玉龙雪山地区大气降水中粉尘颗粒物特征研究

以在玉龙雪山地区采集的大气降水样品为主要研究载体,分析了大气降水中粉尘颗粒物随时间的变化特征和影响大气降水中粉尘含量的潜在因素.结果表明:大气降水中颗粒物浓度和典型粉尘特征化学离子含量的变化具有很好的一致性,且季风期末大气降水中的微粒含量显著升高,显示了明显的季节性变化特征.丽江市和甘海子盆地大气降水中粉尘化学离子含量(SO2-4,Mg2+,Ca2+,K+,NH+4,NO-3,粉尘浓度)之间具有较好的相关性,反映了这些离子共同的来源.降水中pH值和电导率的变化很大程度上受到粉尘活动的影响,海盐气溶胶粒子对玉龙雪山地区大气降水中典型粉尘微粒(除Cl-和部分Na+之外)的沉降没有贡献.此外,降水化学和微粒分析表明,丽江市区的大气环境不排除人为活动的影响.

Characteristics of the microparticles in atmospheric precipitation around the Mt. Yulong

In this paper, the characteristics of microparticles in atmospheric precipitation and the temporal variation of insoluble dust particles in rain water are analyzed primarily on the samples collected around the Mt. Yulong. The analyses indicate that there exist distinct seasonal features of the microparticles and chemical ions in precipitation, and the concentration of microparticles increase significantly in precipitation in the post-monsoon season, reflecting distinct seasonal variations of precipitation chemistry. The representative chemical ions and dust particles (SO₄^2-, Mg²⁺, Ca²⁺, K⁺, NH₄⁺, NO₃^- and dust) in Lijiang and Ganhaizi atmospheric precipitation are well correlated, indicating that they have common sources. Variations of chemical ions and dust particles in precipitation are greatly consistent with each other. The variations of pH value and electricity conductivity (EC) are greatly depended on and influenced by the dust events which frequently occur in spring or winter. It is also revealed that marine aerosols has no contribution to the dust deposition in precipitation around the Mt. Yulong, except for Cl^- and part of Na⁺. Moreover, chemical composition and dust analyses indicate that the atmospheric environment in Lijiang is somewhat influenced by the anthropogenic activities.