Intercomparison of dimethylsulfide oxidation mechanism for the marine boundary layer: Gaseous and particulate sulfur constituents
2007 (English)In: Journal of Geophysical Research-Atmospheres, ISSN 0148-0227, Vol. 112, no D15, D15304- p.Article in journal (Refereed) Published
An intercomparison of seven dimethylsulfide oxidation chemical mechanisms for the marine boundary layer (MBL) is conducted using a coupled gas phase/aerosol box model.
The mechanisms are from Koga and Tanaka (1993), Hertel et al. (1994), Saltelli and Hjorth (1995), Chin et al. (1996), Capaldo and Pandis (1997), Lucas and Prinn (2002), and the mechanism developed during the Evaluation of the Climatic Impact of Dimethyl Sulfide project (EL CID, 2003). They range from schemes with very detailed description
of the dimethylsulfide oxidation with up to 65 reactions to a very simple scheme with only six reactions suitable for global modeling. Coupling each oxidation mechanism to a monodisperse aerosol dynamics model allows for the simultaneous comparison of predicted gas phase and particulate concentrations of sulfur-containing constituents, together with the predicted contribution of dimethylsulfide (DMS) to aerosol formation
and growth. Significant differences for sulfur-containing compounds between the compared schemes are observed. The temperature dependence and magnitude of the ratio between methane sulfonate and non-sea-salt sulfate is investigated for each scheme and compared to observations. Liquid phase oxidation processes are missing in the model
and the capability of individual schemes to correctly predict observed ratios can only be assessed in part. No new particle formation was found when applying binary nucleation in the three marine boundary layer scenarios. Therefore the results suggest that several uncertainties limiting our understanding of atmospheric oxidation of dimethylsulfide with implications for climate still exist.
Place, publisher, year, edition, pages
2007. Vol. 112, no D15, D15304- p.
Atmospheric chemistry, gas phase sulfur compound, aerosol-particles, DMS, Arctic
Meteorology and Atmospheric Sciences
IdentifiersURN: urn:nbn:se:su:diva-20506DOI: doi:10.1029/2006JD007914ISI: 000248872600003OAI: oai:DiVA.org:su-20506DiVA: diva2:187032