The ice dynamic and melting response of Pine Island Ice Shelf to calving

Bradley, Alexander T. ORCID:; De Rydt, Jan; Bett, David T. ORCID:; Dutrieux, Pierre ORCID:; Holland, Paul R. ORCID: 2022 The ice dynamic and melting response of Pine Island Ice Shelf to calving. Annals of Glaciology, 63 (87-89). 111-115.

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Sea level rise contributions from the Pine Island Glacier (PIG) are strongly modulated by the backstress that its floating extension – Pine Island Ice Shelf (PIIS) – exerts on the adjoining grounded ice. The front of PIIS has recently retreated significantly via calving, and satellite and theoretical analyses have suggested further retreat is inevitable. As well as inducing an instantaneous increase in ice flow, retreat of the PIIS front may result in increased ocean melting, by relaxing the topographic barrier to warm ocean water that is currently provided by a prominent seabed ridge. Recently published research (Bradley and others, 2022a) has shown that PIIS may exhibit a strong melting response to calving, with melting close to the PIG grounding line always increasing with ice front retreat. Here, we summarise this research and, additionally, place the results in a glaciological context by comparing the impact of melt-induced and ice-dynamical changes in the ice shelf thinning rate. We find that while PIG is expected to experience rapid acceleration in response to further ice front retreat, the mean instantaneous thinning response is set primarily by changes in melting, rather than ice dynamics. Overall, further ice front retreat is expected to lead to enhanced ice-shelf thinning, with potentially detrimental consequences for ice shelf stability.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 0260-3055
Additional Keywords: Ice/ocean interactions, Ice shelves, Ice-sheet modelling, Polar and subpolar oceans, Calving
Date made live: 03 May 2023 10:42 +0 (UTC)

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