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Published 1991 | public
Journal Article

Aerosol formation during photooxidation of organosulfur species


Measurements of aerosol formation during the photooxidation of dimethylsulfide (DMS) and dimethyldisulfide (DMDS) in an outdoor smog chamber are compared with predictions from a model of aerosol nucleation and growth in the chemically reacting system. The aerosol is assumed to consist of methanesulfonic acid (MSA), sulfuric acid, and water. Source rates of the two acid species are obtained from a detailed chemical mechanism for the organosulfur precursor oxidation and are used to drive the aerosol model. Good agreement between experiment and predictions was observed for DMDS and DMS oxidation in the presence of NOx, but maximum total number concentrations achieved during DMDS oxidation in the absence of NOx were somewhat underpredicted. The effect upon model predictions of variations in model input parameters is evaluated.

Additional Information

© 1991 Elsevier. (First received 16 January 1990 and in final form 29 May 1990). The experimental aspects of this work were supported by National Science Foundation Grant ATM-8503103. The assistance of Dr George Reischl and Dr Wolfgang Winklmayer of the University of Vienna with the smog chamber experiments is gratefully acknowledged. Computations were performed at the Lawrence Livermore National Laboratory (LLNL) under an AWU-DOE Faculty Fellowship. One of us (SMK) wishes to thank Dr Joyce Penner of LLNL for helpful discussions, and Dr John Hobson of LLNL for his assistance with the computations.

Additional details

August 22, 2023
October 17, 2023