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The role of moist convection in the West African monsoon system

Marsham, J. H.; Parker, D. J.; Birch, C. E.; Knippertz, P.; Garcia-Carreras, L.; Provod, M.; Roberts, A. J.

Abstract (englisch):
The role of moist convection in the West African Monsoon system
Moist convection is integral to the West African monsoon (WAM) system, but until recently computational limits have made analysis of its role very challenging. Now, recent advances in computing, combined with new observations from this highly data-sparse region, have now provided many new insights. Moist convection provides most rainfall in the WAM region, with many organised mesoscale systems over the Sahel, and less organised convection closer to the coast. Multi-day continental-scale simulations of the WAM that explicitly resolve moist convection, show how representing convection explicitly allows greater latent and radiative heating further north, with latent heating later in the day. This weakens the Sahel-Sahara pressure gradient and the resultant flow of moisture into the Sahara, delaying its diurnal cycle and changing interactions between the monsoon and dry boundary-layer convection. This changes the water budget of the whole WAM system. Furthermore, in explicit runs, cold storm outflows provide a significant component of the monsoon flux. These insights provi ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Vortrag
Jahr 2016
Sprache Englisch
Identifikator KITopen ID: 1000065050
HGF-Programm 12.01.02; LK 01
Erschienen in HD(CP)2 Understanding Clouds and Precipitation 2016, 15–19 February 2016, Berlin, Germany
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