Articles | Volume 15, issue 20
https://doi.org/10.5194/acp-15-11701-2015
https://doi.org/10.5194/acp-15-11701-2015
Research article
 | 
21 Oct 2015
Research article |  | 21 Oct 2015

Observations of new particle formation in enhanced UV irradiance zones near cumulus clouds

B. Wehner, F. Werner, F. Ditas, R. A. Shaw, M. Kulmala, and H. Siebert

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Short summary
During the CARRIBA campaign on Barbados, 91 cases with increased aerosol particle number concentrations near clouds were detected from helicopter-borne measurements. Most of these cases are correlated with enhanced irradiance in the ultraviolet range. The events have a mean length of 100m, corresponding to a lifetime of 300s, meaning a growth of several nm/h. Such high values cannot be explained by sulfuric acid alone; thus extremely low volatility organic compounds are probably involved here.
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