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Descripción
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| West African societies are highly dependent on the West African Monsoon (WAM). Thus, a correct representationof the WAM in climate models is of paramount importance. In this article, the ability of 8 CMIP5 historical GeneralCirculation Models (GCMs) and 4 CORDEX-Africa Regional Climate Models (RCMs) to characterize the WAMdynamics and variability is assessed for the period July-August-September 1979?2004. Simulations are comparedwith observations. Uncertainties in RCM performance and lateral boundary conditions are assessed individually.Results show that both GCMs and RCMs have trouble to simulate the northward migration of the IntertropicalConvergence Zone in boreal summer. The greatest bias improvements are obtained after regionalization of themost inaccurate GCM simulations. To assess WAM variability, a Maximum Covariance Analysis is performedbetween Sea Surface Temperature and precipitation anomalies in observations, GCM and RCM simulations. Theassessed variability patterns are: El Niño-Southern Oscillation (ENSO); the eastern Mediterranean (MED); andthe Atlantic Equatorial Mode (EM). Evidence is given that regionalization of the ENSO?WAM teleconnectiondoes not provide any added value. Unlike GCMs, RCMs are unable to precisely represent the ENSO impact on airsubsidence over West Africa. Contrastingly, the simulation of the MED?WAM teleconnection is improved afterregionalization. Humidity advection and convergence over the Sahel area are better simulated by RCMs. Finally,no robust conclusions can be determined for the EM?WAM teleconnection, which cannot be isolated for the 1979?2004 period. The novel results in this article will help to select the most appropriate RCM simulations to studyWAM teleconnections under current and future climate scenarios. | |
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Internacional
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Si |
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Nombre congreso
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European Geosciences Union General Assembly 2018 |
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Tipo de participación
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970 |
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Lugar del congreso
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Viena |
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Revisores
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Si |
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ISBN o ISSN
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EGU2018-19615 |
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DOI
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Fecha inicio congreso
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08/04/2018 |
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Fecha fin congreso
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13/04/2018 |
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Título de las actas
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