Abstract
A nonsteady ice‐flow model that explicitly includes longitudinal stresses is used to study the effects of marginal changes on the interior portions of an ice sheet. Sea‐level rise is found to cause a wave of thinning to propagate upglacier, and this wave is slowed, diffused, and damped. At the ice divide at dome C in central East Antarctica, post‐Wisconsinan sea‐level rise is modeled as having caused 110 m thinning, with response now 70% complete. If accumulation rates increased by 10% at the same time, then calculated net thinning has been only 75 m. Ice‐sheet response to changes in sea level and accumulation rate is relatively rapid; response to temperature changes is an order of magnitude slower. Response times are shorter if the marginal position of an ice sheet is controlled.
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