气候变化领域集成服务门户(CCPortal): Ice shelf basal melt rates from a high-resolution digital elevation model (DEM) record for Pine Island Glacier, Antarctica

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DOI	10.5194/tc-13-2633-2019
	Ice shelf basal melt rates from a high-resolution digital elevation model (DEM) record for Pine Island Glacier, Antarctica
	Shean D.E.; Joughin I.R.; Dutrieux P.; Smith B.E.; Berthier E.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2633
结束页码	2656
卷号	13 期号:10
英文摘要	Ocean-induced basal melting is responsible for much of the Amundsen Sea Embayment ice loss in recent decades, but the total magnitude and spatiotemporal evolution of this melt is poorly constrained. To address this problem, we generated a record of high-resolution digital elevation models (DEMs) for Pine Island Glacier (PIG) using commercial sub-meter satellite stereo imagery and integrated additional 2002-2015 DEM and altimetry data. We implemented a Lagrangian elevation change (Dh=Dt ) framework to estimate ice shelf basal melt rates at 32-256m resolution. We describe this methodology and consider basal melt rates and elevation change over the PIG ice shelf and lower catchment from 2008 to 2015. We document the evolution of Eulerian elevation change (dh/dt ) and upstream propagation of thinning signals following the end of rapid grounding line retreat around 2010. Mean full-shelf basal melt rates for the 2008-2015 period were ~ 82-93 Gt yr-1, with ~ 200- 250myr-1 basal melt rates within large channels near the grounding line, ~ 10-30myr-1 over the main shelf, and ~ 0-10myr-1 over the North shelf and South shelf, with the notable exception of a small area with rates of ~ 50- 100myr-1 near the grounding line of a fast-flowing tributary on the South shelf. The observed basal melt rates show excellent agreement with, and provide context for, in situ basal melt-rate observations. We also document the relative melt rates for kilometer-scale basal channels and keels at different locations on the ice shelf and consider implications for ocean circulation and heat content. These methods and results offer new indirect observations of ice-ocean interaction and constraints on the processes driving sub-shelf melting beneath vulnerable ice shelves in West Antarctica. © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
学科领域	basal melting; catchment; digital elevation model; Euler flow; grounding line; ice shelf; ice-ocean interaction; image resolution; melting; satellite altimetry; tributary; Amundsen Sea; Antarctica; Pine Island Glacier; Southern Ocean; West Antarctica
语种	英语
scopus关键词	basal melting; catchment; digital elevation model; Euler flow; grounding line; ice shelf; ice-ocean interaction; image resolution; melting; satellite altimetry; tributary; Amundsen Sea; Antarctica; Pine Island Glacier; Southern Ocean; 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/118827
作者单位	Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98185, United States; Applied Physics Laboratory, University of Washington, Seattle, WA 98105, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; LEGOS, CNES, CNRS, IRD, UPS, Université de Toulouse, Toulouse, France
推荐引用方式 GB/T 7714	Shean D.E.,Joughin I.R.,Dutrieux P.,et al. Ice shelf basal melt rates from a high-resolution digital elevation model (DEM) record for Pine Island Glacier, Antarctica[J],2019,13(10).
APA	Shean D.E.,Joughin I.R.,Dutrieux P.,Smith B.E.,&Berthier E..(2019).Ice shelf basal melt rates from a high-resolution digital elevation model (DEM) record for Pine Island Glacier, Antarctica.The Cryosphere,13(10).
MLA	Shean D.E.,et al."Ice shelf basal melt rates from a high-resolution digital elevation model (DEM) record for Pine Island Glacier, Antarctica".The Cryosphere 13.10(2019).