DOI: 10.1002/jgrd.50222
论文题名: Antarctic ice sheet mass loss estimates using Modified Antarctic Mapping Mission surface flow observations
作者: Ren D. ; Leslie L.M. ; Lynch M.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 5 起始页码: 2119
结束页码: 2135
语种: 英语
英文关键词: Antarctica ice sheet
; climate change
; granular basal sliding
; ice modeling
; tabular calving scheme
; tributary ice flow
Scopus关键词: Climate change
; Computer simulation
; Dynamic response
; Feedback
; Geodetic satellites
; Glacial geology
; Glaciers
; Parameter estimation
; Antarctic ice sheets
; Basal sliding
; Coupled general circulation models
; Cross sectional area
; Feedback mechanisms
; Ice flow
; Ice sheet
; tabular calving scheme
; Ice
; feedback mechanism
; flow field
; general circulation model
; glacier mass balance
; ice flow
; ice sheet
; ice shelf
; ice stream
; mapping
; residence time
; sliding
; surface flux
; twenty first century
; warming
; Antarctica
英文摘要: The long residence time of ice and the relatively gentle slopes of the Antarctica Ice Sheet make basal sliding a unique positive feedback mechanism in enhancing ice discharge along preferred routes. The highly organized ice stream channels extending to the interior from the lower reach of the outlets are a manifestation of the role of basal granular material in enhancing the ice flow. In this study, constraining the model-simulated year 2000 ice flow fields with surface velocities obtained from InSAR measurements permits retrieval of the basal sliding parameters. Forward integrations of the ice model driven by atmospheric and oceanic parameters from coupled general circulation models under different emission scenarios provide a range of estimates of total ice mass loss during the 21st century. The total mass loss rate has a small intermodel and interscenario spread, rising from approximately -160 km3/yr at present to approximately -220 km3/yr by 2100. The accelerated mass loss rate of the Antarctica Ice Sheet in a warming climate is due primarily to a dynamic response in the form of an increase in ice flow speed. Ice shelves contribute to this feedback through a reduced buttressing effect due to more frequent systematic, tabular calving events. For example, by 2100 the Ross Ice Shelf is projected to shed ~40 km3 during each systematic tabular calving. After the frontal section's attrition, the remaining shelf will rebound. Consequently, the submerged cross-sectional area will reduce, as will the buttressing stress. Longitudinal differential warming of ocean temperature contributes to tabular calving. Because of the prevalence of fringe ice shelves, oceanic effects likely will play a very important role in the future mass balance of the Antarctica Ice Sheet, under a possible future warming climate. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63876
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Applied Physics, Curtin University of Technology, Perth WA, Australia; School of Meteorology, University of Oklahoma, Norman OK, United States; Australian Sustainable Development Institute, Curtin University, Perth WA, Australia
Recommended Citation:
Ren D.,Leslie L.M.,Lynch M.J.. Antarctic ice sheet mass loss estimates using Modified Antarctic Mapping Mission surface flow observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(5)