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

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Title: Results from the Ice-Sheet Model Intercomparison Project–Heinrich Event INtercOmparison (ISMIP HEINO)
Authors: Calov, Reinhard Browse this author
Greve, Ralf Browse this author →KAKEN DB
Abe-Ouchi, Ayako Browse this author
Bueler, Ed Browse this author
Huybrechts, Philippe Browse this author
Johnson, Jesse V. Browse this author
Pattyn, Frank Browse this author
Pollard, David Browse this author
Ritz, Catherine Browse this author
Saito, Fuyuki Browse this author
Tarasov, Lev Browse this author
Keywords: Ice sheet
Model intercomparison
ISMIP
Heinrich event
Instability
Issue Date: 1-Aug-2010
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 56
Issue: 197
Start Page: 371
End Page: 383
Publisher DOI: 10.3189/002214310792447789
Abstract: 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.
Rights: © 2010 International Glaciological Society
Relation: http://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/44808
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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