Hygroscopic properties of smoke-generated organic aerosol particles emitted in the marine atmosphere

A. Wonaschütz, M. Coggon, A. Sorooshian, R. Modini, A. A. Frossard, L. Ahlm, J. Mülmenstädt, G. C. Roberts, L. M. Russell, S. Dey, F. J. Brechtel, J. H. Seinfeld

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Abstract

During the Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE), a plume of organic aerosol was produced by a smoke generator and emitted into the marine atmosphere from aboard the R/V Point Sur. In this study, the hygroscopic properties and the chemical composition of the plumewere studied at plume ages between 0 and 4 h in different meteorological conditions. In sunny conditions, the plume particles had very low hygroscopic growth factors (GFs): between 1.05 and 1.09 for 30 nm and between 1.02 and 1.1 for 150 nm dry size at a relative humidity (RH) of 92 %, contrasted by an average marine background GF of 1.6. New particles were produced in large quantities (several 10 000 cm.-3), which lead to substantially increased cloud condensation nuclei (CCN) concentrations at supersaturations between 0.07 and 0.88 %. Ratios of oxygen to carbon (O : C) andwater-soluble organic mass (WSOM) increased with plume age: From.

Original languageEnglish (US)
Pages (from-to)9819-9835
Number of pages17
JournalAtmospheric Chemistry and Physics
Volume13
Issue number19
DOIs
StatePublished - Oct 17 2013

ASJC Scopus subject areas

  • Atmospheric Science

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    Wonaschütz, A., Coggon, M., Sorooshian, A., Modini, R., Frossard, A. A., Ahlm, L., Mülmenstädt, J., Roberts, G. C., Russell, L. M., Dey, S., Brechtel, F. J., & Seinfeld, J. H. (2013). Hygroscopic properties of smoke-generated organic aerosol particles emitted in the marine atmosphere. Atmospheric Chemistry and Physics, 13(19), 9819-9835. https://doi.org/10.5194/acp-13-9819-2013