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Koné B., Diedhiou Arona, Touré N. E., Sylla M. B., Giorgi F., Anquetin S., Bamba A., Diawara A., Kobea A. T. (2018). Sensitivity study of the regional climate model RegCM4 to different convective schemes over West Africa. Earth System Dynamics, 9 (4), 1261-1278. ISSN 2190-4979

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-11/010074413.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.5194/esd-9-1261-2018

Titre
Sensitivity study of the regional climate model RegCM4 to different convective schemes over West Africa
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000449656400001
AuteursKoné B., Diedhiou Arona, Touré N. E., Sylla M. B., Giorgi F., Anquetin S., Bamba A., Diawara A., Kobea A. T.
SourceEarth System Dynamics, 2018, 9 (4), p. 1261-1278. ISSN 2190-4979
RésuméThe latest version of RegCM4 with CLM4.5 as a land surface scheme was used to assess the performance and sensitivity of the simulated West African climate system to different convection schemes. The sensitivity studies were performed over the West African domain from November 2002 to December 2004 at a spatial resolution of 50 km x 50 km and involved five convective schemes: (i) Emanuel; (ii) Grell; (iii) Emanuel over land and Grell over ocean (Mix1); (iv) Grell over land and Emanuel over ocean (Mix2); and (v) Tiedtke. All simulations were forced with ERA-Interim data. Validation of surface temperature at 2 m and precipitation were conducted using data from the Climate Research Unit (CRU), Global Precipitation Climatology Project (GPCP) and the Tropical Rainfall Measurement Mission (TRMM) during June to September (rainy season), while the simulated atmospheric dynamic was compared to ERA-Interim data. It is worth noting that the few previous similar sensitivity studies conducted in the region were performed using BATS as a land surface scheme and involved less convective schemes. Compared with the previous version of RegCM, RegCM4-CLM also shows a general cold bias over West Africa whatever the convective scheme used. This cold bias is more reduced when using the Emanuel convective scheme. In terms of precipitation, the dominant feature in model simulations is a dry bias that is better reduced when using the Emanuel convective scheme. Considering the good performance with respect to a quantitative evaluation of the temperature and precipitation simulations over the entire West African domain and its subregions, the Emanuel convective scheme is recommended for the study of the West African climate system.
Plan de classementSciences du milieu [021] ; Limnologie physique / Océanographie physique [032] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.AFRIQUE DE L'OUEST ; ZONE SAHELIENNE ; ZONE GUINEENNE ; ZONE TROPICALE
LocalisationFonds IRD [F B010074413]
Identifiant IRDfdi:010074413
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010074413

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