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Isotopic Composition of Gaseous Elemental Mercury in the Free Troposphere of the Pic du Midi Observatory, France
Xuewu Fu; Nicolas Marusczak; Xun Wang; François Gheusi; Jeroen E. Sonke
2016
Source PublicationEnvironmental Science & Technology
Volume50Issue:11Pages:5641-5650
Abstract

Understanding the sources and transformations of mercury (Hg) in the free troposphere is a critical aspect of global Hg research. Here we present one year of observations of atmospheric Hg speciation and gaseous elemental Hg (GEM) isotopic composition at the high-altitude Pic du Midi Observatory (2860 m above sea level) in France. Biweekly integrated GEM from February 2012 to January 2013 revealed significant variations in delta Hg-202(GEM) (-0.04 parts per thousand to 0.52 parts per thousand) but not in Delta Hg-199(GEM) (-0.17 parts per thousand to -0.27 parts per thousand) or Delta Hg-200(GEM) (-0.10 parts per thousand to 0.05 parts per thousand). delta Hg-202(GEM) was negatively correlated with CO and reflected air mass origins from Europe (high CO, low delta Hg-202(GEM)) and from the Atlantic Ocean (low CO, high delta Hg-202(GEM)). We suggest that the delta Hg-202(GEM) variations represent mixing of recent low delta Hg-202(GEM) European anthropogenic emissions with high delta Hg-202(GEM) northern hemispheric background GEM. In addition, Atlantic Ocean free troposphere air masses showed a positive correlation between delta Hg-202(GEM) and gaseous oxidized Hg (GOM) concentrations, indicative of mass-dependent Hg isotope fractionation during GEM oxidation. On the basis of atmospheric delta Hg-202(GEM) and speciated Hg observations, we suggest that the oceanic free troposphere is a reservoir within which GEM is readily oxidized to GOM.

Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6214
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Xuewu Fu,Nicolas Marusczak,Xun Wang,et al. Isotopic Composition of Gaseous Elemental Mercury in the Free Troposphere of the Pic du Midi Observatory, France[J]. Environmental Science & Technology,2016,50(11):5641-5650.
APA Xuewu Fu,Nicolas Marusczak,Xun Wang,François Gheusi,&Jeroen E. Sonke.(2016).Isotopic Composition of Gaseous Elemental Mercury in the Free Troposphere of the Pic du Midi Observatory, France.Environmental Science & Technology,50(11),5641-5650.
MLA Xuewu Fu,et al."Isotopic Composition of Gaseous Elemental Mercury in the Free Troposphere of the Pic du Midi Observatory, France".Environmental Science & Technology 50.11(2016):5641-5650.
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