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Article Dans Une Revue Environmental Science and Technology Année : 2020

Seasonal Variation of Mercury and Its Isotopes in Atmospheric Particles at the Coastal Zhongshan Station, Eastern Antarctica

Chuanjin Li
Jiubin Chen
Wang Zheng
Guitao Shi
  • Fonction : Auteur
Minghu Ding
  • Fonction : Auteur
Zhiheng Du
  • Fonction : Auteur
Qianggong Zhang
Xiangyu Ma
  • Fonction : Auteur
Shichang Kang
Cunde Xiao
  • Fonction : Auteur
Jiawen Ren
  • Fonction : Auteur
Dahe Qin
  • Fonction : Auteur

Résumé

Mercury (Hg) is a globally spread trace metal due to its long atmospheric residence time. Yet, our understanding of atmospheric processes (e.g., redox reactions and deposition) driving Hg cycling is still limited, especially in polar regions. The Antarctic continent, by virtue of its remoteness, is the perfect location to investigate Hg atmospheric processes in the absence of significant local anthropogenic impact. Here, we present the first 2 year record (2016-2017) of total suspended particulate mercury (PHg) concentrations along with a year-round determination of an Hg stable isotopic composition in particles collected at Zhongshan Station (ZSS), eastern Antarctic coast. The mean PHg concentration is 21.8 ± 32.1 pg/m 3 , ranging from 0.9 to 195.6 pg/ m 3 , and peaks in spring and summer. The negative mass-independent fractionation of odd Hg isotopes (odd-MIF, average-0.38 ± 0.12‰ for Δ 199 Hg) and the slope of Δ 199 Hg/Δ 201 Hg with 0.91 ± 0.12 suggest that the springtime isotope variation of PHg is likely caused by in situ photo-oxidation and reduction reactions. On the other hand, the increase of PHg concentrations and the observed odd-MIF values in summer are attributed to the transport by katabatic winds of divalent species derived from the oxidation of elemental Hg in the inland Antarctic Plateau.
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Dates et versions

hal-04382834 , version 1 (09-01-2024)

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Chuanjin Li, Jiubin Chen, Hélène Angot, Wang Zheng, Guitao Shi, et al.. Seasonal Variation of Mercury and Its Isotopes in Atmospheric Particles at the Coastal Zhongshan Station, Eastern Antarctica. Environmental Science and Technology, 2020, 54, pp.11344 - 11355. ⟨10.1021/acs.est.0c04462⟩. ⟨hal-04382834⟩
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