相对湿度对大气气溶胶粒子短波辐射特性的影响

Influence of Relative Humidity on Shortwave Radiative Properties of Atmospheric Aerosol Particles

利用Ｍｉｅ散射原理和重庆实测气溶胶资料，详细计算了边界层内单个气溶胶粒子的光学特性参量，气溶胶粒子群体的散射、吸收、消光系数及不对称因子、散射比、光学厚度；进而采用二流近似和累加法计算了边界层内太阳短波辐射增温率。目的在于研究相对湿度对以上各特性参量的影响。结果表明，相对湿度在６５％～９５％之间变化时，对气溶胶粒子群体光学特性参数和太阳增温率的影响在量级上可与气溶胶粒子浓度成倍变化的影响相比拟。

Based on Mie scattering theory and ground-based measurements of aerosoIs inChongqing;; detailed calculations are performed to study the influence of relative humidity on shortwaveradiative properties of aerosol particles. Then the heating rate in PBL is determined by means oftwo-stream approximation and the adding method. Results show that the influences of relative humidi-ty changed from 65% to 95% on the aerosol shortwave radiative properties can be compared with theinfluences of multiple change of aerosol partictes total number.