台风对沿海地区气溶胶光学特性的影响分析

Analysis of the Optical Characteristic of Littoral Aerosol Influenced by Typhoon

利用CE317太阳辐射计对2005年第19号台风登陆前后期间(9月29日至10月6日)进行观测实验,采用Langley法分析台风对中国大陆沿海地区气溶胶光学特性的影响。指出台风过后气溶胶光学特性明显发生改变,气溶胶大粒子数增多,小粒子数减小。气溶胶光学厚度、ngstrm波长指数α和大气混浊度系数β为测量期间最低分别为0.132(550nm处),0.861和0.079。同时利用实验期间APS3321空气动力学粒度仪分析的气溶胶单位体积数粗细质粒所占比重、气溶胶粒子尺度谱分布和实测的日际气溶胶粒子数浓度对实验分析结果α,β进行对比,发现它们之间的一致性很好。

The optical characteristic of littoral aerosol influenced by typhoon is analyzed, through measuring aerosol optical thickness with sunphotometer CE317 in a Langley method in the 19th typhoon period in 2005. Aerosol is changed obviously after typhoon, the thin particle amount decreases arid thick particle amount increases. Aerosol optical thickness, Angstrom parameter a and atmosphere turbidity parameter β reach to the lowest ralue of 0.132 （550 nm） ,0. 861 and 0. 079 respectively. The percentage of thin particle and thick particle in a unit volume amount, the size distribution of aerosol and amount concentration of aerosol particle are measured by aerodynamic particle sizer spectrometer, which agree well with the above α,β value.