sweden; Danish Meteorological Institute, Lyngbyvej 100, Copenhagen Ø, Denmark; Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, Germany; Department of Crystallography, Geoscience Centre, University of Göttingen, Goldschmidtstraße 1, Göttingen, Germany; Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge, United Kingdom

Recommended Citation:
Doyle S.H.,Hubbard A.,Van De Wal R.S.W.,et al. Amplified melt and flow of the Greenland ice sheet driven by late-summer cyclonic rainfall[J]. Nature Geoscience,2015-01-01,8(8)
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