Molar mass, surface tension, and droplet growth kinetics of marine organics from measurements of CCN activity

The CCN‐relevant properties and droplet growth kinetics are determined for marine organic matter isolated from seawater collected near the Georgia coast. The organic matter is substantially less CCN active than (NH4)2SO4, but droplet growth kinetics are similar. Köhler Theory Analysis (KTA) is used...

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Bibliographic Details
Published in:Geophysical research letters 2008-04, Vol.35 (7), p.n/a
Main Authors: Moore, R. H., Ingall, E. D., Sorooshian, A., Nenes, A.
Format: Article
Language:English
Subjects:
CCN
Earth sciences
Earth, ocean, space
Exact sciences and technology
Kohler theory analysis
marine organics
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Summary:The CCN‐relevant properties and droplet growth kinetics are determined for marine organic matter isolated from seawater collected near the Georgia coast. The organic matter is substantially less CCN active than (NH4)2SO4, but droplet growth kinetics are similar. Köhler Theory Analysis (KTA) is used to determine the average organic molar masses of two samples, which are 4370 ± 24% and 4340 ± 18% kg kmol−1. KTA is used to infer surface tension depression, which is in excellent agreement with direct measurements. For the first time it is shown that direct measurements of surface tension are relevant for CCN activation, and this study highlights the power of KTA.
ISSN:0094-8276
1944-8007
DOI:10.1029/2008GL033350