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

Autor(en)
Anna 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
Abstrakt

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 plume were

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) and water-soluble organic

mass (WSOM) increased with plume age: from < 0.001 to 0.2, and from

2.42 to 4.96 μg m−3, respectively, while organic mass fractions

decreased slightly (~ 0.97 to ~ 0.94).

High-resolution aerosol mass spectrometer (AMS) spectra show that the

organic fragment m/z 43 was dominated by C2H3O+ in the small,

new particle mode and by C3H7+ in the large particle mode. In

the marine background aerosol, GFs for 150 nm particles at 40% RH were

found to be enhanced at higher organic mass fractions: an average GF of 1.06

was observed for aerosols with an organic mass fraction of 0.53, and a GF of

1.04 for an organic mass fraction of 0.35.

Organisation(en)
Aerosolphysik und Umweltphysik
Externe Organisation(en)
California Institute of Technology (Caltech), University of Arizona, University of California, San Diego, Centre National De La Recherche Scientifique (CNRS), Brechtel Manufacturing Inc.
Journal
Atmospheric Chemistry and Physics
Band
13
Seiten
9819-9835
Anzahl der Seiten
17
ISSN
1680-7316
DOI
https://doi.org/10.5194/acp-13-9819-2013
Publikationsdatum
2013
Peer-reviewed
Ja
ÖFOS 2012
1030 Physik, Astronomie, 105204 Klimatologie, 105206 Meteorologie, 105904 Umweltforschung
Schlagwörter
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/cab0fbe5-bf05-487f-878e-2649bbb7d6ac