沿海海洋边界层中氯原子、氯氧自由基和氢氧自由基的大气浓度。
Atmospheric concentrations of the Cl atom, ClO radical, and HO radical in the coastal marine boundary layer.
作者信息
Chang Chang-Tang, Liu Tsun-Hsien, Jeng Fu-Tien
机构信息
Department of Environmental Engineering, National I-Lan Institute of Technology, No. 1, Sheen-Long Road, I-Lan City 260, Taiwan.
出版信息
Environ Res. 2004 Jan;94(1):67-74. doi: 10.1016/j.envres.2003.07.008.
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.
本研究估算了沿海海洋边界层中氯原子（Cl*）、一氧化氯自由基（ClO*）和羟基自由基（HO*）的大气浓度。采用了一种稳态方法来计算它们与其他大气化学物质处于平衡状态时的浓度。1999年春季，在台湾的四个地点对大气痕量物质HCl、Cl2、HCHO、H2O2、CH3OOH、CH4、CO、SO2、NO、NO2和O3进行了测量。结果表明，Cl原子、ClO和HO自由基的浓度随云量显著降低。计算得出的Cl、ClO和HO的白天平均浓度分别为3×10⁵、1×10⁷和6×10⁵个分子/立方厘米。由于Cl与碳氢化合物的高反应活性及其浓度水平与HO相当，在这些情况下，Cl*应该是碳氢化合物的一个重要汇。
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