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20 July 2018
Article (Scientific journals)
Global Radiative Flux and Cloudiness Variability for the Period 1959–2010 in Belgium: A Comparison between Reanalyses and the Regional Climate Model MAR
Wyard, Coraline  ; Doutreloup, Sébastien  ; Belleflamme, Alexandre et al.
2018 • In Atmosphere, 9 (7), p. 262
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Keywords :
regional and mesoscale modelling; reanalysis; global radiative flux; cloud cover; europe
Abstract :
[en] The use of regional climate models (RCMs) can partly reduce the biases in global radiative flux (Eg↓) that are found in reanalysis products and global models, as they allow for a finer spatial resolution and a finer parametrisation of surface and atmospheric processes. In this study, we assess the ability of the MAR («Modèle Atmosphérique Régional») RCM to reproduce observed changes in Eg↓, and we investigate the added value of MAR with respect to reanalyses. Simulations were performed at a horizontal resolution of 5 km for the period 1959–2010 by forcing MAR with different reanalysis products: ERA40/ERA-interim, NCEP/NCAR-v1, ERA-20C, and 20CRV2C. Measurements of Eg↓ from the Global Energy Balance Archive (GEBA) and from the Royal Meteorological Institute of Belgium (RMIB), as well as cloud cover observations from Belgocontrol and RMIB, were used for the evaluation of the MAR model and the forcing reanalyses. Results show that MAR enables largely reducing the mean biases that are present in the reanalyses. The trend analysis shows that only MAR forced by ERA40/ERA-interim shows historical trends, which is probably because ERA40/ERA-interim has a better horizontal resolution and assimilates more observations than the other reanalyses that are used in this study. The results suggest that the solar brightening observed since the 1980s in Belgium has mainly been due to decreasing cloud cover.
Research center :
Sphères - SPHERES
Disciplines :
Earth sciences & physical geography
Author, co-author :
Wyard, Coraline ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Doutreloup, Sébastien  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Belleflamme, Alexandre;  Université de Liège - ULiège > Géographie > Climatologie et Topoclimatologie
Wild, Martin;  ETH Zurich > Institute for Atmospheric and Climate Science
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Language :
English
Title :
Global Radiative Flux and Cloudiness Variability for the Period 1959–2010 in Belgium: A Comparison between Reanalyses and the Regional Climate Model MAR
Publication date :
13 July 2018
Journal title :
Atmosphere
eISSN :
2073-4433
Publisher :
MDPI, Basel, Switzerland
Special issue title :
Regional Climate Modeling
Volume :
9
Issue :
7
Pages :
262
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture

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