Evolution and chemical characteristics of organic aerosols during wintertime PM_2.5 episodes in Shanghai, China: insights gained from online measurements of organic molecular markers

Abstract 2.5), and a lack of detailed knowledge of their sources has increasingly hindered the improvement of air quality in China in recent years, as significant reductions have been achieved in inorganic ion constituents. In this study, a wide range of organic molecular markers in PM2.5 were monitored with a bi-hourly time resolution using a thermal desorption aerosol gas chromatograph system (TAG) in urban Shanghai in winter 2019. The molecular marker data have provided a unique source tracking ability in characterizing the evolution of organic aerosols during nine wintertime episodic events. Episodes primarily influenced by local air masses were characterized with higher proportions in PM2.5 and mass increments of both primary and secondary OA. Rapid increases in both the absolute mass concentration and relative proportion were observed for primary and secondary OA markers, indicative of vehicle emissions (e.g., alkanes, hopanes, and 2,3-dihydroxy-4-oxopentanoic acid) and cooking activities (e.g., saturated and unsaturated fatty acids and C9 acids). In comparison, episodes under significant influences of transported air mass were typically associated with a predominant PM2.5 contribution from secondary inorganic aerosols and enhanced OA contribution from biomass burning activities. The latter was evident from the tracer data (e.g., levoglucosan, aromatic polycarboxylic acids, and nitroaromatic compounds). Secondary OA markers associated with later-generation products of the hydrocarbon oxidation process, such as C3 - 5 2.5 episodes under synoptic conditions conducive for regional transport.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Evolution and chemical characteristics of organic aerosols during wintertime PM_2.5 episodes in Shanghai, China: insights gained from online measurements of organic molecular markers ; volume:23 ; number:13 ; year:2023 ; pages:7551-7568 ; extent:18 ; Atmospheric chemistry and physics ; 23, Heft 13 (2023), 7551-7568 (gesamt 18)

Beteiligte, Orts- und Zeitangaben

• Urheber: Zhu, Shuhui ; Zhou, Min ; Qiao, Liping ; Huang, Dan Dan ; Wang, Qiongqiong ; Wang, Shan ; Gao, Yaqin ; Jing, Shengao ; Wang, Qian ; Wang, Hongli ; Chen, Changhong ; Huang, Cheng ; Yu, Jian Zhen

Weitere Informationen

• DOI: 10.5194/acp-23-7551-2023
• URN: urn:nbn:de:101:1-2023071304175004995894
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 14.08.2025, 10:57 MESZ