期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2016
卷号：35
页码：75-78
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Recent record-warm summers in Greenland (Khan et al.2015) have started affecting the higher regions of the ice sheet(i.e. the accumulation area), where increased melt has alteredthe properties of firn (i.e. multi-year snow). At high altitudes,meltwater percolates in the porous snow and firn, where it refreezes. The result is mass conservation, as the refrozen meltwater is essentially stored (Harper et al. 2012). However, insome regions increased meltwater refreezing in shallow firnhas created thick ice layers. These ice layers act as a lid, andcan inhibit meltwater percolation to greater depths, causingit to run off instead (Machguth et al. 2016). Meltwater atthe surface also results in more absorbed sunlight, and henceincreased melt in the accumulation area (Charalampidis etal. 2015). These relatively poorly understood processes areimportant for ice-sheet mass-budget projections.
