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Impact of temperature on the role of Criegee intermediates and peroxy radicals in dimers formation from ß-pinene ozonolysis

Gong, Yiwei 1; Jiang, Feng 1; Li, Yanxia 1; Leisner, Thomas ORCID iD icon 1; Saathoff, Harald ORCID iD icon 1
1 Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Stabilized Criegee intermediates (SCIs) and organic peroxy radicals (RO2) are critical in atmospheric oxidation processes and secondary organic aerosol (SOA) formation. However, the influence of temperature on their corresponding reaction mechanisms in SOA formation is unclear. Through utilizing formic acid as SCIs scavenger and regulating the ratio of hydroperoxyl radials (HO2) to RO2 ([HO2]/[RO2]) from ~0.3 to ~1.9 using different concentrations of CO, the roles of RO2 and SCIs in SOA formation were investigated from 248 K to 298 K, particularly for dimers formation in β-pinene ozonolysis. The SOA yield increased by 21% from 298 K to 273 K, while decreased by 40% from 273 K to 248 K. Both changing [HO2]/[RO2] and scavenging SCIs significantly affect SOA yield and composition. SCIs reactions accounted for more than 40% of dimers and SOA mass formation for all temperatures. Increasing [HO2]/[RO2] inhibited dimers and SOA formation, and this inhibition became larger with decreasing temperature. Compared to low [HO2]/[RO2] (0.30–0.34), the dimers abundance at high [HO2]/[RO2] (1.53–1.88) decreased by about 31% at 298 K and 70% at 248 K. ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
Publikationstyp Forschungsdaten
Publikationsdatum 27.11.2023
Erstellungsdatum 01.08.2022 - 24.06.2023
Identifikator DOI: 10.35097/1828
KITopen-ID: 1000164899
HGF-Programm 12.11.12 (POF IV, LK 01) Atmospheric chemistry processes
Lizenz Creative Commons Namensnennung – Weitergabe unter gleichen Bedingungen 4.0 International
Vorab online veröffentlicht am 24.07.2023
Schlagwörter Aerosol Chemistry, Secondary organi aerosols, Criegee Radicals, Peroxi Radicals
Liesmich

These data are related to the results of simulation chamber experiments conducted in the AIDA simulation chamber at KIT with secondary organic aerosol generated by oxidation of beta-pinene as described in the publication by Gong et al., in Atmosperic Chemistry and Physics in 2023 (doi.org/10.5194/egusphere-2023-1425).

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