DOI: 10.1038/ngeo2186
论文题名: Externally forced fluctuations in ocean temperature at Greenland glaciers in non-summer months
作者: Jackson R.H. ; Straneo F. ; Sutherland D.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 7 起始页码: 503
结束页码: 508
语种: 英语
Scopus关键词: climate forcing
; fjord
; freshwater input
; ice sheet
; melting
; underwater environment
; velocity profile
; water flow
; Arctic
; Greenland
; Helheim Glacier
; Kangerlussuaq Fjord
; Sermilik
英文摘要: Enhanced submarine melting of outlet glaciers has been identified as a plausible trigger for part of the accelerated mass loss from the Greenland ice sheet, which at present accounts for a quarter of global sea level rise. However, our understanding of what controls the submarine melt rate is limited and largely informed by brief summer surveys in the fjords where glaciers terminate. Here, we present continuous records of water properties and velocity from September to May in Sermilik Fjord (2011-2012) and Kangerdlugssuaq Fjord (2009-2010), the fjords into which the Helheim and Kangerdlugssuaq glaciers drain. We show that water properties, including heat content, vary significantly over timescales of three to ten days in both fjords. This variability results from frequent velocity pulses that originate on the shelf outside the fjord. The pulses drive rapid water exchange with the shelf and renew warm water in the fjord more effectively than any glacial freshwater-driven circulation. Our observations suggest that, during non-summer months, the glacier melt rate varies substantially and depends on externally forced ocean flows that rapidly transport changes on the shelf towards the glaciers'margins. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106533
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: Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Geological Sciences, University of Oregon, Eugene, OR 97403, United States
Recommended Citation:
Jackson R.H.,Straneo F.,Sutherland D.A.. Externally forced fluctuations in ocean temperature at Greenland glaciers in non-summer months[J]. Nature Geoscience,2014-01-01,7(7)