折射率和粒子尺度对大气气溶胶光散射特性的影响

采用Mie散射方法计算了小尺度范围内，0.65 m波长大气气溶胶粒子光学特性与折射率、粒子尺度参数的关系，并分析了折射率虚部对气溶胶粒子散射相函数的影响。结果表明:在小尺度范围内，气溶胶粒子散射特性受折射率、尺度参数影响较大，折射率实部和尺度参数对消光效率因子等非散射角散射参量的影响存在一定程度的对称性。同时还发现，在特殊散射角位置，无论对于单粒子还是对于多分散粒子群系统，气溶胶粒子（群）的散射相函数与折射率虚部基本无关，不同折射率虚部的散射相函数在前向散射方向存在交点，交点位置随粒子尺度参数的变化基本为高斯分布。随着粒子尺度参数的增大，交点位置向前向小角方向移动，并逐步趋于离散。这一结论对了解大气气溶胶粒子的散射效应具有一定的参考意义。

Effect of the refractive index and particle size parameter on light scattering properties of atmosphere aerosol

The effects of reflective index and particle size parameters on optical properties of atmosphere aerosol particles were studied by using Mie scattring method at the wavelength of 0.65 m over small scales. The influence of the imaginary part of refractive index on the aerosol particle scattering phase function was analyzed. The results show that, in the small scale, the light scattering properties are sensitive to the refractive index and size parameter. The influence of the real part of refractive index and size parameter on non-scattering angle optical parameters is a degree of symmetry. It was also found that in the special position of the scattering angle, no matter the single particle or polydisperse particles, the scattering phase function are independent of the imaginary part of refractive index, scattering phase functions of different imaginary part of refractive index have an intersection point in the forward direction, the intersection point takes Gaussian distribution with the increase of particle size parameter. With the increase of particle size parameter, the intersection point would move to the small forward direction, and gradually become discrete. This work is of reference value in studying the scattering properties of aerosols and their climatic effects.