Details for Primary Marine Organic Aerosol: A Dichotomy of Low Hygroscopicity and High CCN Activity

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Name:Primary Marine Organic Aerosol: A Dichotomy of Low Hygroscopicity and High CCN Activity
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Ovadnevaite, J., D. Ceburnis, J. Bialek, C. Monahan, G. Martucci, M. Rinaldi, M.C. Facchini, H. Berresheim, D. R. Worsnop and C. O’Dowd. Primary Marine Organic Aerosol: A Dichotomy of Low Hygroscopicity and High CCN Activity, Geophys. Res. Letts, 38, L21806, doi:10.1029/2011GL048869., 2011


Abstract. High-time resolution measurements of primary marine organic sea-spray physico-chemical properties reveal an apparent dichotomous behavior in terms of water uptake: specifically sea-spray aerosol enriched in organic matter possesses a low hydroscopic Growth Factor (GF~1.25) while simultaneously having a cloud condensation nucleus/condensation nuclei (CCN/CN) activation efficiency of between 83% at 0.25% supersaturation and 100% at 0.75%. In contrast, the activation efficiency of particles dominated by non-sea-salt (nss)-sulfate ranged between 48-100% over supersaturation range of 0.25%-1%. Simultaneous retrieval of Cloud Droplet Number Concentration (CDNC) during primary organic aerosol plumes reveals CDNC concentrations of 350 cm-3 for organic mass concentrations 3-4 mg m-3. It is demonstrated that the retrieved high CDNCs under clean marine conditions can only be explained by organic sea-spray and corroborates the high CCN activation efficiency associated with primary organics. It is postulated that marine hydrogels are responsible for this dichotomous behavior.

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