北京市污染气溶胶散射特征实验及其数值模拟

Experiment and Numeric Simulation for the Scattering Characteristics of Pollute Aerosol in Beijing City

用地基遥感方法对北京市主要大气污染类型的气溶胶散射进行多角度观测实验 ,对比分析不同污染类型 ,及在不同观测角度下污染气溶胶的散射特征 ;并建立对各类型污染气溶胶散射率进行了数值模拟的数学模型。在此基础上求出观测时污染气溶胶的混浊度。为污染气溶胶的卫星遥感打下基础。

Using ground based remote sensing, multiple angle observational experiment for the scattering of synthetic aerosol of the main types of air pollution in Beijing was carried out. The scattering characteristics of synthetic aerosol in different air pollution types, and under different observational angle, are compared and analyzed, and then draw to the conclusions that:(1) the composition of synthetic aerosol can be reflected by its scattering coefficient curve. To the pollution type whose synthetic aerosol is mainly composed of coal smoke and soluble particles, the curvature of scattering coefficient curve changing with wavelength are obviously larger than that of the pollution type whose synthetic is mainly composed of sand and dust. The amount of synthetic aerosol is reflected by the value of scattering coefficient. (2) Synthetic aerosol on slightly polluted urban area are mainly composed of coal smoke and soluble particles, and in the composition of the synthetic aerosol on the area near large plants or on traffic line, both of coal smoke and dust are very high. (3)When zenith angles of sunlit and observation are larger than 40°, the change of observation angle only have slight influence to the result of observation. The change of zenith angle on the direction perpendicular to solar principle plane has far smaller influence on the result of scattering coefficient observation. Base on the result of experiment, the numeric model for simulating synthetic aerosol scattering is built, laying a base for the space-bone remote sensing of synthetic aerosol.