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What controls the formation of nocturnal low-level stratus clouds over southern West Africa during the monsoon season?

Babić, Karmen; Kalthoff, Norbert; Adler, Bianca; Quinting, Julian F.; Lohou, Fabienne; Dione, Cheikh; Lothon, Marie

Abstract:
Nocturnal low-level stratus clouds (LLCs) are frequently observed in the atmospheric boundary layer (ABL) over southern West Africa (SWA) during the summer monsoon season. Considering the effect these clouds have on the surface energy and radiation budgets as well as on the diurnal cycle of the ABL, they are undoubtedly important for the regional climate. However, an adequate representation of LLCs in the state-of-the-art weather and climate models is still a challenge, which is largely due to the lack of high-quality observations in this region and gaps in understanding of underlying processes. In several recent studies, a unique and comprehensive data set collected in summer 2016 during the DACCIWA (Dynamics-aerosol-chemistry-cloud interactions in West Africa) ground-based field campaign was used for the first observational analyses of the parameters and physical processes relevant for the LLC formation over SWA. However, occasionally stratus-free nights occur during the monsoon season as well. Using observations and ERA5 reanalysis, we investigate differences in the boundary-layer conditions during 6 stratus-free and 20 stratus nights observed during the DACCIWA campaign. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099717
Veröffentlicht am 08.11.2019
Originalveröffentlichung
DOI: 10.5194/acp-19-13489-2019
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000099717
HGF-Programm 12.01.02 (POF III, LK 01)
Proc.res.f.multisc.predictab.of weather
Erschienen in Atmospheric chemistry and physics
Band 19
Heft 21
Seiten 13489–13506
Vorab online veröffentlicht am 05.11.2019
Nachgewiesen in Web of Science
Scopus
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