期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 12, 页码 4347-4353出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL060219
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资金
- U.S. Department of Energy's Atmospheric System Research, an Office of Science, Office of Biological and Environmental Research program
- Division of Chemical Sciences, Geosciences, and Biosciences) of the U. S. Department of Energy [DE-AC02-05CH11231]
- Condensed Phase and Interfacial Molecular Sciences Program
- OBER at Pacific Northwest National Laboratory
- National Science Foundation [CHE-0909227]
- [DE-AC06-76RL0]
The size and thickness of organic aerosol particles collected by impaction in five field campaigns were compared to those of laboratory-generated secondary organic aerosols (SOA). Scanning transmission X-ray microscopy was used to measure the total carbon absorbance (TCA) by individual particles as a function of their projection areas on the substrate. Particles with higher viscosity/surface tension can be identified by a steeper slope on a plot of TCA versus size because they flatten less upon impaction. The slopes of the ambient data are statistically similar indicating a small range of average viscosities/surface tensions across five field campaigns. Steeper slopes were observed for the plots corresponding to ambient particles, while smaller slopes were indicative of the laboratory-generated SOA. This comparison indicates that ambient organic particles have higher viscosities/surface tensions than those typically generated in laboratory SOA studies.
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