Xia Xiang-ao, Wang Ming-xing, Wang Yue-si
State Key Laboratory of Atmospheric Boundary Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
J Environ Sci (China). 2004;16(1):40-3.
Ground-based simultaneous observations of sun direct and scattering radiation were carried out in Dunhuang for nearly 2 years. Aerosol optical depth, Angstrom wavelength exponent and size distribution were obtained from solar extinction and sky radiation. Water vapor content was obtained from sun direct radiation measurement at 940 nm. Relationship between aerosol properties and water vapor was discussed. Results showed that distinct seasonality of aerosol optical depth and Angstrom wavelength exponent was corresponding to seasonal variation of dust activity. Aerosol relative size distribution kept stable and volume concentration change was the reason resulting in variation of aerosol optical depth. Water vapor had minor effects on aerosol optical and physical properties.
在敦煌进行了近2年的地基太阳直接辐射和散射辐射同步观测。通过太阳消光和天空辐射获取了气溶胶光学厚度、Ångström波长指数和粒径分布。通过940nm处的太阳直接辐射测量获得了水汽含量。讨论了气溶胶特性与水汽之间的关系。结果表明，气溶胶光学厚度和Ångström波长指数明显的季节性与沙尘活动的季节变化相对应。气溶胶相对粒径分布保持稳定，体积浓度变化是导致气溶胶光学厚度变化的原因。水汽对气溶胶的光学和物理特性影响较小。
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