DOI: 10.1002/2016GL067758
论文题名: Episodic ice velocity fluctuations triggered by a subglacial flood in West Antarctica
作者: Siegfried M.R. ; Fricker H.A. ; Carter S.P. ; Tulaczyk S.
刊名: Geophysical Research Letters
ISSN: 0094-9247
EISSN: 1944-8978
出版年: 2016
卷: 43, 期: 6 起始页码: 2640
结束页码: 2648
语种: 英语
英文关键词: Antarctica
; glaciology
; ice dynamics
; ice sheet
; subglacial hydrology
; subglacial lakes
Scopus关键词: Aneroid altimeters
; Digital storage
; Glacial geology
; Glaciers
; Hydrology
; Lakes
; Slip forming
; Stick-slip
; Antarctica
; Glaciology
; Ice dynamics
; Ice sheet
; Subglacial hydrology
; Subglacial lakes
; Ice
; episodic event
; flood
; glacial hydrology
; glacial lake
; glacier dynamics
; glaciology
; GPS
; ice mechanics
; ice stream
; satellite altimetry
; subglacial environment
; trigger mechanism
; velocity structure
; Antarctica
; West Antarctica
英文摘要: Height change anomalies in satellite altimeter data have been interpreted as the surface expressions of basal water moving into and out of subglacial lakes. These signals have been mapped throughout Antarctica on timescales of months to years, but only broad connections have been made between active lakes and ice dynamics. We present the first high-frequency observations of ice velocity evolution due to a cascading subglacial lake drainage event, collected over 5 years (2010-2015) using Global Positioning System data on Whillans and Mercer ice streams, West Antarctica. We observed three episodic ice velocity changes over 2 years, where flow speed increased by up to 4%, as well as an 11 month disruption of the tidally modulated stick-slip cycle that dominates regional ice motion. Our observations reveal that basal conditions of an Antarctic ice stream can rapidly evolve and drive a dynamic ice response on subannual timescales, which can bias observations used to infer long-term ice sheet changes. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977934885&doi=10.1002%2f2016GL067758&partnerID=40&md5=704b8d3e9f798e19b04b00acb9b1ffb9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10210
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institute for Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States
Recommended Citation:
Siegfried M.R.,Fricker H.A.,Carter S.P.,et al. Episodic ice velocity fluctuations triggered by a subglacial flood in West Antarctica[J]. Geophysical Research Letters,2016-01-01,43(6).