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DOI: 10.5445/IR/1000042092

Impact of aerosol on post-frontal convective clouds over Germany

Rieger, D.; Bangert, M.; Kottmeier, C.; Vogel, H.; Vogel, B.

Abstract:
We carried out simulations with predefined and simulated aerosol distributions in order to investigate the improvement in the forecasting capabilities of an operational weather forecast model by the use of an improved aerosol representation. This study focuses on convective cumulus clouds developing after the passage of a cold front on 25 April 2008 over Germany. The northerly flow after the cold front leads to increased sea salt aerosol concentrations compared to prefrontal conditions. High aerosol number concentrations are simulated in the interactive scenario representing typically polluted conditions. Nevertheless, due to the presence of sea salt particles, effective radii of cloud droplets reach values typical of pristine clouds (between 7 µm and 13 µm) at the same time. Compared to the predefined continental and maritime aerosol scenarios, the simulated aerosol distribution leads to a significant change in cloud properties such as cloud droplet radii and number concentrations. Averaged over the domain covered by the convective cumuli clouds, we found a systematic decrease in precipitation with increasing aerosol number concent ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 0280-6509, 1600-0889
URN: urn:nbn:de:swb:90-420928
KITopen ID: 1000042092
HGF-Programm 12.03.03; LK 01
Erschienen in Tellus / B
Band 66
Heft 1
Seiten 22528/1-15
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte aerosol–cloud interaction, precipitation, natural aerosol, anthropogenic aerosol, regional modelling
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