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Isotopic fractionation of carbonyl sulfide in the atmosphere: Implications for the source of background stratospheric sulfate aerosol

Leung, Fok-Yan T. and Colussi, Agustín J. and Hoffmann, Michael R. and Toon, Geoffrey C. (2002) Isotopic fractionation of carbonyl sulfide in the atmosphere: Implications for the source of background stratospheric sulfate aerosol. Geophysical Research Letters, 29 (10). Art. No. 1474. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20150623-154757110

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Abstract

In order to assess the contribution of carbonyl sulfide to stratospheric sulfate aerosol (SSA), we examined the stratospheric OC^(34)S and OC^(32)S concentration profiles in the infrared limb-transmittance spectra acquired by the JPL MkIV instrument. We found that OC^(34)S is preferentially depleted by solar photolysis. The derived ^(34)S enrichment factor: ε = +73.8 ± 8.6‰, in conjunction with literature values of δ^(34)S ∼ +11‰ for tropospheric OCS, and a ∼ 10% net processing of the OCS transported upwardly into the stratosphere, suggests that aerosol sulfate proceeding from OCS should be highly enriched in δ^(34)S ∼ 80‰, comparing our prediction with previous reports of δ^(34)S ∼ +2.6‰ for background SSA, we infer either that OCS is a minor contributor to SSA or that current views about its ^(34)S-abundance and atmospheric circulation are seriously flawed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2001GL013955DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2001GL013955/abstractPublisherArticle
ORCID:
AuthorORCID
Colussi, Agustín J.0000-0002-3400-4101
Hoffmann, Michael R.0000-0001-6495-1946
Toon, Geoffrey C.0000-0003-4174-7541
Additional Information:© 2002 American Geophysical Union. Received 21 August 2001; revised 26 September 2001; accepted 27 September 2001; published 30 May 2002. Thanks to Prof. Yuk Yung (Caltech) for invaluable advice and for allowing us to use his group's facilities, and to Alain Barbe for providing the spectroscopic information on O_3 isotopomers necessary for the spectral analysis.
Issue or Number:10
Record Number:CaltechAUTHORS:20150623-154757110
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150623-154757110
Official Citation:Leung, F. T., A. J. Colussi, M. R. Hoffmann, and G. C. Toon, Isotopic fractionation of carbonyl sulfide in the atmosphere: Implications for the source of background stratospheric sulfate aerosol, Geophys. Res. Lett., 29(10), doi:10.1029/2001GL013955, 2002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58481
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Jul 2015 20:45
Last Modified:09 Mar 2020 13:19

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