沙尘气溶胶粒子表面变性对云滴形成过程的影响

Effects of the Heterogeneous-Phase Chemical Processes on Mineral Aerosols on the Growth of Cloud Droplets

利用1997年5月14日辽宁省气溶胶和云滴谱航测资料,讨论了沙尘气溶胶粒子表面变性产生的不溶性沙尘粒子外包可溶性硫酸铵层的混合气溶胶粒子作为凝结核的增长规律,计算了由混和核形成的云滴谱特征,并与纯硫酸铵盐核进行对比。结果表明:混和核上初期形成的云滴谱型比纯硫酸铵盐核上初期形成的云滴谱型要宽,更接近实际观测到的云滴谱分布。

On the CCN （Cloud Condensation Nuclei ） condition of mineral aerosols coated with （ NH4 ） 2 SO4 by heterogeneous-phase chemical processes, the rule of the condensation growth process of droplets is discussed first. Based on the aerosol and cloud droplet size distribution data measured in the aerial survey in Liaoning on May 14,1997, the cloud drop size distributions are calculated for mineral aerosols coated with （ NH4 ） 2 SO4 and pure （ NH4 ） 2 SO4 nuclei, respectively. Comparison shows that the cloud drop size distributions for mineral aerosol coated with （NH4 ）2SO4 are wider than the ones for pure （NH4 ）2 SO4 nuclei, and the former is in agreement better well with the observation than the latter.