气候变化领域集成服务门户(CCPortal): Scaling of instability timescales of Antarctic outlet glaciers based on one-dimensional similitude analysis

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DOI	10.5194/tc-13-1621-2019
	Scaling of instability timescales of Antarctic outlet glaciers based on one-dimensional similitude analysis
	Levermann A.; Feldmann J.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1621
结束页码	1633
卷号	13 期号:6
英文摘要	Recent observations and ice-dynamic modeling suggest that a marine ice-sheet instability (MISI) might have been triggered in West Antarctica. The corresponding outlet glaciers, Pine Island Glacier (PIG) and Thwaites Glacier (TG), showed significant retreat during at least the last 2 decades. While other regions in Antarctica have the topographic predisposition for the same kind of instability, it is so far unclear how fast these instabilities would unfold if they were initiated. Here we employ the concept of similitude to estimate the characteristic timescales of several potentially MISI-prone outlet glaciers around the Antarctic coast. Our results suggest that TG and PIG have the fastest response time of all investigated outlets, with TG responding about 1.25 to 2 times as fast as PIG, while other outlets around Antarctica would be up to 10 times slower if destabilized. These results have to be viewed in light of the strong assumptions made in their derivation. These include the absence of ice-shelf buttressing, the one-dimensionality of the approach and the uncertainty of the available data. We argue however that the current topographic situation and the physical conditions of the MISI-prone outlet glaciers carry the information of their respective timescale and that this information can be partially extracted through a similitude analysis.. © Author(s) 2019.
学科领域	glacier dynamics; hydrological modeling; ice sheet; ice shelf; instability; one-dimensional modeling; scale effect; timescale; uncertainty analysis; Antarctica; Pine Island Glacier; Thwaites Glacier; West Antarctica
语种	英语
scopus关键词	glacier dynamics; hydrological modeling; ice sheet; ice shelf; instability; one-dimensional modeling; scale effect; timescale; uncertainty analysis; Antarctica; Pine Island Glacier; Thwaites Glacier; West Antarctica
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118875
作者单位	Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany; LDEO, Columbia University, New York, NY, United States; Institute of Physics, University of Potsdam, Potsdam, Germany
推荐引用方式 GB/T 7714	Levermann A.,Feldmann J.. Scaling of instability timescales of Antarctic outlet glaciers based on one-dimensional similitude analysis[J],2019,13(6).
APA	Levermann A.,&Feldmann J..(2019).Scaling of instability timescales of Antarctic outlet glaciers based on one-dimensional similitude analysis.The Cryosphere,13(6).
MLA	Levermann A.,et al."Scaling of instability timescales of Antarctic outlet glaciers based on one-dimensional similitude analysis".The Cryosphere 13.6(2019).