DOI: 10.1002/2016GL070414
论文题名: Greenland Ice Sheet flow response to runoff variability
作者: Stevens L.A. ; Behn M.D. ; Das S.B. ; Joughin I. ; Noël B.P.Y. ; van den Broeke M.R. ; Herring T.
刊名: Geophysical Research Letters
ISSN: 0094-8439
EISSN: 1944-8170
出版年: 2016
卷: 43, 期: 21 起始页码: 11295
结束页码: 11303
语种: 英语
英文关键词: Greenland Ice Sheet
; ice flow
; runoff
Scopus关键词: Glaciers
; Lakes
; Runoff
; Velocity
; Dynamical response
; Global positioning system networks
; Greenland Ice Sheet
; Ice flow
; Ice sheet models
; Interannual variability
; Negative correlation
; Relevant feedback
; Ice
英文摘要: We use observations of ice sheet surface motion from a Global Positioning System network operating from 2006 to 2014 around North Lake in west Greenland to investigate the dynamical response of the Greenland Ice Sheet's ablation area to interannual variability in surface melting. We find no statistically significant relationship between runoff season characteristics and ice flow velocities within a given year or season. Over the 7 year time series, annual velocities at North Lake decrease at an average rate of −0.9 ± 1.1 m yr−2, consistent with the negative trend in annual velocities observed in neighboring regions over recent decades. We find that net runoff integrated over several preceding years has a negative correlation with annual velocities, similar to findings from the two other available decadal records of ice velocity in western Greenland. However, we argue that this correlation is not necessarily evidence for a direct hydrologic mechanism acting on the timescale of multiple years but could be a statistical construct. Finally, we stress that neither the decadal slowdown trend nor the negative correlation between velocity and integrated runoff is predicted by current ice-sheet models, underscoring that these models do not yet capture all the relevant feedbacks between runoff and ice dynamics needed to predict long-term trends in ice sheet flow. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84998996023&doi=10.1002%2f2016GL070414&partnerID=40&md5=d44a4d8809dac9d35ad498f97eee7e6f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9402
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: Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography/Applied Ocean Science and Engineering, Woods Hole, MA, United States
Recommended Citation:
Stevens L.A.,Behn M.D.,Das S.B.,et al. Greenland Ice Sheet flow response to runoff variability[J]. Geophysical Research Letters,2016-01-01,43(21).