Beryllium-7 in near-surface atmospheric aerosols in mid-latitude (40A degrees N) city Beijing, China

文献类型： 外文期刊

第一作者： Tan, Keyan

作者： Tan, Keyan;Yang, Yongliang;Zhu, Xiaohua;Chen, Shu;Jiao, Xingchun;Gai, Nan;Huang, Yi;Li, Yong;Yu, Hanqing

作者机构：

关键词： Beryllium-7;Aerosol;Beijing;East Asia monsoon;Seasonal;Variation

期刊名称：JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY （ 影响因子：1.371； 五年影响因子：1.28 ）

ISSN： 0236-5731

年卷期： 2013 年 298 卷 2 期

页码：

收录情况： SCI

摘要： A high-volume air sampler and a high-resolution gamma-ray spectrometer have been used to measure the activity of Be-7 in near-surface atmospheric aerosols at sampling frequency of 3 days week for 1 year from August 2009 to July 2010 at Beijing in the mid-latitude region of East Asia monsoon. The measurements indicate that the average concentration of Be-7 was 8.39 +/- A 0.49 mBq m(-3), which was significantly higher than values reported for other cities in the East Asia monsoon region and in the world during the same period. The maximum and minimum of the weekly means of Be-7 concentration were observed in September and May, respectively. The Be-7 concentrations varied in accordance with the monsoon phases. Low but frequent wet precipitation may have caused lower Be-7 observed in July when southeasterly was prevailing. Higher seasonal mean of Be-7 concentrations in autumn could be attributed to the abnormal atmospheric circulation in autumn 2009.

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