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Abstract

It has been postulated that the emission of dimethylsulfide (DMS) may have a significant influence on the Earth's radiation budget and possible a role in climate change.
The products of the has phase reactions of DMS and dimethylsulfone (DMSO) with the OH radical have been investigated. For the reaction between DMS and OH the sulfur containing products SO(2), DMSO(2), methylsulfonylperoxynitrate (MSPN), DMSO, methanesulfonic acid (MSA), H(2)SO(4) and methanesulfinic acid (MSIA) have been observed and quantified. Methanesulfinic acid has not previously been shown to be a product of DMS and OH. From the reaction between DMSO and OH the sulfur containing products SO(2), DMSO(2) and MSPN have been identified and quantified.
The kinetic part of the study has been a determination of rate constants for the oxidation of DMSO and DMSO(2) with OH, NO(3), and O(3) in order to estimate their atmospheric lifetimes.
The experiments have been performed in Teflon coated reaction chamber equipped with multi-reflection mirror systems for online Fourier transform infrared spectroscopy (FT-IR). The OH radicals were formed by photolysis of CH(3)ONO or H(2)O(2) and the NO(3) radicals were formed by the thermal dissociation of N(2)O(5). The possible atmospheric consequences of the kinetic and mechanistic results are discussed. d.

Additional information

Authors: FALBE-HANSEN H, JRC Ispra (IT);SØRENSEN S, JRC Ispra (IT);JENSEN N R, JRC Ispra (IT);HJORTH J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: NOSA/NORSAC Symposium 1996, Copenhagen (DK), November 15-17, 1996
Availability: Available from (1) as Paper EN 40219 ORA
Record Number: 199710008 / Last updated on: 1997-02-03
Category: PUBLICATION
Original language: en
Available languages: en
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