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Impact of in-cloud aqueous processes on the chemical compositions and morphology of individual atmospheric aerosols

Fu, Yuzhen; Lin, Qinhao; Zhang, Guohua; Yang, Yuxiang; Yang, Yiping; Lian, Xiufeng; Peng, Long; Jiang, Feng; Bi, Xinhui; Li, Lei; Wang, Yuanyuan; Chen, Duohong; Ou, Jie; Wang, Xinming; Peng, Ping'an; Zhu, Jianxi; Sheng, Guoying

Abstract:
The composition, morphology, and mixing structure of individual cloud residues (RES) and interstitial particles (INT) at a mountaintop site were investigated. Eight types of particles were identified, including sulfate-rich (S-rich), S-organic matter (OM), aged soot, aged mineral dust, aged fly ash, aged metal, refractory, and aged refractory mixture. A shift of dominant particle types from S-rich (29 %) and aged soot (27 %) in the INT to aged refractory mixture (23 %) and S-OM (22 %) in the RES is observed. In particular, particles with organic shells are enriched in the RES (27 %) relative to the INT (12 %). Our results highlight that the formation of more oxidized organic matter in the cloud contributes to the existence of organic shells after cloud processing. The fractal dimension (D$_{f}$), a morphologic parameter to represent the branching degree of particles, for soot particles in the RES (1.82 ± 0.12) is lower than that in the INT (2.11 ± 0.09), which indicates that in-cloud processes may result in less compact soot. This research emphasizes the role of in-cloud processes in the chemistry and microphysical properties of individual particles. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129147
Veröffentlicht am 29.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000129147
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 20
Heft 22
Seiten 14063–14075
Vorab online veröffentlicht am 20.11.2020
Nachgewiesen in Scopus
Web of Science
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