DOI: 10.1002/2014GL062960
论文题名: Rapid disappearance of perennial ice on Canada's most northern lake
作者: Paquette M. ; Fortier D. ; Mueller D.R. ; Sarrazin D. ; Vincent W.F.
刊名: Geophysical Research Letters
ISSN: 0094-8904
EISSN: 1944-8635
出版年: 2015
卷: 42, 期: 5 起始页码: 1433
结束页码: 1440
语种: 英语
英文关键词: High arctic
; Ice cover
; lake ice
; Nunavut
; Perennial ice
; Polar lake
Scopus关键词: Lakes
; Satellite imagery
; Aerial Photographs
; Critical threshold
; Feedback effects
; Heat advection
; High arctic
; Ice cover
; Nunavut
; Relative stabilities
; Ice
; advection
; aerial photograph
; bathymetric survey
; fieldwork
; ice cover
; open water
; satellite imagery
; Canada
英文摘要: Field records, aerial photographs, and satellite imagery show that the perennial ice cover on Ward Hunt Lake at Canada's northern coast experienced rapid contraction and thinning after at least 50 years of relative stability. On all dates of sampling from 1953 to 2007, 3.5 to 4.3 m of perennial ice covered 65-85% of the lake surface in summer. The ice cover thinned from 2008 onward, and the lake became ice free in 2011, an event followed by 26 days of open water conditions in 2012. This rapid ice loss corresponded to a significant increase in melting degree days (MDD), from a mean (±SD) of 80.4 (±36.5) MDD (1996-2007) to 136.2 (±16.4) MDD (2008-2012). The shallow bathymetry combined with heat advection by warm inflows caused feedback effects that accelerated the ice decay. These observations show how changes across a critical threshold can result in the rapid disappearance of thick perennial ice. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925881687&doi=10.1002%2f2014GL062960&partnerID=40&md5=8d3b6b556ea7cc260e8a2871d66b92f6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8520
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: Centre for Northern Studies, Département de Géographie, Université de Montréal, Montréal, QC, Canada
Recommended Citation:
Paquette M.,Fortier D.,Mueller D.R.,et al. Rapid disappearance of perennial ice on Canada's most northern lake[J]. Geophysical Research Letters,2015-01-01,42(5).