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标题：Observed melt-season snowpack evolution on the Greenland ice sheet
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作者：Charalampos Charalampidis ; Dirk van As
期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2015
卷号：33
页码：65-68
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Due to recent warm and record-warm summers in Greenland (Nghiem et al. 2012), the melt of the ice-sheet surfaceand the subsequent runoﬀ are increasing (Shepherd et al.2012). About 84% of the mass loss from the Greenland icesheet between 2009 and 2012 resulted from increased surface runoﬀ (Enderlin et al. 2014). Te largest melt occurs inthe ablation zone, the low marginal area of the ice sheet (VanAs et al. 2014), where melt exceeds wintertime accumulationand bare ice is thus exposed during each melt season. In thehigher regions of the ice sheet (i.e. the accumulation area),melt is limited and the snow cover persists throughout theyear. It is in the vast latter area that models struggle to calculate certain mass ﬂuxes with accuracy. A better understanding of processes such as meltwater percolation and refreezingin snow and f rn is crucial for more accurate Greenland icesheet mass-budget estimates (Van Angelen et al. 2013).