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Advances in Meteorology
Volume 2010 (2010), Article ID 365131, 11 pages
http://dx.doi.org/10.1155/2010/365131
Research Article

The Influence of Algal Exudate on the Hygroscopicity of Sea Spray Particles

1Leibniz-Institute for Tropospheric Research, Permoser Strabe 15, 04318 Leipzig, Germany
2Centre for Atmospheric Sciences, University of Manchester, Manchester, M13 9PL, UK
3The Scottish Association for Marine Science, PA37 1QA Oban, UK

Received 7 February 2010; Accepted 7 June 2010

Academic Editor: Chris Osburn

Copyright © 2010 H. Wex et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We examined the effect of organic matter released by four different algal species on the hygroscopic growth and droplet activation behaviour of laboratory-generated marine aerosol particles. Hygroscopic growth factors and dry diameters for activation were reduced by less than 10%, compared to that of sodium chloride or of artificial seawater that was devoid of marine surfactants. Concentration-dependent nonideal behaviour was observed for the artificial seawater. But within measurement uncertainty, the measured hygroscopic growth and droplet activation behaviour for the samples that contained organic matter were consistent with a hygroscopicity parameter that was constant between the sub- and supersaturated measurement points. Also, the hygroscopic growth measured for hydrated particles after 3 and after 10 seconds was similar, which implies that in this time range no kinetic effects were detected.