【摘要】 1 994～ 1 995年的冬季和夏季 ,在北京大学共观测了 1 1次不同类型的雨、雪过程 ,对每次降水过程进行连续取样和过滤 ,用电子显微镜分析全部 2 8个降水过滤样品 ,测定不可溶成分中 1 5种元素 (Si、Fe、Al、K、Ca、Cu、Ti、Mg、Na、P、S、Cl、Ni、Mn、Cr)的重量百分比分布。通过平均值计算、聚类法分析和元素间的相关分析 ,讨论了降水中不可溶成分的物质组成和来源。更多还原

【Abstract】 During the seasons of winter and summer in 1994-1995 eleven processes of rain and snow belong to different types were observed in Peking University. Precipitation samples were continuously collected and filtered for each rain or snow process. Weight-percentage distributions of 15 elements ( Si,Fe,Al,K,Ca,Cu,Ti, Mg,Na,P,S,Cl,Ni,Mn, and Cr ) in insoluble components were measured by electron microscope for 28 filtered samples of all precipitation processes. Using averaging method, cluster analysis and correlation analysis of elements, material composition and sources for insoluble components in precipitation were discussed.更多还原