摘要
利用2009年春季开展的“环北京云观测试验”观测的气溶胶和云凝结核(CCN)数据，研究了试验期间大气气溶胶的分布、来源特征及其与CCN的转化关系。结果表明，高浓度气溶胶基本分布在4500m以下的区域，量级可以达到103cm-3。4500m以上气溶胶呈显著下降趋势，量级仅为10cm-3；气溶胶平均直径在0.160.19μm之间。4500m以下气溶胶平均粒子谱呈双(多)峰分布，而在4500m以上基本为单峰分布。
The atmospheric aerosol distribution,source,and its relationship with cloud condensation nuclei(CCN)observed during the Beijing Cloud Experiment(BCE)are analyzed.The results show that the high number concentration of aerosol was mainly distributed below4500m,with the magnitude reaching103cm-3.Above4500m,the aerosol number concentration decreases to10cm-3with the increasing altitude,and the aerosol mean diameters were between0.16and0.19μm.Below4500m,the number size distributions of aerosol showed a bimodal(multimodal)mode,and a unimodal mode above it.
