Effect of sedimentation on ice-sheet grounding-line stability |
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| Authors: | Alley Richard B Anandakrishnan Sridhar Dupont Todd K Parizek Byron R Pollard David |
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| Institution: | Department of Geosciences and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802, USA. rba6@psu.edu |
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| Abstract: | Sedimentation filling space beneath ice shelves helps to stabilize ice sheets against grounding-line retreat in response to a rise in relative sea level of at least several meters. Recent Antarctic changes thus cannot be attributed to sea-level rise, strengthening earlier interpretations that warming has driven ice-sheet mass loss. Large sea-level rise, such as the approximately 100-meter rise at the end of the last ice age, may overwhelm the stabilizing feedback from sedimentation, but smaller sea-level changes are unlikely to have synchronized the behavior of ice sheets in the past. |
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