Unexpectedly high concentrations of molecular chlorine in coastal air

C. W. Spicer (), E. G. Chapman, B. J. Finlayson-Pitts, R. A. Plastridge, J. M. Hubbe, J. D. Fast and C. M. Berkowitz
Additional contact information
C. W. Spicer: Battelle
E. G. Chapman: Pacific Northwest National Laboratory
B. J. Finlayson-Pitts: University of California
R. A. Plastridge: Battelle
J. M. Hubbe: Pacific Northwest National Laboratory
J. D. Fast: Pacific Northwest National Laboratory
C. M. Berkowitz: Pacific Northwest National Laboratory

Nature, 1998, vol. 394, issue 6691, 353-356

Abstract: Abstract The fate of many atmospheric trace species, including pollutants such as nitrogen oxides and some volatile organic compounds, is controlled by oxidation reactions. In the daytime troposphere, these reactions are dominated by photochemically produced OH radicals; at night and in polluted environments, NO3 radicals are an important oxidant1. Ozone can contribute to the oxidation of atmospheric species during both day and night1. In recent years, laboratory investigations2,3,4, modelling studies5,6,7, measured Cl deficits in marine aerosols8 and species-nonspecific observations9,10,11 of gaseous inorganic chlorine compounds other than HCl have suggested that reactive halogen species may contribute significantly to—or even locally dominate—the oxidative capacity of the lower marine troposphere. Here we report night-time observations of molecular chlorine concentrations at a North American coastal site during onshore wind flow conditions that cannot be explained using known chlorine chemistry. The measured Cl2 mixing ratios range from

Date: 1998
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DOI: 10.1038/28584

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