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Advances in Meteorology
Volume 2010 (2010), Article ID 482603, 10 pages
http://dx.doi.org/10.1155/2010/482603
Research Article

Contribution of Isoprene Oxidation Products to Marine Aerosol over the North-East Atlantic

1Finnish Meteorological Institute, Research and Development, Climate and Global Change, P.O. BOX 503, 00101 Helsinki, Finland
2Institute of Geophysics, University of Hamburg, KlimaCampus, Bundesstrasse 55, 20146 Hamburg, Germany
3School of Physics, Centre for Climate & Air Pollution Studies, Environmental Change Institute, National University of Ireland Galway, University Road, Galway, Ireland

Received 15 February 2010; Revised 14 May 2010; Accepted 21 June 2010

Academic Editor: Olaf Stetzer

Copyright © 2010 Tatu Anttila 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

Secondary organic aerosol (SOA) formation through isoprene oxidation was investigated with the regional-scale climate model REMOTE. The applied modeling scheme includes a treatment for marine primary organic aerosol emissions, aerosol microphysics, and SOA formation through the gas/particle partitioning of semivolatile, water-soluble oxidation products. The focus was on SOA formation taking place over the North-East Atlantic during a period of high biological activity. Isoprene SOA concentrations were up to ~5 ng over North Atlantic in the base case model runs, and isoprene oxidation made a negligible contribution to the marine organic aerosol (OA) mass. In particular, isoprene SOA did not account for the observed water-soluble organic carbon (WSOC) concentrations over North Atlantic. The performed model calculations, together with results from recent field measurements, imply a missing source of SOA over remote marine areas unless the isoprene oxidation products are considerably less volatile than the current knowledge indicates.