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  Simulating the Laurentide Ice Sheet of the Last Glacial Maximum

Moreno-Parada, D., Alvarez-Solas, J., Blasco, J., Montoya, M., Robinson, A. (2023): Simulating the Laurentide Ice Sheet of the Last Glacial Maximum. - The Cryosphere, 17, 5, 2139-2156.
https://doi.org/10.5194/tc-17-2139-2023

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Moreno-Parada, Daniel1, Author
Alvarez-Solas, Jorge1, Author
Blasco, Javier1, Author
Montoya, Marisa1, Author
Robinson, Alexander2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, Potsdam, ou_persistent13              

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 Abstract: In the last decades, great effort has been made to reconstruct the Laurentide Ice Sheet (LIS) during the Last Glacial Maximum (LGM; ca. 21 000 years before present, 21 kyr ago). Uncertainties underlying its modelling have led to notable differences in fundamental features such as its maximum elevation, extent and total volume. As a result, the uncertainty in ice dynamics and thus in ice extent, volume and ice stream stability remains large. We herein use a higher-order three-dimensional ice sheet model to simulate the LIS under LGM boundary conditions for a number of basal friction formulations of varying complexity. Their consequences for the Laurentide ice streams, configuration, extent and volume are explicitly quantified. Total volume and ice extent generally reach a constant equilibrium value that falls close to prior LIS reconstructions. Simulations exhibit high sensitivity to the dependency of the basal shear stress on the sliding velocity. In particular, a regularised Coulomb friction formulation appears to be the best choice in terms of ice volume and ice stream realism. Pronounced differences are found when the basal friction stress is thermomechanically coupled: the base remains colder, and the LIS volume is lower than in the purely mechanical friction scenario counterpart. Thermomechanical coupling is fundamental for producing rapid ice streaming, yet it leads to a similar ice distribution overall.

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Language(s): eng - English
 Dates: 2023-05-252023-05-25
 Publication Status: Finally published
 Pages: 18
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.5194/tc-17-2139-2023
PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: RD1 - Earth System Analysis
MDB-ID: No data to archive
OATYPE: Gold Open Access
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Title: The Cryosphere
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 17 (5) Sequence Number: - Start / End Page: 2139 - 2156 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/140507
Publisher: Copernicus