摘要
1999年 2月 2 3～ 2 6日在北京气象塔 47m高度和 3月 1 0～ 1 2日在距地面 6m高度各进行了为期 3天的气溶胶采样 ,获得 1 2组分级采样样品 ,用PIXE方法对样品进行了分析 ,得到了 2 0种元素的浓度及其谱分布 ,并对当前北京气溶胶的来源、化学元素成分的变化进行了研究。与过去相比 ,除Si、K、Ca、Ti、Sr、V元素浓度降低外 ,其他元素浓度均有不同幅度的增加。研究表明 ,当前北京地区气溶胶的来源已发生较大变化。
In 1999, aerosol samples were collected by cascade at the meteorological tower at the altitude of 47 m (February 23～28) and at the top of a two-level office building nearby at the altitude of 6 m (March 10～12) in Beijing The 12 group aerosols samples obtained were analyzed using PIXE method, which resulted in 20 elemental concentrations and elemental distribution From the observation, the elemental concentrations, elemental distribution and their changes are analyzed It has been found that concentrations of most elements of aerosols increase much compared with that in the past except that the concentrations of V, K Sr decrease It shows that the source of aerosols in Beijing has changed much in the past decade
出处
《气候与环境研究》
CSCD
2000年第1期6-12,共7页
Climatic and Environmental Research
基金
中国科学院大气物理研究所所长重点基金项目98-209
国家重点基础研究发展规划项目G1999043403
射线束技术与材料改性教育部重点实验室资助
关键词
气溶胶
化学成分
浓度
aerosol
elemental distribution
concentration
