DMS and SO2 at Baring Head, New Zealand: Implications for the yield of SO2 from DMS

Atmospheric dimethyl sulfide (DMS) and sulfur dioxide (SO^sub 2^) concentrations were measured at Baring Head, New Zealandduring February and March 2000. Anti-correlated DMS and SO^sub 2^ diurnalcycles, consistent with the photochemical production of SO^sub 2^ from DMS, were observed in clean southe...

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Bibliographic Details
Published in:Journal of atmospheric chemistry 2002-02, Vol.41 (2), p.189-209
Main Authors: DE BRUYN, Warren J, HARVEY, Mike, CAINEY, Jill M, SALTZMAN, Eric S
Format: Article
Language:English
Subjects:
Chemical composition and interactions. Ionic interactions and processes
Earth, ocean, space
Exact sciences and technology
External geophysics
Meteorology
Oxidation
Photochemicals
Sulfur
Sulfur dioxide
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Summary:Atmospheric dimethyl sulfide (DMS) and sulfur dioxide (SO^sub 2^) concentrations were measured at Baring Head, New Zealandduring February and March 2000. Anti-correlated DMS and SO^sub 2^ diurnalcycles, consistent with the photochemical production of SO^sub 2^ from DMS, were observed in clean southerly air off the ocean. The data is used to infer a yield of SO^sub 2^ from DMS oxidation. The estimated yields are highly dependent on assumptions about the DMS oxidation rate. Fitting the measured data in a photochemical box model using model-generated OH levels and the Hynes et al. (1986) DMS + OH rate constant suggests that theSO^sub 2^ yield is 50-100%, similar to current estimates for the tropical Pacific.However, the observed amplitude of the DMS diurnal cycle suggests that the oxidation rate is higher than that used by the model, and therefore, that theSO^sub 2^ yield is lower in the range of 20-40%.[PUBLICATION ABSTRACT]
ISSN:0167-7764
1573-0662
DOI:10.1023/A:1014252106572