Total gaseous mercury emissions from soil in Guiyang, Guizhou, China
Total gaseous mercury emissions from soil in Guiyang, Guizhou, China
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DOI：
10.1029/2004jd005643
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发表时间：
2005-07
影响因子：
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通讯作者：
Xinbin Feng;Shaofeng Wang;G. Qiu;Yamin Hou;Shunlin Tang
中科院分区：
文献类型：
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作者：
Xinbin Feng;Shaofeng Wang;G. Qiu;Yamin Hou;Shunlin Tang
[1]贵阳地处环太平洋全球汞富集带，土壤汞含量较高。2003年5月21日至6月16日，在贵阳市4个采样点对大气-土壤表面气态汞(TGM)交换通量进行了现场观测。总体而言，从所有采样点获得了净排放量。土壤汞浓度和太阳辐射是控制土壤汞排放的两个最重要的参数。同时，一次降雨事件可以显著增加汞的排放速率。基于汞通量与太阳辐射之间的线性相关关系，建立了一个简单的模型，用来放大不同汞浓度范围土壤区域的汞排放。结果表明，贵阳市土壤汞排放通量比早期全球含汞带土壤汞排放通量高出一个数量级，即1.1ngm−2 h−1。计算出贵阳市土壤汞年排放量为408 kg，说明土壤自然排放对贵阳市环境空气中总有机汞浓度升高有显著贡献。
[1] Guiyang is located in the Circum-Pacific Global Mercuriferous Belt, and mercury concentrations in soil in this area are enriched. In situ total gaseous mercury (TGM) exchange fluxes between air and soil surface were intensively measured at four sampling sites in Guiyang from 21 May to 16 June 2003. Overall, net emissions were obtained from all sampling sites. Soil mercury concentration and solar radiation are proved to be the two most important parameters to control mercury emissions from soil. Meanwhile, a rain event can enhance mercury emission rate significantly. A simple model based on the linear correlation between mercury flux and solar radiation was applied to scale up mercury emissions from soil zones with different mercury concentration ranges. It is observed that mercury emission fluxes from soil in Guiyang are one order of magnitude higher than the value used in early models to represent emissions from global mercuriferous belts which is 1.1 ng m−2 h−1. The annual mercury emission from soil in Guiyang is calculated to be 408 kg, which highlights that natural emissions from soil contribute significantly to the elevated TGM concentrations in the ambient air in Guiyang.