Results from the Ice-Sheet Model Intercomparison Project-Heinrich Event INtercOmparison (ISMIP HEINO) - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Journal of Glaciology Year : 2010

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

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 large-scale 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.

Domains

Glaciology
Fichier principal
Vignette du fichier
results-from-the-ice-sheet-model-intercomparison-projectheinrich-event-intercomparison-ismip-heino-1.pdf (1.22 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-00554220 , version 1 (24-03-2021)

Licence

Attribution

Identifiers

Cite

R. Calov, R. Greve, A. Abe-Ouchi, E. Bueler, P. Huybrechts, et al.. Results from the Ice-Sheet Model Intercomparison Project-Heinrich Event INtercOmparison (ISMIP HEINO). Journal of Glaciology, 2010, 56 (197), pp.371-383. ⟨10.3189/002214310792447789⟩. ⟨insu-00554220⟩
99 View
27 Download

Altmetric

Share

Gmail Facebook X LinkedIn More