title: Atmospheric concentrations of the Cl atom, ClO radical, and HO radical in the coastal marine boundary layer.
abstract: Atmospheric concentrations of chlorine atom (Cl*), chlorine monoxide radical (ClO*), and hydroxyl radical (HO*) in the coastal marine boundary layer are estimated in this study. A steady-state approach to their concentrations in equilibrium with other atmospheric chemical species is used. Measurements of atmospheric trace species, HCl, Cl2, HCHO, H2O2, CH3OOH, CH4, CO, SO2, NO, NO2, and O3, were performed at four sites in Taiwan during the spring of 1999. The results indicate that the concentrations of the Cl* atom and the ClO* and HO* radicals decrease significantly with cloud cover. The calculated average daytime concentrations of Cl*, ClO*, and HO* are 3 x 10(5), 1 x 10(7), and 6 x 10(5) molecules/cm3, respectively. Due to the high reactivity of Cl* with hydrocarbons and its concentration level competitive to that of HO*, Cl* should be a significant sink for hydrocarbons in these cases.
authors.affiliation: Department of Environmental Engineering, National I-Lan Institute of Technology, No. 1, Sheen-Long Road, I-Lan City 260, Taiwan. ctchang@ilantech.edu.tw
authors.forename: Chang-Tang
authors.initials: CT
authors.lastname: Chang
authors.forename: Tsun-Hsien
authors.initials: TH
authors.lastname: Liu
authors.forename: Fu-Tien
authors.initials: FT
authors.lastname: Jeng
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002713:Chlorine / Q000032:analysis*; D017606:Chlorine Compounds / Q000032:analysis*; D004781:Environmental Exposure / Q000032:analysis*; D004784:Environmental Monitoring; D006801:Humans; D017665:Hydroxyl Radical / Q000032:analysis*; D012621:Seasons; D012623:Seawater; D013624:Taiwan
chemical_list: D000393:Air Pollutants; D017606:Chlorine Compounds; C042133:chlorosyl; D017665:Hydroxyl Radical; D002713:Chlorine