Title: Daily Characteristics of West African Summer Monsoon Precipitation in CORDEX Simulations
Authors: KLUTSE Nana Ama BrowneSYLLA Mouhamadou BambaDIALLO IsmailaSARR AbdoulayeDOSIO AlessandroDIEDHIOU AronaKAMGA AndreLAMPTEY BenjaminABDOU AliGBOBANIY EmiolaOWUSU KwadwoLENNARD ChristopherHEWITSON BruceNIKULIN GrigoryPANITZ Hans-JuergenBUECHNER Matthias
Citation: THEORETICAL AND APPLIED CLIMATOLOGY vol. 123 no. 1 p. 369-386
Publication Year: 2016
JRC N°: JRC89457
ISSN: 0177-798X
URI: http://link.springer.com/article/10.1007/s00704-014-1352-3#
DOI: 10.1007/s00704-014-1352-3
Type: Articles in periodicals and books
Abstract: We analyze and intercompare the performance of a set of ten Regional Climate Models (RCMs) along with the ensemble mean of their statistics in simulating daily precipitation characteristics during the West African Monsoon (WAM) period (JJAS: June-July-August-September). The experiments are conducted within the framework of the COordinated Regional Downscaling Experiments (CORDEX) for the African domain. We find that the RCMs exhibit substantial differences that are associated with a wide range of estimates of higher order statistics, such as intensity, frequency and daily extremes mostly driven by the convective scheme employed. For instance, a number of the RCMs simulate a similar number of wet days compared to observations but greater rainfall intensity, especially in oceanic regions adjacent to the Guinea Highlands because of a larger number of heavy precipitation events. Other models exhibit a higher wet-day frequency but much lower rainfall intensity over West Africa due to the occurrence of less frequent heavy rainfall events. This indicates the existence of large uncertainties related to the simulation of daily rainfall characteristics by the RCMs. The ensemble mean of the indices substantially improves the RCMs simulated frequency and intensity of precipitation events, moderately outperforms that of the 95th percentile and provides mixed benefits for the dry and wet spells. Although the ensemble mean improved results cannot be generalized, such an approach produces encouraging results and can help, to some extent, to improve the robustness of the response of the West African Monsoon (WAM) daily precipitation to the anthropogenic GHGs warming.
JRC Directorate:Sustainable Resources

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