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The representation of low-level clouds during the West African monsoon in weather and climate models

Kniffka, Anke; Hannak, L.; Knippertz, P.; Fink, A. H.

Abstract (englisch):
The West African monsoon is one of the most important large-scale circulation features in the tropics and the associated seasonal rainfalls are crucial to rain-fed agriculture and water resources for hundreds of millions of people. However, numerical weather and climate models still struggle to realistically represent salient features of the monsoon across a wide range of scales. Recently it has been shown that substantial errors in radiation and clouds exist in the southern parts of West Africa (8°W-8°E, 5-10°N) during summer. This area is characterised by strong low-level jets associated with the formation of extensive ultra-low stratus clouds. Often persisting long after sunrise, these clouds have a substantial impact on the radiation budget at the surface and thus the diurnal evolution of the planetary boundary layer (PBL). Here we present some first results from a detailed analysis of the representation of these clouds and the associated PBL features across a range of weather and climate models. Recent climate model simulations for the period 1991-2010 run in the framework of the Year of Tropical Convection (YOTC) offer a great ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Vortrag
Jahr 2016
Sprache Englisch
Identifikator KITopen ID: 1000064998
HGF-Programm 12.01.02; LK 01
Erschienen in EGU General Assembly, 17–22 April 2016, Vienna, A
Bemerkung zur Veröffentlichung EGU2016-4889
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