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Aerosol influences on low-level clouds in the West African monsoon

Taylor, Jonathan W.; Haslett, Sophie L.; Bower, Keith; Flynn, Michael; Crawford, Ian; Dorsey, James; Choularton, Tom; Connolly, Paul J.; Hahn, Valerian; Voigt, Christiane; Sauer, Daniel; Dupuy, Régis; Brito, Joel; Schwarzenboeck, Alfons; Bourriane, Thierry; Denjean, Cyrielle; Rosenberg, Phil; Flamant, Cyrille; Lee, James D.; Vaughan, Adam R.; ... mehr

Abstract (englisch):
Low-level clouds (LLCs) cover a wide area of southern West Africa (SWA) during the summer monsoon months and have an important cooling effect on the regional climate. Previous studies of these clouds have focused on modelling and remote sensing via satellite. We present the first comprehensive set of in situ measurements of cloud microphysics from the region, taken during June–July 2016, as part of the DACCIWA (Dynamics–aerosol–chemistry–cloud interactions in West Africa) campaign. This novel dataset allows us to assess spatial, diurnal, and day-to-day variation in the properties of these clouds over the region.

LLCs developed overnight and mean cloud cover peaked a few hundred kilometres inland around 10:00 local solar time (LST), before clouds began to dissipate and convection intensified in the afternoon. Regional variation in LLC cover was largely orographic, and no lasting impacts in cloud cover related to pollution plumes were observed downwind of major population centres.

The boundary layer cloud drop number concentration (CDNC) was locally variable inland, ranging from 200 to 840 cm−3 (10th and 90th percentiles at standard temperature and pressure), but showed no systematic regional variations. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000097694
Veröffentlicht am 21.08.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000097694
HGF-Programm 12.01.02 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 19
Heft 13
Seiten 8503–8522
Vorab online veröffentlicht am 04.07.2019
Nachgewiesen in Web of Science
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