气候变化领域集成服务门户(CCPortal): Antarctic ice shelf thickness change from multimission lidar mapping

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DOI	10.5194/tc-13-1801-2019
	Antarctic ice shelf thickness change from multimission lidar mapping
	Sutterley T.C.; Markus T.; Neumann T.A.; Van Den Broeke M.; Van Wessem J.M.; Ligtenberg S.R.M.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1801
结束页码	1817
卷号	13 期号:7
英文摘要	We calculate rates of ice thickness change and bottom melt for ice shelves in West Antarctica and the Antarctic Peninsula from a combination of elevation measurements from NASA-CECS Antarctic ice mapping campaigns and NASA Operation IceBridge corrected for oceanic processes from measurements and models, surface velocity measurements from synthetic aperture radar, and high-resolution outputs from regional climate models. The ice thickness change rates are calculated in a Lagrangian reference frame to reduce the effects from advection of sharp vertical features, such as cracks and crevasses, that can saturate Eulerian-derived estimates. We use our method over different ice shelves in Antarctica, which vary in terms of size, repeat coverage from airborne altimetry, and dominant processes governing their recent changes. We find that the Larsen-C Ice Shelf is close to steady state over our observation period with spatial variations in ice thickness largely due to the flux divergence of the shelf. Firn and surface processes are responsible for some short-term variability in ice thickness of the Larsen-C Ice Shelf over the time period. The Wilkins Ice Shelf is sensitive to short-timescale coastal and upper-ocean processes, and basal melt is the dominant contributor to the ice thickness change over the period. At the Pine Island Ice Shelf in the critical region near the grounding zone, we find that ice shelf thickness change rates exceed 40 m yr-1, with the change dominated by strong submarine melting. Regions near the grounding zones of the Dotson and Crosson ice shelves are decreasing in thickness at rates greater than 40 m yr-1, also due to intense basal melt. NASA-CECS Antarctic ice mapping and NASA Operation IceBridge campaigns provide validation datasets for floating ice shelves at moderately high resolution when coregistered using Lagrangian methods. © 2019 Author(s).
学科领域	climate modeling; floating ice; grounding line; ice shelf; ice thickness; lidar; mapping method; measurement method; regional climate; satellite altimetry; Antarctic Peninsula; Antarctica; Antarctica; Florida [United States]; Larsen Ice Shelf; Pine Island; United States; West Antarctica; Wilkins Ice Shelf
语种	英语
scopus关键词	climate modeling; floating ice; grounding line; ice shelf; ice thickness; lidar; mapping method; measurement method; regional climate; satellite altimetry; Antarctic Peninsula; Antarctica; Antarctica; Florida [United States]; Larsen Ice Shelf; Pine Island; United States; West Antarctica; Wilkins Ice Shelf
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/118867
作者单位	NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Sutterley T.C.,Markus T.,Neumann T.A.,et al. Antarctic ice shelf thickness change from multimission lidar mapping[J],2019,13(7).
APA	Sutterley T.C.,Markus T.,Neumann T.A.,Van Den Broeke M.,Van Wessem J.M.,&Ligtenberg S.R.M..(2019).Antarctic ice shelf thickness change from multimission lidar mapping.The Cryosphere,13(7).
MLA	Sutterley T.C.,et al."Antarctic ice shelf thickness change from multimission lidar mapping".The Cryosphere 13.7(2019).