DOI: 10.1002/2013GL058933
论文题名: Persistent flow acceleration within the interior of the Greenland ice sheet
作者: Doyle S.H. ; Hubbard A. ; Fitzpatrick A.A.W. ; Van As D. ; Mikkelsen A.B. ; Pettersson R. ; Hubbard B.
刊名: Geophysical Research Letters
ISSN: 0094-10405
EISSN: 1944-10136
出版年: 2014
卷: 41, 期: 3 起始页码: 899
结束页码: 905
语种: 英语
英文关键词: Global Positioning System
; Greenland Ice Sheet
; Ice sheet dynamics
Scopus关键词: Ablation
; Dynamic response
; Glaciers
; Global positioning system
; Lakes
; Ablation area
; Equilibrium line altitudes
; Flow acceleration
; Greenland Ice Sheet
; Ice flow
; Ice motion
; Ice sheet dynamics
; Keypoints
; Ice
; ablation
; acceleration
; drainage
; dynamic response
; geoaccumulation
; measurement method
; melting
; velocity
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: We present surface velocity measurements from a high-elevation site located 140 km from the western margin of the Greenland ice sheet, and ~ 50 km into its accumulation area. Annual velocity increased each year from 51.78 ± 0.01 m yr-1 in 2009 to 52.92 ± 0.01 m yr-1 in 2012 - a net increase of 2.2%. These data also reveal a strong seasonal velocity cycle of up to 8.1% above the winter mean, driven by seasonal melt and supraglacial lake drainage. Sole et al. (2013) recently argued that ice motion in the ablation area is mediated by reduced winter flow following the development of efficient subglacial drainage during warmer, faster, summers. Our data extend this analysis and reveal a year-on-year increase in annual velocity above the equilibrium line altitude, where despite surface melt increasing, it is still sufficiently low to hinder the development of efficient drainage under thick ice. Key Points Ice flow in the accumulation area accelerated year-on-year between 2009 and 2012 The acceleration correlates with the inland expansion of supraglacial lakes This dynamic response contrasts with observations from the ablation zone ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893866282&doi=10.1002%2f2013GL058933&partnerID=40&md5=7e0be0f0687f8d65b2459410e9c16c25
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7669
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom
Recommended Citation:
Doyle S.H.,Hubbard A.,Fitzpatrick A.A.W.,et al. Persistent flow acceleration within the interior of the Greenland ice sheet[J]. Geophysical Research Letters,2014-01-01,41(3).