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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The WAMME regional model intercomparison study
Climate Dynamics, Volume 35, No. 1, Year 2010
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Description
Results from five regional climate models (RCMs) participating in the West African Monsoon Modeling and Evaluation (WAMME) initiative are analyzed. The RCMs were driven by boundary conditions from National Center for Environmental Prediction reanalysis II data sets and observed sea-surface temperatures (SST) over four May-October seasons, (2000 and 2003-2005). In addition, the simulations were repeated with two of the RCMs, except that lateral boundary conditions were derived from a continuous global climate model (GCM) simulation forced with observed SST data. RCM and GCM simulations of precipitation, surface air temperature and circulation are compared to each other and to observational evidence. Results demonstrate a range of RCM skill in representing the mean summer climate and the timing of monsoon onset. Four of the five models generate positive precipitation biases and all simulate negative surface air temperature biases over broad areas. RCM spatial patterns of June-September mean precipitation over the Sahel achieve spatial correlations with observational analyses of about 0.90, but within two areas south of 10°N the correlations average only about 0.44. The mean spatial correlation coefficient between RCM and observed surface air temperature over West Africa is 0.88. RCMs show a range of skill in simulating seasonal mean zonal wind and meridional moisture advection and two RCMs overestimate moisture convergence over West Africa. The 0.5° computing grid enables three RCMs to detect local minima related to high topography in seasonal mean meridional moisture advection. Sensitivity to lateral boundary conditions differs between the two RCMs for which this was assessed. The benefits of dynamic downscaling the GCM seasonal climate prediction are analyzed and discussed. © 2009 The Author(s).
Authors & Co-Authors
Druyan, Leonard M.
United States, New York
Nasa Goddard Institute for Space Studies
Feng, Jinming
China, Beijing
Institute of Atmospheric Physics Chinese Academy of Sciences
United States, Los Angeles
University of California, Los Angeles
Cook, Kerry H.
United States, Austin
Jackson School of Geosciences
Yongkang Xue, Yongkang
United States, Los Angeles
University of California, Los Angeles
Fulakeza, Matthew
United States, New York
Nasa Goddard Institute for Space Studies
Hagos, Samson M.
United States, Miami
Rosenstiel School of Marine and Atmospheric Science
Konaré, Abdourahamane
Cote D'ivoire, Abidjan
Université de Cocody-abidjan
Moufouma-Okia, Wilfran
United Kingdom, Exeter
Met Office
Rowell, David P.
United Kingdom, Exeter
Met Office
Vizy, Edward K.
United States, Austin
Jackson School of Geosciences
Ibrah, Seidou Sanda
Niger, Niamey
Universite Abdou Moumouni
Statistics
Citations: 98
Authors: 11
Affiliations: 8
Identifiers
Doi:
10.1007/s00382-009-0676-7
ISSN:
09307575
e-ISSN:
14320894
Research Areas
Environmental
Study Locations
Multi-countries