DOI: 10.1038/ngeo2675
论文题名: Impacts of warm water on Antarctic ice shelf stability through basal channel formation
作者: Alley K.E. ; Scambos T.A. ; Siegfried M.R. ; Fricker H.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 4 起始页码: 290
结束页码: 293
语种: 英语
Scopus关键词: altimetry
; ice flow
; ice shelf
; satellite imagery
; sea level change
; seawater
; timescale
; warm water
; water flow
; Antarctica
; West Antarctica
英文摘要: Antarctica's ice shelves provide resistance to the flow of grounded ice towards the ocean. If this resistance is decreased as a result of ice shelf thinning or disintegration, acceleration of grounded ice can occur, increasing rates of sea-level rise. Loss of ice shelf mass is accelerating, especially in West Antarctica, where warm seawater is reaching ocean cavities beneath ice shelves. Here we use satellite imagery, airborne ice-penetrating radar and satellite laser altimetry spanning the period from 2002 to 2014 to map extensive basal channels in the ice shelves surrounding Antarctica. The highest density of basal channels is found in West Antarctic ice shelves. Within the channels, warm water flows northwards, eroding the ice shelf base and driving channel evolution on annual to decadal timescales. Our observations show that basal channels are associated with the development of new zones of crevassing, suggesting that these channels may cause ice fracture. We conclude that basal channels can form and grow quickly as a result of warm ocean water intrusion, and that they can structurally weaken ice shelves, potentially leading to rapid ice shelf loss in some areas. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106031
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: National Snow and Ice Data Center, University of Colorado Boulder, Boulder, CO, United States; Scripps Institution of Oceanography, University of California San Diego, San Diego, CA, United States
Recommended Citation:
Alley K.E.,Scambos T.A.,Siegfried M.R.,et al. Impacts of warm water on Antarctic ice shelf stability through basal channel formation[J]. Nature Geoscience,2016-01-01,9(4)