气候变化领域集成服务门户(CCPortal): Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing

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DOI	10.1073/pnas.1205385109
	Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing
	Golledge N.R.; Fogwill C.J.; Mackintosh A.N.; Buckley K.M.
发表日期	2012
ISSN	0027-8424
起始页码	16052
结束页码	16056
卷号	109 期号:40
英文摘要	Retreat of the Last Glacial Maximum (LGM) Antarctic ice sheet is thought to have been initiated by changes in ocean heat and eustatic sea level propagated from the Northern Hemisphere (NH) as northern ice sheets melted under rising atmospheric temperatures. The extent to which spatial variability in ice dynamics may have modulated the resultant pattern and timing of decay of the Antarctic ice sheet has so far received little attention, however, despite the growing recognition that dynamic effects account for a sizeable proportion of mass-balance changes observed in modern ice sheets. Here we use a 5-km resolution whole-continent numerical ice-sheet model to assess whether differences in the mechanisms governing ice sheet flow could account for discrepancies between geochronological studies in different parts of the continent. We first simulate the geometry and flow characteristics of an equilibrium LGM ice sheet, using pan-Antarctic terrestrial and marine geological data for constraint, then perturb the system with sea level and ocean heat flux increases to investigate ice-sheet vulnerability. Our results identify that fast-flowing glaciers in the eastern Weddell Sea, the Amundsen Sea, central Ross Sea, and in the Amery Trough respond most rapidly to ocean forcings, in agreement with empirical data. Most significantly,we find that although ocean warming and sea-level rise bring about mainly localized glacier acceleration, concomitant drawdown of ice from neighboring areas leads to widespread thinning of entire glacier catchments - a discovery that has important ramifications for the dynamic changes presently being observed in modern ice sheets.
英文关键词	Deglaciation; Enhanced flow; Ice-sheet modeling; Longitudinal coupling
语种	英语
scopus关键词	air temperature; Antarctica; article; geology; geometry; heat; ice sheet; last glacial maximum; Northern Hemisphere; priority journal; sea level rise; sediment; warming; Antarctic Regions; Computer Simulation; Global Warming; History, Ancient; Ice Cover; Models, Theoretical; Oceans and Seas; Water Movements
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159130
作者单位	Golledge, N.R., Antarctic Research Centre, Victoria University of Wellington, Wellington 6140, New Zealand; Fogwill, C.J., Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia; Mackintosh, A.N., Antarctic Research Centre, Victoria University of Wellington, Wellington 6140, New Zealand; Buckley, K.M., School of Engineering and Computing Science, Victoria University of Wellington, Wellington 6140, New Zealand
推荐引用方式 GB/T 7714	Golledge N.R.,Fogwill C.J.,Mackintosh A.N.,et al. Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing[J],2012,109(40).
APA	Golledge N.R.,Fogwill C.J.,Mackintosh A.N.,&Buckley K.M..(2012).Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing.Proceedings of the National Academy of Sciences of the United States of America,109(40).
MLA	Golledge N.R.,et al."Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing".Proceedings of the National Academy of Sciences of the United States of America 109.40(2012).