单雾滴与雾滴气溶胶红外辐射特性参数变化规律分析

Changes Regulation Analysis on the Infrared Radiative Propertiesof Single Droplet and Aerosol

采用Mie散射理论计算分析了单个雾滴和雾滴气溶胶在0.8-20微米波段内的红外辐射特性变化规律。分析表明,单个雾滴的光学效率因子都是随着粒径增大而趋于收敛,消光因子趋于2,散射因子和吸收因子都收敛于1;消光系数随波长的变化不明显,而散射系数和吸收系数近似以1/2的消光系数为轴对称。单个雾滴的散射相函数波动性非常明显,而雾滴气溶胶的散射相函数则较为平滑。单雾滴的不对称因子随雾滴粒径增大趋于0.5,而雾滴气溶胶的不对称因子随波长的增大趋于0.5。单个雾滴的单次反照率随雾滴半径的增大趋向于定值,且接近于1;而雾滴气溶胶的单次反照率随波长的增大无明显规律。

The changes regulation on infrared radiative properties of single droplet and aerosol is calculated and analyzed. The results show that, optical efficiency factors converge along with the increase of particles sizes, of which distinction factors to 2, but scattering and absorbing factors to 1. The distinction coefficients show no significant changes along with the wavelengths increasing. A approximate symmetry relationship can be acquired between scattering and absorbing coefficients curves, with half the distinction coefficients as a symmetry axis. The scattering phase function of single droplet showssignificant fluctuant changes, as a contrary, that of the aerosol shows a flowing curve.The asymmetry factor of a single droplet converges to 0.5 along with the increasing of particle size, and that of the aerosol show same regulation, but along with the increasing of wavelengths in the region of this paper. The single scattering albedo of a single droplet converges to a constant along the increasing of the particle size, but that of the aerosol shows no significant regulations along the increasing of the wavelength.