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The radiative impact of out-of-cloud aerosol hygroscopic growth during the summer monsoon in southern West Africa

Haslett, Sophie L.; Taylor, Jonathan W.; Deetz, Konrad 1; Vogel, Bernhard 1; Babić, Karmen 1; Kalthoff, Norbert 1; Wieser, Andreas 1; Dione, Cheikh; Lohou, Fabienne; Brito, Joel; Dupuy, Régis; Schwarzenboeck, Alfons; Zieger, Paul; Coe, Hugh
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

Water in the atmosphere can exist in the solid, liquid or gas phase. At high humidities, if the aerosol population remains constant, more water vapour will condense onto the particles and cause them to swell, sometimes up to several times their original size. This significant change in size and chemical composition is termed hygroscopic growth and alters a particle's optical properties. Even in unsaturated conditions, this can change the aerosol direct effect, for example by increasing the extinction of incoming sunlight. This can have an impact on a region's energy balance and affect visibility. Here, aerosol and relative humidity measurements collected from aircraft and radiosondes during the Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) campaign were used to estimate the effect of highly humid layers of air on aerosol optical properties during the monsoon season in southern West Africa. The effects of hygroscopic growth in this region are of particular interest due to the regular occurrence of high humidity and the high levels of pollution in the region. The Zdanovskii, Stokes and Robinson (ZSR) mixing rule is used to estimate the hygroscopic growth of particles under different conditions based on chemical composition. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000090938
Veröffentlicht am 13.02.2019
Originalveröffentlichung
DOI: 10.5194/acp-19-1505-2019
Scopus
Zitationen: 16
Web of Science
Zitationen: 16
Dimensions
Zitationen: 21
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 1680-7324
urn:nbn:de:swb:90-909380
KITopen-ID: 1000090938
HGF-Programm 12.01.02 (POF III, LK 01) Proc.res.f.multisc.predictab.of weather
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 19
Heft 3
Seiten 1505–1520
Vorab online veröffentlicht am 05.02.2019
Nachgewiesen in Dimensions
Web of Science
Scopus
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