An oxidation flow reactor for simulating and accelerating secondary aerosol formation in aerosol liquid water and cloud droplets

Abstract ∼ µ m diameter droplets formed on monodisperse seed particles are introduced into the top of the reactor, and the relative humidity (RH) inside it is controlled to 100 %. Similar measurements made with the RH in the reactor < 2 by O3, with the observed growth of seed particles resulting from the added sulfuric acid agreeing well with estimates based on the relevant set of aqueous-phase reactions. The OH exposure (OHexp⁡) for low RH, high RH, and in-cloud conditions was determined experimentally from the loss of SO2 and benzene and simulated from the KinSim chemical kinetics solver with inputs of the measured 254 nm UV intensity profile through the reactor and loss of O3 due to photolysis. The aerosol yield for toluene at high OHexp⁡ ranged from 21.4 % at low RH with dry seed particles present in the reactor to 78.1 % with cloud droplets present. Measurement of the composition of the secondary aerosol formed from ambient air using an aerosol mass spectrometer showed that the oxygen-to-carbon ratio (O : C) of the organic component increased with increasing RH (and liquid water content).

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: An oxidation flow reactor for simulating and accelerating secondary aerosol formation in aerosol liquid water and cloud droplets ; volume:17 ; number:14 ; year:2024 ; pages:4227-4243 ; extent:17 ; Atmospheric measurement techniques ; 17, Heft 14 (2024), 4227-4243 (gesamt 17)

Contributors, Places and Time

• Creator: Xu, Ningjin ; Le, Chen ; Cocker, David R. ; Chen, Kunpeng ; Lin, Ying-Hsuan ; Collins, Don R.

Further information

• DOI: 10.5194/amt-17-4227-2024
• URN: urn:nbn:de:101:1-2408061217366.571215807854
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 14.08.2025, 10:44 AM CEST