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- W4207069525 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> 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 <span class=inline-formula><i>δ</i><sup>202</sup></span>Hg and high TGM <span class=inline-formula>Î<sup>199</sup></span>Hg 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 <span class=inline-formula>Î<sup>199</sup></span>Hg (or TGM <span class=inline-formula><i>δ</i><sup>202</sup></span>Hg) 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 <span class=inline-formula><i>δ</i><sup>202</sup></span>Hg signatures." @default.
- W4207069525 created "2022-01-26" @default.
- W4207069525 date "2021-01-28" @default.
- W4207069525 modified "2023-09-27" @default.
- W4207069525 title "Comment on acp-2020-981" @default.
- W4207069525 doi "https://doi.org/10.5194/acp-2020-981-rc1" @default.
- W4207069525 hasPublicationYear "2021" @default.
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