Die u:cris Detailansicht:
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