Field studies of dimethyl sulfide and its oxidation products in the atmosphere.

Hewitt, CN and Davison, B. (1997) Field studies of dimethyl sulfide and its oxidation products in the atmosphere. Philosophical Transactions B: Biological Sciences, 352 (1350). pp. 183-189. ISSN 0962-8436

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Abstract

Dimethyl sulphide (DMS) is released into ocean waters by phytoplankton and may then cross the water-air interface into the atmosphere. Various models have been formulated to describe its behaviour in the atmosphere. Here, measurements of its concentrations and those of its major oxidation products, methane sulphonate, sulphur dioxide, non sea-salt sulphate and demethyl sulphoxide, in both the gas and aerosol phases, in Atlandtic air, are used to validate these qualitative descriptions of its oxidation. Behaviour consistent with day-time oxidation by the hydroxyl radical, with the yield of methane sulphonic acid being both temperature dependent and under the influence of the nitrogen dioxide mixing ratio, is seen. The rapid production of new particles also seems likely under certain conditions but it is not clear whether or not they enhance the concentrations of cloud condensation nuclei in the maritime troposphere. In maritime air a substantial fraction of the sulphate formed appears to be neutralized by reaction with ammonia to form ammonium aerosol.

Item Type: Journal Article
Journal or Publication Title: Philosophical Transactions B: Biological Sciences
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/ge
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21932
Deposited By: ep_ss_importer
Deposited On: 12 Feb 2009 12:31
Refereed?: No
Published?: Published
Last Modified: 10 Jun 2019 18:30
URI: https://eprints.lancs.ac.uk/id/eprint/21932

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