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Low-level stratiform clouds and dynamical features observed within the southern West African monsoon

Dione, Cheikh; Lohou, Fabienne; Lothon, Marie; Adler, Bianca; Babić, Karmen; Kalthoff, Norbert; Pedruzo-Bagazgoitia, Xabier; Bezombes, Yannick; Gabella, Omar

Abstract (englisch):
During the boreal summer, the monsoon season that takes place in West Africa is accompanied by low stratus clouds over land that stretch from the Guinean coast several hundred kilometers inland. Numerical climate and weather models need finer description and knowledge of cloud macrophysical characteristics and of the dynamical and thermodynamical structures occupying the lowest troposphere, in order to be properly evaluated in this region. The Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) field experiment, which took place in summer 2016, addresses this knowledge gap. Low-level atmospheric dynamics and stratiform low-level cloud macrophysical properties are analyzed using in situ and remote sensing measurements continuously collected from 20 June to 30 July at Savè, Benin, roughly 180 km from the coast. The macrophysical characteristics of the stratus clouds are deduced from a ceilometer, an infrared cloud camera, and cloud radar. Onset times, evolution, dissipation times, base heights, and thickness are evaluated. The data from an ultra-high-frequency (UHF) wind profiler, a microwave radiometer, and an energy balance station are used to quantify the occurrence and characteristics of the monsoon flow, the nocturnal low-level jet, and the cold air mass inflow propagating northward from the coast of the Gulf of Guinea. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000096581
Veröffentlicht am 17.07.2019
Originalveröffentlichung
DOI: 10.5194/acp-19-8979-2019
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: 1000096581
HGF-Programm 12.01.02 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 19
Heft 13
Seiten 8979–8997
Vorab online veröffentlicht am 16.07.2019
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