【摘要】 讨论了雨滴在云下对气溶胶粒子的清除，考虑了气溶胶粒子和雨滴之间的碰并系数，雨滴谱以及气溶胶粒子谱对清除系数的影响。在０１＜ ｒ＜ １０ μｍ 范围内，利用不同的碰并系数表达式算得的降雨对该区间内气溶胶粒子的清除系数相差很大，但对总质量清除系数影响不大；雨滴谱的改变对总质量清除系数有很大影响；不同的气溶胶粒子谱对总质量清除也有一定影响。雨滴谱用Ｍａｒｓｈａｌｌ－ Ｐａｌｍ ｅｒ 分布；气溶胶粒子谱用Ｊｕｎｇｅ 分布ｎ（ｒ）＝ ａｒｂ 算得清除系数与雨强关系为Λ＝ ０５１Ｉ０７８，而气溶胶粒子谱改用三参数分布（ｒ）＝ ａｒｂｅ－ ｃｒ得到清除系数与雨强的关系为Λ＝ ０２５Ｉ０７７。更多还原

【Abstract】 A study for aerosol scavenging below clouds by raindrops is undertaken The influences of the collision efficiency and size distributions of aerosols and raindrops on the wet scavenging coefficients are discussed The different collision efficient expressions for aerosols ranging from 0 1μm to 1 0 μm have evident impacts on the scavenging coefficient of the aerosols in this range, but have little effect on the scavenging of aerosols over the whole size range The raindrop size distribution affects the scavenging coefficient greatly The aerosol size distribution affects the scavenging as well With the Marshall-Palmer distribution for raindrops, the aerosol size distribution n(r)=ar b and n(r)=ar b e -cr , the parameterization of the scavenging coefficient is Λ=0 51I 0 78 and Λ=0 25I 0 77 , respectively更多还原