A comparative study on seasonal variation of ~7Be concentrations in surface air between Mt. Waliguan and Mt. Guanfeng
A comparative study on seasonal variation of ~7Be concentrations in surface air between Mt. Waliguan and Mt. Guanfeng
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发表时间：
2006
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通讯作者：
Zhen Xiang-dong;Wang Chang-sheng
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文献类型：
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作者：
Zhen Xiang-dong;Wang Chang-sheng
7Be作为大气传输、表层土壤季节性迁移和颗粒物混合的示踪剂，已得到广泛应用。它在不同空间的浓度分布是许多科学领域研究的基础。根据不同的位置和海拔之间的山。瓦里关山关峰教授认为，地面大气中7Be浓度的对比观测将有助于区域乃至全球范围内对大气和地球表面环境过程的认识。从10月9日起，2002年至1月21日，2004年，在Mt.瓦里关山每周采集一次。中美实验室同步进行的7Be详细γ能谱计数结果表明，7Be浓度的周变化基本一致，在Mt.瓦里关山7Be年平均浓度分别为（14.7 ± 1.5）mBq/m3和（4.1 ± 0.9）mBq/m3。通过对7Be浓度与同期降雨量的对比，发现两个观测点的7Be浓度在周尺度上呈显著负相关。但在月平均尺度上，这两个站点的7Be浓度显示稳定。
7Be, as a tracer for atmosphere transmission, seasonal transfer of surface soils and for particulate mixing, has been applied widely. Its concentration distribution in different space is an investigative groundwork in many science fields. Based on the different locations and altitude between Mt. Waliguan and Mt. Guanfeng, contrast observation of 7Be concentrations in the surface air will be beneficial to understanding of environmental processes of atmosphere and the earth’s surface regionally, and as well as globally. From 9 Oct., 2002 to 21 Jan., 2004, filter samples in the surface air at Mt. Waliguan and Mt. Guanfeng, China were collected once a week. Synchronous detailed γ-energy spectrometric counting of 7Be activity by both Chinese and USA laboratories has shown that weekly variations in 7Be concentrations were in good agreement, and that short, two-six-week fluctuating periods were found at Mt. Waliguan and Mt. Guanfeng with the annual averages of 7Be concentrations to be (14.7±1.5) mBq/m3 and (4.1±0.9) mBq/m3, respectively. Based on the comparison between 7Be concentration and rainfall in the same periods, significantly inverse relationship was found at both observation sites at a weekly scale. But 7Be concentrations show stable at those two sites at a monthly mean scale.