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We use a full-Stokes 2-D model (Elmer/Ice) to investigate the flow andcalving dynamics of Store Glacier, a fast-flowing outlet glacier in WestGreenland. Based on a new, subgrid-scale implementation of the crevasse depthcalving criterion, we perform two sets of simulations: one to identify theprimary forcing mechanisms and another to constrain future stability. We findthat the mixture of icebergs and sea ice, known as ice mélange orsikussak, is principally responsible for the observed seasonal advance of theice front. On the other hand, the effect of submarine melting on the calvingrate of Store Glacier appears to be limited. Sensitivity analysisdemonstrates that the glacier's calving dynamics are sensitive to seasonalperturbation, but are stable on interannual timescales due to the strongtopographic control on the flow regime. Our results shed light on thedynamics of calving glaciers and may help explain why neighbouring glaciersdo not necessarily respond synchronously to changes in atmospheric andoceanic forcing

the cryosphere

Are seasonal calving dynamics forced by buttressing from ice mélange or undercutting by melting? Outcomes from full-Stokes simulations of Store Glacier, West Greenland