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Communication incl. Poster: BibTeX citation key:  Xuea
Xue, Y., De Sales, F., Lau, W. K.-M., Boone, A., Feng, J., Dirmeyer, P., Guo, Z., Kim, K.-M., Akio, K., Kumar, V., Poccard-Leclercq, I., Mahowald, N., Moufouma-Okia, W., Schemm, J. K., Schubert, S. D., Sealy, A., Thiaw, W. M., Vintzileos, A. & Wu, M.-L. C. 2009. GCM Intercomparison of West African Monsoon and its variability in the West African Monsoon Modeling and Evaluation Project (WAMME) 1st Experiment. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Last Edited by: Deleted user 2009-09-15 13:58:40
Categories: Atmospheric processes, Monsoon system and its variability, Weather to Climatic modelling and forecasting
Creators: Akio, Boone, De Sales, Dirmeyer, Feng, Guo, Kim, Kumar, Lau, Mahowald, Moufouma-Okia, Poccard-Leclercq, Schemm, Schubert, Sealy, Thiaw, Vintzileos, Wu, Xue
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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This paper evaluates ten West African Monsoon Modeling and Evaluation Project (WAMME) General Circulation Models’ (GCM) performances in simulating variability of WAM precipitation, surface temperature, and major circulation features at seasonal, intraseasonal, and diurnal scales based on the first WAMME experiment. The analyses indicate that models with specified sea surface temperature generally have reasonable simulations of the spatial distribution of WAM seasonal mean precipitation and surface temperature as well as of the averaged zonal wind in latitude-height cross-section and low level circulation. But there are deficiencies in simulating seasonal WAM precipitation evolutions. Furthermore, the majority of models fail to produce proper African Easterly Jet (AEJ) evolution and daily precipitation frequency distribution. By far, WAMME multi-model ensembles produce the best WAM precipitation spatial distribution and intensity, compared with individual models or reanalysis data. Preliminary investigations of some major WAM features are conducted. Common empirical orthorgonal functions (CEOF) analysis is applied to characterize the WAM precipitation and heat low northward movement. It is found that the WAM precipitation northward development is closely associated with an enhanced heat low in the Sahara and a weakened positive heat anomaly in the Sahel. Furthermore, the close relationship between WAM precipitation evolution and changes in the surface temperature diurnal cycle, as well as AEJ evolution, are discussed.
Last Edited by: Deleted user    Added by: Deleted user