ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-6-4101-2006 Organics in the Northeastern Pacific and their impacts on aerosol hygroscopicity in the subsaturated and supersaturated regimes Kaku K. C. 1 Hegg D. A. 1 Covert D. S. 1 Santarpia J. L. 2 Jonsson H. 3 Buzorius G. 3 Collins D. R. 4 Department of Atmospheric Sciences, Seattle, WA, USA Edgewood Chemical Biological Center, Aberdeen Proving Grounds, MD, USA CIRPAS, Department of Research, NPS, Marina, CA, USA Texas A&M University, Department of Atmospheric Sciences, College Station, TX, USA 13 09 2006 6 12 4101 4115 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/6/4101/2006/acp-6-4101-2006.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/6/4101/2006/acp-6-4101-2006.pdf

Aerosol samples were collected by aircraft during the summer of 2004 in the Northeastern Pacific and compared to measurements of aerosol hygroscopicity. Chemical speciation analyses of the samples revealed that a significant portion of the marine aerosols was organic, and on average 8% of the total aerosol mass was insoluble organic material, tentatively attributed to natural marine emissions. Two chemical models were explored in an attempt to achieve closure between the marine aerosol chemical and physical properties through reproduction of the observed aerosol growth, both in the subsaturated and supersaturated regimes. Results suggest that at subsaturated relative humidities, the nonideal behavior of water activity with respect to aerosol chemistry has an important effect on aerosol growth. At supersaturations, the underprediction of critical supersaturations by all models suggests the hypothesis that formation of a complete monolayer by the insoluble organics may inhibit the activation of aerosols to form cloud droplets.

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