期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 6, 页码 2659-2666出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL067695
关键词
glaciology; calving; ice-ocean interactions; Store Gletscher; inverse modeling
资金
- National Aeronautics and Space Administration, Cryospheric Sciences Program [NNX15AD55G]
Glacier-front dynamics is an important control on Greenland's ice mass balance. Warmer ocean waters trigger ice-front retreats of marine-terminating glaciers, and the corresponding loss in resistive stress leads to glacier acceleration and thinning. Here we present an approach to quantify the sensitivity and vulnerability of marine-terminating glaciers to ocean-induced melt. We develop a plan view model of Store Gletscher that includes a level set-based moving boundary capability, a parameterized ocean-induced melt, and a calving law with complete and precise land and fjord topographies to model the response of the glacier to increased melt. We find that the glacier is stabilized by a sill at its terminus. The glacier is dislodged from the sill when ocean-induced melt quadruples, at which point the glacier retreats irreversibly for 27km into a reverse bed. The model suggests that ice-ocean interactions are the triggering mechanism of glacier retreat, but the bed controls its magnitude.
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