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Communication incl. Poster: BibTeX citation key:  IssaLelea
Issa Lélé, M. A., Lamb, P. J. & Leslie, L. M. 2009. WRF-ARW high resolution simulation of West African monsoon during 2006 AMMA Enhanced Observation Period: evolution and diurnal variations. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: Devic 2009-09-07 11:23:05    Last Edited by: roussot 2009-11-05 13:50:23
Categories: Weather to Climatic modelling and forecasting
Keywords: Modelling
Creators: Issa Lélé, Lamb, Leslie
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The West African monsoon system (WAMS) has been extensively studied on the large scale, where it was often described in terms of the variability of the Intertropical Convergence Zone (ITCZ) and its associated regional circulations. However, on the synoptic and mesoscale, WAMS structure and variability involve complex interactions between organized mesoscale convective systems (MCSs), wave patterns, deep convection, diurnal variations and associated rainfall. Hence, General Circulation Models (GCMs) have had difficulties in simulating these WAM features. Consequently, Numerical Weather Prediction (NWP) and Regional Climate Models (RCMs) currently are being increasing used to simulate the important climate components of WAM. Therefore, there is a need to extensively test these models before using them for real time operational forecasting. While the simulation of mesoscale and synoptic features of the WAM using some RCMs has been documented, little work has been done with the Weather Research and Forecasting (WRF) model which is another regional and weather climate model. The research reported is investigating the sensitivity of the modeled evolution and diurnal variation of the WAMS to convective parameterization schemes in terms of thermodynamic and circulation characteristics, stability profiles, and rainfall. Unlike previous studies that used coarser resolutions in simulating WAMS features, we are using the WRF model with a high resolution (12 and 4 km) in a three nested domain configuration. Model results for the 2006 monsoon season are compared with surface meteorological station observations and key AMMA radiosonde sites. The preliminary results show substantial differences in the modeled rainfall and atmospheric stability between the different simulations.
Last Edited by: roussot