Evidence of inorganic chlorine gases other than hydrogen chloride in marine surface air

Details Evidence of inorganic chlorine gases other than hydrogen chloride in marine surface air Evidence of inorganic chlorine gases other than hydrogen chloride in marine surface air

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..699p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 8, p. 699-702.

Physics

97

Aerosols, Air Water Interactions, Atmospheric Chemistry, Atmospheric Composition, Photochemical Reactions, Atmospheric Boundary Layer, Chlorine Compounds, Marine Environments, Mathematical Models

Scientific paper

We report the first measurements of inorganic chlorine gases in the marine atmosphere using a new tandem mist chamber method. Surface air was sampled during four days, including one diel cycle in January, 1992, at Virginia Key, Florida. Concentrations of HCl* (including HCl, ClNO3, ClNO2, and NOCl) were in the range 40 to 268 pptv and concentrations of Cl2* (including Cl2 and any HOCl not trapped in the acidic mist chamber) were in the range from 26 to 254 pptv Cl. Concentrations of Cl2* increased during the night, and decreased after sunrise as HCl* concentrations increased by similar amounts. The measurements suggest an unknown source of either HOCl or Cl2 to the marine atmosphere. Photochemical model calculations indicate that photolysis of the observed Cl2* would yield a Cl* atom concentration of order 10 exp 4-10 exp 5/cu cm. Oxidation by Cl* would then represent a significant sink for alkanes and dimethylsulfide in the marine boundary layer. The cycling of Cl* could provide either a source or a sink for O3, depending on NO(x) levels.

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