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

Schlemm, T., Feldmann, J., Winkelmann, R., Levermann, A. (2022): Stabilizing effect of mélange buttressing on the marine ice-cliff instability of the West Antarctic Ice Sheet. - The Cryosphere, 16, 5, 1979-1996.
https://doi.org/10.5194/tc-16-1979-2022

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Item Permalink: https://publications.pik-potsdam.de/pubman/item/item_26925 Version Permalink: https://publications.pik-potsdam.de/pubman/item/item_26925_3
Genre: Journal Article

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 Creators:
Schlemm, Tanja1, Author              
Feldmann, Johannes1, Author              
Winkelmann, Ricarda1, Author              
Levermann, Anders1, Author              
Affiliations:
1Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Due 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 analyze 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 the 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 0.6 m within 100 a. By subjecting the exposed ice cliffs to cliff calving using our simplified parameterization, we also analyze the marine ice cliff instability (MICI). In our simulations it can double or even triple the sea level contribution depending on the only loosely constraint parameter which determines the maximum cliff-calving rate. The speed of MICI depends on this upper bound on the calving rate which is given by the ice mélange buttressing the glacier. However, stabilization of MICI may occur for geometric reasons. Since the embayment geometry changes as MICI advances into the interior of the ice sheet, the upper bound on calving rates is reduced and the progress of MICI is slowed down. Although we cannot claim that our simulations bear relevant quantitative estimates of the effect of ice-mélange buttressing on MICI, the mechanism has the potential to stop the instability. Further research is needed to evaluate its role for the past and future evolution of the Antarctic Ice Sheet.

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Language(s): eng - English
 Dates: 2021-06-302022-04-252022-05-242022-05
 Publication Status: Finally published
 Pages: 18
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: Organisational keyword: RD1 - Earth System Analysis
Organisational keyword: RD4 - Complexity Science
PIKDOMAIN: RD1 - Earth System Analysis
PIKDOMAIN: RD4 - Complexity Science
Model / method: PISM-PIK
Research topic keyword: Ice
Research topic keyword: Sea-level Rise
Research topic keyword: Tipping Elements
Research topic keyword: Oceans
Regional keyword: Arctic & Antarctica
DOI: 10.5194/tc-16-1979-2022
OATYPE: Gold Open Access
MDB-ID: No data to archive
 Degree: -

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Project name : PROTECT
Grant ID : 869304
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : TiPACCs
Grant ID : 820575
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : -
Grant ID : WI4556/4-1
Funding program : -
Funding organization : Deutsche Forschungsgemeinschaft (DFG)
Project name : -
Grant ID : WI4556/6-1
Funding program : -
Funding organization : Deutsche Forschungsgemeinschaft (DFG)
Project name : PalMod
Grant ID : 01LP1925D
Funding program : Research for Sustainability initiative (FONA)
Funding organization : Bundesministerium für Bildung und Forschung (BMBF)

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Title: The Cryosphere
Source Genre: Journal, SCI, Scopus, p3, oa
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Publ. Info: -
Pages: - Volume / Issue: 16 (5) Sequence Number: - Start / End Page: 1979 - 1996 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/140507
Publisher: Copernicus