Isotopic compositions of atmospheric total gaseous mercury in 10 Chinese cities and implications for land surface emissions
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Published:2021-05-04
Issue:9
Volume:21
Page:6721-6734
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Fu XuewuORCID, Liu Chen, Zhang Hui, Xu Yue, Zhang Hui, Li JunORCID, Lyu Xiaopu, Zhang Gan, Guo HaiORCID, Wang Xun, Zhang LeimingORCID, Feng XinbinORCID
Abstract
Abstract. Land surface emissions are an important source of atmospheric total gaseous
mercury (TGM); however, its role on the variations of TGM isotopic
compositions and concentrations has not been properly evaluated. In this
study, TGM isotope compositions, a powerful tracer for sources and
transformation of Hg, were measured at 10 urban sites and one rural site in
China. TGM concentrations were higher in summer than in winter in most
cities except in Guiyang and Guangzhou in the low latitudes. The summertime
high TGM concentrations coincided with prevailing low TGM δ202Hg and high TGM Δ199Hg signatures. These seasonal
patterns were in contrast with those typically observed in rural areas in
the Northern Hemisphere, suggesting that atmospheric oxidation chemistry,
vegetation activity and residential coal combustion were likely not
the dominant mechanisms contributing to the TGM concentration and isotopic
composition seasonality in Chinese cities. The amplitudes of seasonal
variations in TGM concentrations and Δ199Hg (or TGM δ202Hg) were significantly positively (or negatively) correlated with
that of the simulated soil GEM emission flux. These results suggest that the
seasonal variations in TGM isotopic compositions and concentrations in the
10 Chinese cities were likely controlled by land surface emissions that
were observed or reported with highly negative δ202Hg
signatures.
Funder
Chinese Academy of Sciences
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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