北京一次浮尘事件的沙尘化学特征 |
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作者姓名: | 周家茂 张仁健 石磊 刘阳 |
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作者单位: | 1.中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安 710075; ;2.中国科学院大气物理研究所,北京 100029; ;3.中国科学院研究生院 ; |
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摘 要: | 本文以2000年4月北京一次浮尘天气完整的观测资料为例,进行元素化学分析。本次浮尘期间20种元素总质量浓度为181.49μg/m3,小于同一监测分析方法下沙尘暴期的总元素质量浓度,浮尘过后与1999年3月非沙尘期的元素总浓度相近。浮尘后Al, Fe, K, Ca, Si, Ti, Mn元素浓度谱分布图形状发生改变,可能暗示着新一轮的大气污染物积累。本次浮尘事件中粗细粒子中外来源的贡献量各不相同,分别为82.8%和34.5%。
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关 键 词: | 浮尘 元素浓度 谱分布 外来源 |
Chemical characterization of dust in a floating dust event over Beijing |
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Authors: | ZHOU Jia-Mao ZHANG Ren-Jian SHI Lei LIU Yang |
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Institution: | 1.Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China ;2.Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029, China ;3.Chinese Academy of Sciences, Beijing 100049, China ; |
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Abstract: | The chemical characteristics of a floating dust event in April 2000 over Beijing were analyzed based on observation data. The total mass concentration of 20 elements in floating dust period was 181.49 μg/m3, which is much smaller than that in dust storm with the same measurement and analysis method, bigger than that in non-dust period in Mar 1999. The size distributions of Al, Fe, K, Ca, Si, Ti, Mn were changed after the passage of floating dust, which may imply a new accumulation of atmospheric particles. The contributions of remote sources to coarse and fine particles in this case were 82.8% and 34.5%, respectively. |
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Keywords: | Floating dust elemental concentration size distribution remote sources |
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