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新疆乌鲁木齐地区冬季降水与云水酸度及其化学成分的初步观测分析
The Measurements and Analysis of pH Value and Chemical Composition of Snow and Cloudwater During Winter in Wulumuqi
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摘要: 分析了乌鲁木齐地区冬季降雪和云水的pH值与化学成分。降雪pH值平均为5.7。云水pH值为4.0左右，与采集云水同时段观测的地面降雪pH值为6.0。气团内部生成的低云云水的离子浓度比系统性降水云高约两个量级。初步分析结果表明，雪增长的微物理过程和雪粒下降过程中所捕集的大气气溶胶粒子特性可能对降雪雪水酸度有重要影响。Abstract: The measurements and analysis of pH value and chemical composition of snow and cloudwater were carried out during winters from 1982 to 1984 in Wulumuqi region of China. It shows that the mean pH value of snow is about 5.7, the pH value of cloudwater is about 4.0, with that simultaneously the observed pH value of surface snow is about 6.0. The ion concentration of liquid water in lowercloud generated within air mass is larger than that of cloud with precipitation made by synoptic systems about two orders of magnitude. A possible influence of microphysical processes of snow growth and the characteristics of aerosol particles scavenged by snow crystals on the acidity of snow is noticed
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