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Poster (Scientific congresses and symposiums)
Added value of the regional climate model MAR for simulating the surface mass balance of the Antarctic ice sheet compared to a global climate model (ACCESS1.3)
Kittel, Christoph  ; Amory, Charles  ; Agosta, Cécile  et al.
2019 • EGU General Assembly 2019
 

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Abstract :
[en] Due to their ability to produce climate projections, General circulation models (GCM) are often used to provide estimates of the surface mass balance (SMB) of the Antarctic ice sheet that can be used to constrain ice sheet models. However, GCM still benefit from a poor representation of polar climate specificities such as stable boundary layers, polar clouds or interactions between snow-covered surfaces and the atmosphere. In this study, we highlight the importance of downscaling GCM outputs from the Fifth Climate Model Intercomparison Project (CMIP5) with a regional climate model to provide accurate estimates of the Antarctic SMB. For that purpose, the regional climate model MAR is forced by 6-hourly outputs from ACCESS1.3 that is currently considered as one of the best GCM from CMIP5 over the Antarctic ice sheet. Estimates of the SMB computed by MAR and ACCESS1.3 are evaluated against SMB observations. Even if the temporal variability of the SMB is forced by the driving GCM, the comparison shows that MAR improves the spatial variability of the Antarctic SMB, emphasizing the added value of using a polar RCM for downscaling GCM outputs at high latitudes.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Kittel, Christoph  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Amory, Charles ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Agosta, Cécile ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Language :
English
Title :
Added value of the regional climate model MAR for simulating the surface mass balance of the Antarctic ice sheet compared to a global climate model (ACCESS1.3)
Publication date :
2019
Event name :
EGU General Assembly 2019
Event place :
Vienna, Austria
Event date :
7-12 April 2019
Audience :
International
Funders :
CÉCI - Consortium des Équipements de Calcul Intensif
F.R.S.-FNRS - Fonds de la Recherche Scientifique

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