Journal
ATMOSPHERIC ENVIRONMENT
Volume 176, Issue -, Pages 103-109Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2017.11.035
Keywords
Cooking aerosol; Hygroscopicity; CCN; Chemical aging; Particle shape
Funding
- Chinese National Natural Science Foundation [41275152]
- US National Science Foundation [1455244]
- Jiangsu Government Scholarship for Overseas Studies
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1455244] Funding Source: National Science Foundation
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Cooking organic aerosol (COA) is potentially a significant fraction of organic particulate matter in urban areas. COA chemical aging experiments, using aerosol produced by grilling hamburgers, took place in a smog chamber in the presence of UV light or excess ozone. The water solubility distributions, cloud condensation nuclei (CCN) activity, and corresponding hygroscopicity of fresh and aged COA were measured. The average mobility equivalent activation diameter of the fresh particles at 0.4% supersaturation ranged from 87 to 126 nm and decreased for aged particles, ranging from 65 to 88 nm. Most of the fresh COA had water solubility less than 0.1 g L-1, even though the corresponding particles were quite CCN active. After aging, the COA fraction with water solubility greater than 0.1 g L-1 increased more than 2 times. Using the extended Kohler theory for multiple partially soluble components in order to predict the measured activation diameters, the COA solubility distribution alone could not explain the CCN activity. Surface tensions less than 30 dyn cm(-1) were required to explain the measured activation diameters. In addition, COA particles appear to not be spherical, which can introduce uncertainties into the corresponding calculations.
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