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Modeling of Store Gletscher's calving dynamics, West Greenland, in response to ocean thermal forcing
Author(s) -
Morlighem M.,
Bondzio J.,
Seroussi H.,
Rignot E.,
Larour E.,
Humbert A.,
Rebuffi S.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl067695
Subject(s) - geology , glacier , sill , glacier ice accumulation , ice calving , tidewater glacier cycle , oceanography , glacier terminus , surge , front (military) , fjord , glacier mass balance , climatology , geomorphology , ice stream , sea ice , cryosphere , pregnancy , geochemistry , lactation , biology , genetics
Abstract 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 27 km into a reverse bed. The model suggests that ice‐ocean interactions are the triggering mechanism of glacier retreat, but the bed controls its magnitude.