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Significant Seasonal Variations in Isotopic Composition of Atmospheric Total Gaseous Mercury at Forest Sites in China Caused by Vegetation and Mercury Sources
Xuewu Fu; Hui ZhangChen; LiuHui Zhang; Che-Jen Lin; Xinbin Feng
2019
发表期刊Environmental Science & Technology
卷号53期号:23页码:13748-13756
摘要

: In this study, isotopic compositions of atmospheric total gaseous mercury (TGM) were measured in the Mt. Changbai (MCB) temperate deciduous forest and the Mt. Ailao (MAL) subtropical evergreen forest over a 1- year period. Higher δ202HgTGM values were observed under the forest canopy than above the forest canopy in the MCB forest. The vertical gradients in δ202HgTGM and Δ199HgTGM are positively correlated with the satellite-based normalized difference vegetation index (NDVI, representing the vegetation photosynthetic activity), suggesting that a strong vegetation activity (high NDVI) induces both mass-dependent and mass-independent fractionation of TGM isotopes. The observed δ202HgTGM and Δ199HgTGM showed seasonal variations. Mean δ202HgTGM and Δ199HgTGM in summer were 0.35−0.99‰ and 0.06−0.09‰ higher than those in other seasons in the MCB forest. In contrast, the highest seasonal δ202HgTGM in the MAL forest was observed in winter at 0.07−0.40‰ higher than the values found in other seasons. The variability of δ202HgTGM and Δ199HgTGM in MCB was attributed to vegetation activities, whereas the seasonal δ202HgTGM in the MAL forest was driven by the exposure of air masses to anthropogenic emissions. Using the data in this study and in the literature, we concluded that vegetation activity and anthropogenic Hg release are the main drivers for the spatial variations in TGM isotopic compositions in the northern hemisphere.

关键词Mass-independent Fractionation Elemental Mercury Mt. Changbai Hg Isotopes Exchange Air Precipitation Deposition Emissions Transport
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10145
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Advances in Water and Air Quality, Lamar University, Beaumont, Texas 77710-0024, United States
推荐引用方式
GB/T 7714
Xuewu Fu,Hui ZhangChen,LiuHui Zhang,et al. Significant Seasonal Variations in Isotopic Composition of Atmospheric Total Gaseous Mercury at Forest Sites in China Caused by Vegetation and Mercury Sources[J]. Environmental Science & Technology,2019,53(23):13748-13756.
APA Xuewu Fu,Hui ZhangChen,LiuHui Zhang,Che-Jen Lin,&Xinbin Feng.(2019).Significant Seasonal Variations in Isotopic Composition of Atmospheric Total Gaseous Mercury at Forest Sites in China Caused by Vegetation and Mercury Sources.Environmental Science & Technology,53(23),13748-13756.
MLA Xuewu Fu,et al."Significant Seasonal Variations in Isotopic Composition of Atmospheric Total Gaseous Mercury at Forest Sites in China Caused by Vegetation and Mercury Sources".Environmental Science & Technology 53.23(2019):13748-13756.
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