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Article Dans Une Revue Climate Dynamics Année : 2011

Testing WRF capability in simulating the atmospheric water cycle over East Africa

Résumé

Uncertainties in simulating the seasonal mean atmospheric water cycle in Equatorial East Africa are quantified using 58 one-year-long experiments performed with the Weather Research and Forecasting model (WRF). Tested parameters include physical parameterizations of atmospheric convection, cloud microphysics, planetary boundary layer, land-surface model and radiation schemes, as well as land-use categories, lateral forcings (ERA-Interim and ERA40 reanalyses), and domain geometry (size and vertical resolution). Results show that (i) uncertainties, defined as the differences between the experiments, are larger than the biases; (ii) the parameters exerting the largest influence on simulated rainfall are, in order of decreasing importance, the shortwave radiation scheme, the land-surface model, the domain size, followed by convective schemes and land-use categories; (iii) cloud microphysics, lateral forcing reanalysis, the number of vertical levels and planetary boundary layer schemes appear to be of lesser importance at the seasonal scale. Though persisting biases (consisting of conditions that are too wet over the Indian Ocean and the Congo Basin and too dry over eastern Kenya) prevail in most experiments, several configurations simulate the regional climate with reasonable accuracy.

Dates et versions

hal-00553310 , version 1 (07-01-2011)

Identifiants

Citer

Benjamin Pohl, Julien Crétat, Pierre Camberlin. Testing WRF capability in simulating the atmospheric water cycle over East Africa. Climate Dynamics, 2011, 37, pp.1357-1379. ⟨10.1007/s00382-011-1024-2⟩. ⟨hal-00553310⟩
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