Analysis of the atmospheric circulation simulated by GCMs over Greenland

The variability of the geopotential height at 500 hPa simulated by General Circulation Models (GCMs) over Greenland is evaluated using an atmospheric circulation type classification. The GCM outputs for the current climate (20C3M) are first compared to reanalysis data over 1961-1990. The comparison...

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Bibliographic Details
Main Authors: Belleflamme, Alexandre, Fettweis, Xavier, Erpicum, Michel
Format: Conference Object
Language:English
Published: 2010
Subjects:
General Circulation models
Greenland
Atmospheric circulation
Atmospheric circulation type classification
COST733 action
Modèles de circulation générale
Groenland
Circulation atmosphérique
Classification de types de circulations atmosphériques
Action COST733
Physical
chemical
mathematical & earth Sciences
Earth sciences & physical geography
Physique
chimie
mathématiques & sciences de la terre
Sciences de la terre & géographie physique
Ice Sheet
Online Access:https://orbi.uliege.be/handle/2268/75356
https://orbi.uliege.be/bitstream/2268/75356/1/a_belleflamme_meteoclim_2010.pdf
Description
Summary:The variability of the geopotential height at 500 hPa simulated by General Circulation Models (GCMs) over Greenland is evaluated using an atmospheric circulation type classification. The GCM outputs for the current climate (20C3M) are first compared to reanalysis data over 1961-1990. The comparison shows that most of them simulate well the main circulation types but fail to reproduce their frequencies because of underestimations of circulation variability and biases in the mean geopotential height. GCM-based future projections do not individualise new circulation types but show a general increase of the geopotential height. Based on this approach, the correlation between surface temperature and atmospheric circulation offers a new way for estimating the Greenland ice sheet melt.

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