DOI: 10.5194/tc-7-1433-2013
Scopus记录号: 2-s2.0-84884604181
论文题名: Evidence of meltwater retention within the Greenland ice sheet
作者: Rennermalm A ; K ; , Smith L ; C ; , Chu V ; W ; , Box J ; E ; , Forster R ; R ; , Van Den Broeke M ; R ; , Van As D ; , Moustafa S ; E
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 5 起始页码: 1433
结束页码: 1445
语种: 英语
英文关键词: cryosphere
; firn
; GRIP
; hydrological regime
; meltwater
; proglacial environment
; retention
; river discharge
; runoff
; subglacial environment
; till
; water storage
; watershed
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Greenland ice sheet mass losses have increased in recent decades with more than half of these attributed to surface meltwater runoff. However, the magnitudes of englacial storage, firn retention, internal refreezing and other hydrologic processes that delay or reduce true water export to the global ocean remain less understood, partly due to a scarcity of in situ measurements. Here, ice sheet surface meltwater runoff and proglacial river discharge between 2008 and 2010 near Kangerlussuaq, southwestern Greenland were used to establish sub- and englacial meltwater storage for a small ice sheet watershed (36-64 km2). This watershed lacks significant potential meltwater storage in firn, surface lakes on the ice sheet and in the proglacial area, and receives limited proglacial precipitation. Thus, ice sheet surface runoff not accounted for by river discharge can reasonably be attributed to retention in sub- and englacial storage. Evidence for meltwater storage within the ice sheet includes (1) characteristic dampened daily river discharge amplitudes relative to ice sheet runoff; (2) three cold-season river discharge anomalies at times with limited ice sheet surface melt, demonstrating that meltwater may be retained up to 1-6 months; (3) annual ice sheet watershed runoff is not balanced by river discharge, and while near water budget closure is possible as much as 54% of melting season ice sheet runoff may not escape to downstream rivers; (4) even the large meltwater retention estimate (54%) is equivalent to less than 1% of the ice sheet volume, which suggests that storage in en- and subglacial cavities and till is plausible. While this study is the first to provide evidence for meltwater retention and delayed release within the Greenland ice sheet, more information is needed to establish how widespread this is along the Greenland ice sheet perimeter. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74948
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geography, Rutgers, State University of New Jersey, New Brunswick, NJ, United States; Department of Geography, University of California Los Angeles, Los Angeles, CA, United States; Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark; Department of Geography, University of Utah, Salt Lake City, UT, United States; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands
Recommended Citation:
Rennermalm A,K,, Smith L,et al. Evidence of meltwater retention within the Greenland ice sheet[J]. Cryosphere,2013-01-01,7(5)