气候变化领域集成服务门户(CCPortal): Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland

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DOI	10.5194/tc-10-193-2016
	Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland
	Hughes T.; Sargent A.; Fastook J.; Purdon K.; Li J.; Yan J.-B.; Gogineni S.
发表日期	2016
ISSN	19940416
卷号	10 期号:1
英文摘要	The first-order control of ice thickness and height above sea level is linked to the decreasing strength of ice-bed coupling along flowlines from an interior ice divide to the calving front of an ice shelf. Uncoupling progresses as a frozen bed progressively thaws for sheet flow, as a thawed bed is progressively drowned for stream flow, and as lateral and/or local grounding vanish for shelf flow. This can reduce ice thicknesses by 90 % and ice elevations by 99 % along flowlines. Original work presented here includes (1) replacing flow and sliding laws for sheet flow with upper and lower yield stresses for creep in cold overlying ice and basal ice sliding over deforming till, respectively, (2) replacing integrating the Navier–Stokes equations for stream flow with geometrical solutions to the force balance, and (3) including resistance to shelf flow caused by lateral confinement in a fjord and local grounding at ice rumples and ice rises. A comparison is made between our approach and two approaches based on continuum mechanics. Applications are made to Byrd Glacier in Antarctica and Jakobshavn Isbrae in Greenland. © Author(s) 2016.
学科领域	basal ice; creep; frozen ground; height; ice sheet; ice shelf; ice stream; ice thickness; Navier-Stokes equations; sheet flow; shelf dynamics; streamflow; Antarctica; Arctic; Byrd Glacier; East Antarctica; Greenland; Jakobshavn Glacier
语种	英语
scopus关键词	basal ice; creep; frozen ground; height; ice sheet; ice shelf; ice stream; ice thickness; Navier-Stokes equations; sheet flow; shelf dynamics; streamflow; Antarctica; Arctic; Byrd Glacier; East Antarctica; Greenland; Jakobshavn Glacier
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/119715
作者单位	School of Earth and Climate Sciences, Climate Change Institute, University of Maine, Orono, ME, United States; School of Science and Humanities, Husson University, Bangor, ME, United States; Computer Sciences Department, Climate Change Institute University of Maine, Orono, ME, United States; Center for Remote Sensing of Ice Sheets, School of Engineering, University of Kansas, Lawrence, KS, United States
推荐引用方式 GB/T 7714	Hughes T.,Sargent A.,Fastook J.,et al. Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland[J],2016,10(1).
APA	Hughes T..,Sargent A..,Fastook J..,Purdon K..,Li J..,...&Gogineni S..(2016).Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland.Cryosphere,10(1).
MLA	Hughes T.,et al."Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland".Cryosphere 10.1(2016).