摘要
本文主要讨论了碰并系数、雨滴谱和气溶胶谱对湿清除率的影响.在0.1μm<r<1μm范围内不同碰并系数表达式可对本区间内的气溶胶粒子的清除率有影响,对全谱范围内的大气气溶胶粒子的总清除率影响不大.雨滴谱型的不同对总清除率有很大影响,用Marshall-Palmer分布谱表示的降雨清除率与雨强的关系为∧(h^(-1))=0.69I^(0.08)(I:mm/h)而用在广东实测的雨滴谱,计算的清除关系式为∧(h^(-1))=0.32I^(0.83).本文还用雨滴谱资料计算了在广东、广西实测的大气气溶胶9种可溶性组分的清除率,结果表明:对不同的离子谱分布,其清除率系数差别不大.
This paper discusses the influences of the collision efficiency and size distributions of aerosols and precipitation particles on the wet removal coefficients First, different collision efficient expressions for aerosols ranging from 0.1 μm to μm have evident impacts on the washout rate of the aerosols in this range but have little effect on the scavenging of aerosols over the whole size range. Secondly , the raindrop size distribution affects the scavenging rate greatly. With the Marshall-Palmer distribution, the parameterization of the washout' rate is: ∧ (h-1) = 0.69I 0.80 (I: mm/h, rain rate). On the other hand, the expression turns out to be ∧ (h-1 )=0.32I 0.83 when the collected raindrop data in Guangdong Province (China) are used. Finally, the scavenging rates of nine soluble ions measured in Guangdong and Guangxi Province are calculated with the collected raindrop data . The results show that, despite large variations of the ions' mass spectra,. the parameters of the scavenging rate only change a little .
出处
《大气科学》
CSCD
北大核心
1992年第5期622-630,共9页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金
关键词
降水
气溶胶
颗粒
清除
参数
Wet removal coefficients
collision efficiency , Raindrop size distribution .
