Sensitivity Study of the RegCM4’s Surface Schemes in the Simulations of West Africa Climate  

作　　者：Adjon Anderson Kouassi Brahima Kone Siélé Silue Alima Dajuma Toure E. N’datchoh Marcellin Adon Arona Diedhiou Véronique Yoboue Adjon Anderson Kouassi;Brahima Kone;Siélé Silue;Alima Dajuma;Toure E. N’datchoh;Marcellin Adon;Arona Diedhiou;Véronique Yoboue(Laboratoire des Sciences et Technologie de l’Environnement (LSTE), Université Jean Lorougnon Guédé, Daloa, Côte d’Ivoire;Laboratoire des Sciences de la Matière, de l’Environnement et de l’Energie Solaire (LASMES), Université Félix Houphouët-Boigny, Abidjan, Côte d’Ivoire;Université Péléforo Gon Coulibaly, Korhogo, Côte d’Ivoire;Université Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE, Grenoble, France)

机构地区：[1]Laboratoire des Sciences et Technologie de l’Environnement (LSTE), Université Jean Lorougnon Guédé, Daloa, Cô te d’Ivoire [2]Laboratoire des Sciences de la Matière, de l’Environnement et de l’Energie Solaire (LASMES), Université Félix Houphouë t-Boigny, Abidjan, Cô te d’Ivoire [3]Université Péléforo Gon Coulibaly, Korhogo, Cô te d’Ivoire [4]Université Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE, Grenoble, France

出　　处：《Atmospheric and Climate Sciences》2022年第1期86-104,共19页大气和气候科学（英文）

摘　　要：Two simulations of five years (2003-2007) were conducted with the Regional Climate models RegCM4, one coupled with Land surface models BATS and the other with CLM4.5 over West Africa, where simulated air temperature and precipitation were analyzed. The purpose of this study is to assess the performance of RegCM4 coupled with the new CLM4.5 Land</span><span style="font-family:""> </span><span style="font-family:Verdana;">surface scheme and the standard one named BATS in order to find the best configuration of RegCM4 over West African. This study could improve our understanding of the sensitivity of land surface model in West Africa climate simulation, and provide relevant information to RegCM4 users. The results show fairly realistic restitution of West Africa’s climatology and indicate correlations of 0.60 to 0.82 between the simulated fields (BATS and CLM4.5) for precipitation. The substitution of BATS surface scheme by CLM4.5 in the model configuration, leads mainly to an improvement of precipitation over the Atlantic Ocean, however, the impact is not sufficiently noticeable over the continent. While the CLM4.5 experiment restores the seasonal cycles and spatial distribution, the biases increase for precipitation and temperature. Positive biases already existing with BATS are amplified over some sub-regions. This study concludes that temporal localization (seasonal effect), spatial distribution (grid points) and magnitude of precipitation and temperature (bias) are not simultaneously improved by CLM4.5. The introduction of the new land surface scheme CLM4.5, therefore, leads to a performance of the same order as that of BATS, albeit with a more detailed formulation.Two simulations of five years (2003-2007) were conducted with the Regional Climate models RegCM4, one coupled with Land surface models BATS and the other with CLM4.5 over West Africa, where simulated air temperature and precipitation were analyzed. The purpose of this study is to assess the performance of RegCM4 coupled with the new CLM4.5 Land</span><span style="font-family:""> </span><span style="font-family:Verdana;">surface scheme and the standard one named BATS in order to find the best configuration of RegCM4 over West African. This study could improve our understanding of the sensitivity of land surface model in West Africa climate simulation, and provide relevant information to RegCM4 users. The results show fairly realistic restitution of West Africa’s climatology and indicate correlations of 0.60 to 0.82 between the simulated fields (BATS and CLM4.5) for precipitation. The substitution of BATS surface scheme by CLM4.5 in the model configuration, leads mainly to an improvement of precipitation over the Atlantic Ocean, however, the impact is not sufficiently noticeable over the continent. While the CLM4.5 experiment restores the seasonal cycles and spatial distribution, the biases increase for precipitation and temperature. Positive biases already existing with BATS are amplified over some sub-regions. This study concludes that temporal localization (seasonal effect), spatial distribution (grid points) and magnitude of precipitation and temperature (bias) are not simultaneously improved by CLM4.5. The introduction of the new land surface scheme CLM4.5, therefore, leads to a performance of the same order as that of BATS, albeit with a more detailed formulation.

关 键 词：Regional Climate Model Land Surface Scheme West Africa Climate REGCM Precipitation West African Monsoon Simulated Data 

分 类 号：P46[天文地球—大气科学及气象学]