Lidar mapping of atmospheric atomic mercury in the Wanshan area, China

Environmental Pollution
Ming LianS Svanberg

Abstract

A novel mobile laser radar system was used for mapping gaseous atomic mercury (Hg0) atmospheric pollution in the Wanshan district, south of Tongren City, Guizhou Province, China. This area is heavily impacted by legacy mercury from now abandoned mining activities. Differential absorption lidar measurements were supplemented by localized point monitoring using a Lumex RA-915M Zeeman modulation mercury analyzer. Range-resolved concentration measurements in different directions were performed. Concentrations in the lower atmospheric layers often exceeded levels of 100 ng/m3 for March conditions with temperature ranging from 5 °C to 20 °C. A flux measurement of Hg0 over a vertical cross section of 0.12 km2 resulted in about 29 g/h. Vertical lidar sounding at night revealed quickly falling Hg0 concentrations with height. This is the first lidar mapping demonstration in a heavily mercury-polluted area in China, illustrating the lidar potential in complementing point monitors.

Citations

Mar 18, 2020·International Journal of Environmental Research and Public Health·Wen SongFuping Li
Jun 30, 2019·Optics Express·Jim LarssonMikkel Brydegaard
Dec 1, 2019·The Science of the Total Environment·Seth N LymanLeiming Zhang
Aug 14, 2020·The Science of the Total Environment·Mae Sexauer GustinTong Zhang

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