Stabilizing effect of mélange buttressing on the marine ice-cliff instability of the West Antarctic Ice Sheet ...

Owing to global warming and particularly high regional ocean warming, both Thwaites and Pine Island Glaciers in the Amundsen region of the Antarctic Ice Sheet could lose their buttressing ice shelves over time. We analyse the possible consequences using the parallel ice sheet model (PISM), applying...

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Bibliographic Details
Main Authors: Schlemm, Tanja, Feldmann, Johannes, Winkelmann, Ricarda, Levermann, Anders
Format: Text
Language:unknown
Published: Katlenburg-Lindau : Copernicus 2022
Subjects:
Antarctica
Pine Island Glacier
Thwaites Glacier
West Antarctica
global warming
910
Antarctic
The Antarctic
West Antarctic Ice Sheet
Misi
Antarc*
Ice Sheet
Ice Shelf
Ice Shelves
Pine Island
Online Access:https://dx.doi.org/10.34657/10898
https://oa.tib.eu/renate/handle/123456789/11865
Description
Summary:Owing to global warming and particularly high regional ocean warming, both Thwaites and Pine Island Glaciers in the Amundsen region of the Antarctic Ice Sheet could lose their buttressing ice shelves over time. We analyse the possible consequences using the parallel ice sheet model (PISM), applying a simple cliff-calving parameterization and an ice mélange-buttressing model. We find that the instantaneous loss of ice-shelf buttressing, due to enforced ice-shelf melting, initiates grounding-line retreat and triggers marine ice sheet instability (MISI). As a consequence, the grounding line progresses into the interior of the West Antarctic Ice Sheet and leads to a sea level contribution of 0.6m within 100a. By subjecting the exposed ice cliffs to cliff calving using our simplified parameterization, we also analyse marine ice cliff instability (MICI). In our simulations it can double or even triple the sea level contribution depending on the only loosely constrained parameter that determines the maximum ...

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