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Effects of chemical composition and mixing state on size-resolved hygroscopicity and cloud condensation nuclei activity of submicron aerosols at a suburban site in northern Japan in summer

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/68798

Title: Effects of chemical composition and mixing state on size-resolved hygroscopicity and cloud condensation nuclei activity of submicron aerosols at a suburban site in northern Japan in summer
Authors: Müller, Astrid Browse this author
Miyazaki, Yuzo Browse this author →KAKEN DB
Aggarwal, Shankar G. Browse this author
Kitamori, Yasuyuki Browse this author
Boreddy, Suresh K. R. Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Issue Date: 16-Sep-2017
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research. Atmospheres
Volume: 122
Issue: 17
Start Page: 9301
End Page: 9318
Publisher DOI: 10.1002/2017JD027286
Abstract: Ambient hygroscopic properties, numbers of size-segregated cloud condensation nuclei (CCN) at different supersaturations (0.1%-0.8%), and the chemical composition of submicron particles were simultaneously measured at a suburban site in northern Japan in summer. Two distinct periods with different growth factors (GF), CCN activation diameters, and chemical compositions were observed. The data suggest that internally mixed sulfate aerosols dominated the accumulation size mode in relatively aged aerosols during the first period, whereas particles observed during the latter periods showed external mixing dominated by organics, which was linked to low hygroscopicity and CCN activity. In particular, the higher loading of water-soluble organic matter (WSOM; similar to 60% of OM by mass) with increased WSOM/sulfate ratios corresponded to a low hygroscopicity parameter derived from the CCN measurement (kappa(CCN) = 0.15 +/- 0.02) at a dry diameter (D-dry) of 146 nm. The results suggest that WSOM, likely dominated by the influence of biogenic sources, contributed to reducing the hygroscopicity and CCN activation at this particle size. Temporal variations in the number concentrations for low GF mode at D-dry = 49.6 nm were similar to those in the elemental carbon (EC) concentration, suggesting that EC contributed to reducing hygroscopicity at this smaller size. Our results suggest that chemical composition and mixing state are important factors controlling the hygroscopicity and CCN activation of submicron particles. These results provide useful data sets of size-resolved subsaturated and supersaturated hygroscopicity and highlight the importance of the abundance of OM relative to sulfate in predicting the effects on climate change.
Rights: Copyright 2017 American Geophysical Union.
Type: article
URI: http://hdl.handle.net/2115/68798
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 宮崎 雄三

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