气候变化领域集成服务门户(CCPortal): Episodic dynamic change linked to damage on the thwaites glacier ice tongue

CCPortal

DOI	10.1038/s41561-022-01097-9
	Episodic dynamic change linked to damage on the thwaites glacier ice tongue
	Surawy-Stepney, Trystan; Hogg, Anna E.; Cornford, Stephen L.; Davison, Benjamin J.
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	37
结束页码	+
卷号	16 期号:1 页码:11
英文摘要	The stability and dynamics of Thwaites Glacier depend on the structural properties of its marine terminus; however, the relationship between these variables on the floating ice tongue is poorly understood. Here we present a six-year record of ice speed, derived from satellite observations starting in 2015, showing two large-magnitude (approximately 30-45%) and prolonged (approximately one to two years) cycles of speed variation across the ice tongue. Using an automated, deep learning-based method of extracting high-resolution fracture maps from satellite imagery, we detail periods of increasing fracture development and subsequent reconsolidation in the ice tongue shear margin that coincide with the observed speed changes. Inverse modelling using the BISICLES ice-sheet model indicates that the variation in ice speed can be accounted for by these observed changes to the spatial pattern of fracturing. This study provides further evidence of direct coupling between fracturing and dynamic variability in West Antarctica but indicates that increased fracturing and associated speed changes are reversible on one- to two-year timescales. We suggest that fracturing does not necessarily lead to positive feedback with glacier acceleration on these timescales and that damage process modelling is important for accurately predicting the evolution of the Antarctic Ice Sheet.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000913823600003
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272435
作者单位	University of Leeds; University of Bristol
推荐引用方式 GB/T 7714	Surawy-Stepney, Trystan,Hogg, Anna E.,Cornford, Stephen L.,et al. Episodic dynamic change linked to damage on the thwaites glacier ice tongue[J],2023,16(1):11.
APA	Surawy-Stepney, Trystan,Hogg, Anna E.,Cornford, Stephen L.,&Davison, Benjamin J..(2023).Episodic dynamic change linked to damage on the thwaites glacier ice tongue.NATURE GEOSCIENCE,16(1),11.
MLA	Surawy-Stepney, Trystan,et al."Episodic dynamic change linked to damage on the thwaites glacier ice tongue".NATURE GEOSCIENCE 16.1(2023):11.