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On calculating the sea-level contribution in marine ice-sheet models

par Goelzer, Heiko ;Coulon, Violaine
Référence The INStabilities & Thresholds in ANTarctica (INSTANT 2023) (11-14 September 2023: Trieste, Italy)
Publication Non publié, 2023-09-13

Communication à un colloque

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Résumé :

Estimating the contribution of marine ice sheets to sea-level rise is complicated by ice grounded below sea level that is replaced by ocean water when melted. The common approach is to only consider the ice volume above floatation, defined as the volume of ice to be removed from an ice column to become afloat. With isostatic adjustment of the bedrock and external sea-level forcing that is not a result of mass changes of the ice sheet under consideration, this approach breaks down, because ice volume above floatation can be modified without actual changes in the sea-level contribution. We discuss a generalised approach for estimating the sea-level contribution from marine ice sheet models that conserves mass and consistently takes the effect of bedrock changes into account.