Measurement report: Impact of cloud processes on secondary organic aerosols at a forested mountain site in southeastern China
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Le résumé fourni par la source
Aerosol particles play critical roles in climate and human health. However, aerosol composition and evolution, particularly secondary organic aerosol (SOA), and aerosol interactions with clouds in high-altitude background areas in China remain less understood. Here, we conducted real-time measurements of submicron aerosols (PM 1 ) using aerosol mass spectrometers at a forested mountain site (1128 m a.s.l.) in southeastern China in November 2022. The average (±1 σ ) PM 1 mass concentration was 4.3±4.8 µg m −3 , which was ubiquitously lower than that at other mountain sites in China. Organic aerosol (OA) constituted the largest fraction of PM 1 (42.9 %) and was predominantly secondary, as indicated by the high oxygen-to-carbon (O / C) ratio (0.85–0.96) and carbon oxidation state (0.21–0.49). Notably, the remarkably enhanced PM 1 concentrations observed during the daytime on cloudless days were identified to be likely to be produced from cloud evaporation. While more oxidized oxygenated OA was scavenged efficiently during cloud events, cloud evaporation was found to release a significant amount of less oxidized oxygenated OA from air masses transported from polluted regions. The distinct decrease in OA / ΔCO with the increase in O / C during the cloud evaporative period further demonstrates that OA remaining in cloud droplets is generally in a moderate oxidation state. Moreover, organic nitrates were also estimated and showed a higher contribution to the total nitrate during the cloudy period (27 %) than during the evaporative period (3 %). Overall, our results demonstrate the importance of SOA and the influences of cloud processes in regional mountain areas in southeastern China.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Measurement report: Impact of cloud processes on secondary organic aerosols at a forested mountain site in southeastern China
- Date Crossref
- 29/07/2024
- Éditeur
- Copernicus GmbH
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Chinese Academy of Sciences pays non établi dans la noticeOrganisme public
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Institute of Atmospheric Physics pays non établi dans la noticeStructure de recherche
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University of Chinese Academy of Sciences pays non établi dans la noticeUniversité ou école supérieure
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Chinese Academy of Social Sciences pays non établi dans la noticeStructure de recherche
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Jinan University Institute for Environmental and Climate Research pays non établi dans la noticeUniversité ou école supérieure
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Zhejiang Environmental Monitoring Center pays non établi dans la noticeUniversité ou école supérieure
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Aerodyne Research pays non établi dans la noticeEntreprise
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College of Earth and Planetary Sciences pays non établi dans la noticeUniversité ou école supérieure
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State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry pays non établi dans la noticeStructure de recherche
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Shanghai Environmental Monitoring Center pays non établi dans la noticeInstitution
Chinese Academy of Sciences, Institute of Atmospheric Physics et University of Chinese Academy of Sciences, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.