Rapid disappearance of perennial ice on Canada's most northern lake
作者： Michel Paquette , Daniel Fortier , Derek R. Mueller , Denis Sarrazin , Warwick F. Vincent
DOI: 10.1002/2014GL062960
关键词:
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 thinning after least 50 years of relative stability. On all dates sampling from 1953 to 2007, 3.5 4.3 m covered 65–85% lake surface in summer. The thinned 2008 onward, became free 2011, an event followed by 26 days open water conditions 2012. This loss corresponded a significant increase melting degree days (MDD), mean (±SD) 80.4 (±36.5) MDD (1996–2007) 136.2 (±16.4) (2008–2012). shallow bathymetry combined with heat advection warm inflows caused feedback effects accelerated decay. These observations how changes across critical threshold can result disappearance thick ice.
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