期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 10, 页码 2109-2113出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50490
关键词
Greenland SMB; 21st century scenario; refreezing capacity
资金
- ice2sea programme from the European Union [226375]
Mass loss from the two major ice sheets and their contribution to global sea level rise is accelerating. In Antarctica, mass loss is dominated by increased flow velocities of outlet glaciers, following the thinning or disintegration of coastal ice shelves into which they flow. In contrast, similar to 55% of post-1992 Greenland ice sheet (GrIS) mass loss is accounted for by surface processes, notably increased meltwater runoff. A subtle process in the surface mass balance of the GrIS is the retention and refreezing of meltwater, currently preventing similar to 40% of the meltwater to reach the ocean. Here we force a high-resolution atmosphere/snow model with a mid-range warming scenario (RCP4.5, 1970-2100), to show that rapid loss of firn pore space, by >50% at the end of the 21st century, quickly reduces this refreezing buffer. As a result, GrIS surface mass loss accelerates throughout the 21st century and its contribution to global sea level rise increases to 1.7 0.5mmyr(-1), more than four times the current value.
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