文章基本信息

标题：Comparison of mean climate and rainfall interannual variability simulated from regional climate models over the Sahel
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作者：Ismaila Diallo ; Mouhamadou Bamba Sylla ; Amadou Thierno Gaye 等
期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2013
卷号：24
期号：2
页码：96-106
DOI：10.1684/sec.2013.0382
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Ismaila Diallo , Mouhamadou Bamba Sylla , Amadou Thierno Gaye , Moctar Camara Université Cheikh Anta Diop École supérieure polytechnique (UCAD-ESP) Laboratoire de physique de l’atmosphère et de l’océan Siméon Fongang (LPAO-SF) BP 5085 Dakar-Fann Sénégal, Loyola Marymount University Seaver College of Science and Engineering Department of Civil Engineering and Environmental Science Los Angeles CA90045 États-Unis, Université de Ziguinchor Ziguinchor Sénégal Key words: interannual variability, monsoon flux, rainfall, regional climate model, Sahel DOI : 10.1684/sec.2013.0382 Page(s) : 96-106 Published in: 2013 The purpose of this study is to evaluate the performance of a set of regional climate models (RCMs) in simulating the mean climatology and the interannual variability of rainfall over the Sahel. We analyzed and compared RCMs outputs within the framework of the ENSEMBLES project. The RCMs are in the same horizontal resolution and are driven by the same lateral boundary condition, the ERA-Interim, which is the latest version of the European Centre for Medium Range Weather Forecasts (ECMWF) reanalysis. The analysis focuses on the period of the monsoon peak (June-July-August [JJA]) over the Sahel. Temperature and precipitation distributions are reasonably well simulated although a few cold and dry biases are present around the Guinean coast and regions of steep topography. All RCMs, except HIRHAM, replicate reasonably well the interannual rainfall anomalies over the Sahel in both sign and magnitude. HIRHAM misses the occurrence of individual anomaly as well as the overall variability. This deficiency can be linked to a simulated weak low-level southwest monsoon flux and a strong harmattan flux from the Sahara desert propagating over the Sahel during observed wet years.
关键词：interannual variability; monsoon flux; rainfall; regional climate model; Sahel