Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project I: Antarctica
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Atmospheric, oceanic, and subglacial forcing scenarios from the Sea-level Response to Ice Sheet Evolution (SeaRISE) project are applied to six three-dimensional thermomechanical ice-sheet models to assess Antarctic ice sheet sensitivity over a 500?year timescale and to inform future modeling and field studies. Results indicate (i) growth with warming, except within low-latitude basins (where inland thickening is outpaced by marginal thinning); (ii) mass loss with enhanced sliding (with basins dominated by high driving stresses affected more than basins with low-surface-slope streaming ice); and (iii) mass loss with enhanced ice shelf melting (with changes in West Antarctica dominating the signal due to its marine setting and extensive ice shelves; cf. minimal impact in the Terre Adelie, George V, Oates, and Victoria Land region of East Antarctica). Ice loss due to dynamic changes associated with enhanced sliding and/or sub-shelf melting exceeds the gain due to increased precipitation. Furthermore, differences in results between and within basins as well as the controlling impact of sub-shelf melting on ice dynamics highlight the need for improved understanding of basal conditions, grounding-zone processes, ocean-ice interactions, and the numerical representation of all three.
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Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project I: AntarcticaNowicki, S.; Bindschadler, R.; Abe-Ouchi, A.; Aschwanden, A.; Bueler, E.; Choi, H.; Fastook, J.; Granzow, G.; Greve, R.; Gutowski, G.; Herzfeld, U.; Jackson, C.; Johnson, J.; Khroulev, C.; Larour, E.; Levermann, A.; Lipscomb, W.; Martin, M.; Morlighem, M.; Parizek, B.; Pollard, D.; Price, S.; Ren, Diandong; Rignot, E.; Saito, F.; Sato, T.; Seddik, H.; Seroussi, H.; Takahashi, K.; Walker, R.; Wang, W. (2013)Atmospheric, oceanic, and subglacial forcing scenarios from the Sea-level Response to Ice Sheet Evolution (SeaRISE) project are applied to six three-dimensional thermomechanical ice-sheet models to assess Antarctic ice ...
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Ice-sheet model sensitivities to environmental forcing and their use in projecting future sea level (the SeaRISE project)Bindschadler, R.; Nowicki, S.; Abe-Ouchi, A.; Aschwanden, A.; Choi, H.; Fastook, J.; Ren, Diandong (2013)Ten ice-sheet models are used to study sensitivity of the Greenland and Antarctic ice sheets to prescribed changes of surface mass balance, sub-ice-shelf melting and basal sliding. Results exhibit a large range in projected ...