Results From the Ice-Sheet Model Intercomparison Project-Heinrich Event INtercOmparison (ISMIP HEINO)

Results from the Heinrich Event INtercOmparison (HEINO) topic of the Ice-Sheet Model Intercomparison Project (ISMIP) are presented. ISMIP HEINO was designed to explore internal largescale ice-sheet instabilities in different contemporary ice-sheet models. These instabilities are of interest because...

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Bibliographic Details
Published in:Journal of Glaciology
Main Authors: Calov, Reinhard, Greve, Ralf, Abe-Ouchi, Ayako, Bueler, Ed, Huybrechts, Philippe, Johnson, Jesse V., Pattyn, Rank, Pollard, David, Ritz, Catherine, Saito, Fuyuki, Tarasov, Lev
Format: Text
Language:unknown
Published: ScholarWorks at University of Montana 2010
Subjects:
Computer Sciences
Hudson Bay
Hudson
Hudson Strait
Ice Sheet
Online Access:https://scholarworks.umt.edu/cs_pubs/2
https://doi.org/10.3189/002214310792447789
https://scholarworks.umt.edu/context/cs_pubs/article/1003/viewcontent/Results_From_the_Ice_Sheet_Model_Intercomparison_Project_Heinrich.pdf
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Summary:Results from the Heinrich Event INtercOmparison (HEINO) topic of the Ice-Sheet Model Intercomparison Project (ISMIP) are presented. ISMIP HEINO was designed to explore internal largescale ice-sheet instabilities in different contemporary ice-sheet models. These instabilities are of interest because they are a possible cause of Heinrich events. A simplified geometry experiment reproduces the main characteristics of the Laurentide ice sheet, including the sedimented region over Hudson Bay and Hudson Strait. The model experiments include a standard run plus seven variations. Nine dynamic/thermodynamic ice-sheet models were investigated; one of these models contains a combination of the shallow-shelf (SSA) and shallow-ice approximation (SIA), while the remaining eight models are of SIA type only. Seven models, including the SIA–SSA model, exhibit oscillatory surges with a period of ∼1000 years for a broad range of parameters, while two models remain in a permanent state of streaming for most parameter settings. In a number of models, the oscillations disappear for high surface temperatures, strong snowfall and small sediment sliding parameters. In turn, low surface temperatures and low snowfall are favourable for the ice-surge cycles. We conclude that further improvement of ice-sheet models is crucial for adequate, robust simulations of cyclic large-scale instabilities.

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