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Science 2 January 1998:
Vol. 279. no. 5347, pp. 74 - 76
DOI: 10.1126/science.279.5347.74
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Reports

Formation of Molecular Chlorine from the Photolysis of Ozone and Aqueous Sea-Salt Particles

K. W. Oum, M. J. Lakin, D. O. DeHaan, * T. Brauers, dagger B. J. Finlayson-Pitts ddagger

Halogen atoms from the reactions of sea-salt particles may play a significant role in the marine boundary layer. Reactions of sodium chloride, the major component of sea-salt particles, with nitrogen oxides generate chlorine atom precursors. However, recent studies suggest there is an additional source of chlorine in the marine troposphere. This study shows that molecular chlorine is generated from the photolysis of ozone in the presence of sea-salt particles above their deliquescence point; this process may also occur in the ocean surface layer. Given the global distribution of ozone, this process may provide a global source of chlorine.

Department of Chemistry, University of California, Irvine, CA 92697-2025 USA.
*   Present address: Department of Chemistry and Biology, Lyon College, Post Office Box 2317, 2300 Highland Road, Batesville, AR 72503-2317, USA.

dagger    Present address: Institut für Atmosphärische Chemie, Forschungszentrum KFA, 52425 Jüelich, Germany.

ddagger    To whom correspondence should be addressed. E-mail: bjfinlay{at}uci.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Reactions at Interfaces As a Source of Sulfate Formation in Sea-Salt Particles.
A. Laskin, D. J. Gaspar, W. Wang, S. W. Hunt, J. P. Cowin, S. D. Colson, and B. J. Finlayson-Pitts (2003)
Science 301, 340-344
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Experiments and Simulations of Ion-Enhanced Interfacial Chemistry on Aqueous NaCl Aerosols.
E. M. Knipping, M. J. Lakin, K. L. Foster, P. Jungwirth, D. J. Tobias, R. B. Gerber, D. Dabdub, and B. J. Finlayson-Pitts (2000)
Science 288, 301-306
   Abstract »    Full Text »


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