Bodjrenou R., Cohard J. M., Hector Basile, Lawin E. A., Chagnaud G., Danso D. K., M'po Y. N., Badou F., Ahamide B. (2023). Evaluation of reanalysis estimates of precipitation, radiation, and temperature over Benin (West Africa). Journal of Applied Meteorology and Climatology, 62 (8), p. 1005-1022. ISSN 1558-8424.
Titre du document
Evaluation of reanalysis estimates of precipitation, radiation, and temperature over Benin (West Africa)
Année de publication
2023
Auteurs
Bodjrenou R., Cohard J. M., Hector Basile, Lawin E. A., Chagnaud G., Danso D. K., M'po Y. N., Badou F., Ahamide B.
Source
Journal of Applied Meteorology and Climatology, 2023,
62 (8), p. 1005-1022 ISSN 1558-8424
In West Africa, climatic data issues, especially availability and quality, remain a significant constraint to the development and application of distributed hydrological modeling. As alternatives to ground-based observations, reanaly-sis products have received increasing attention in recent years. This study aims to evaluate three reanalysis products, namely, ERA5, Water and Global Change (WATCH) Forcing Data (WFD) ERA5 (WFDE5), and MERRA-2, from 1981 to 2019 to determine their ability to represent four hydrological climates variables over a range of space and time scales in Benin. The variables from the reanalysis products are compared with point station databased metrics Kling-Gupta effi- ciency (KGE), mean absolute error (MAE), correlation, and relative error in precipitation annual (REPA). The results show that ERA5 presents a better correlation for annual mean temperature (between 0.74 and 0.90) than do WFDE5 (0.63-0.78) and MERRA-2 (0.25-0.65). Both ERA5 and WFDE5 are able to reproduce the observed upward trend of tem-perature (0.2 & DEG;C decade -1) in the region. We noted a systematic cold bias of -1.3 & DEG;C in all reanalyses except WFDE5 (-0.1 & DEG;C). On the monthly time scale, the temperature of the region is better reproduced by ERA5 and WFDE5 (KGE & GE; 0.80) than by MERRA-2 (KGE , 0.5). At all time scales, WFDE5 produces the best MAE scores for longwave (LW) and shortwave (SW) radiation, followed by ERA5. WFDE5 also provides the best estimates for the annual precipitation (REPA 2 ]-25, 25[ and KGE & GE; 50% at most stations). ERA5 produces similar results, but MERRA-2 performs poorly in all the metrics. In addition, ERA5 and WFDE5 reproduce the bimodal rainfall regime in southern Benin, unlike MERRA-2, but all products have too many small rainfall events.
Plan de classement
Sciences du milieu [021]
;
Hydrologie [062]
Description Géographique
AFRIQUE DE L'OUEST ; BENIN
Localisation
Fonds IRD [F B010090127]
Identifiant IRD
fdi:010090127
