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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-816
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-816
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  31 Aug 2020

31 Aug 2020

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This preprint is currently under review for the journal ACP.

Soil-atmosphere exchange flux of total gaseous mercury (TGM) in subtropical and temperate forest catchments

Jun Zhou1,2,3, Zhangwei Wang1,3, Xiaoshan Zhang1,3, Charles T. Driscoll4, and Che-Jen Lin5 Jun Zhou et al.
  • 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • 2Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Department of Civil and Environmental Engineering, Syracuse University, 151 Link Hall, Syracuse, New York 13244, USA
  • 5Center for Advances in Water and Air Quality, Lamar University, Beaumont, Texas 77710, USA

Abstract. Evasion from soil is the largest source of mercury (Hg) to the atmosphere in terrestrial ecosystems. To improve understanding of controls and reduce uncertainty in estimates of forest soil-atmosphere exchange, soil-air total gaseous Hg (TGM) fluxes were measured for 130 and 96 days for each of four plots at a subtropical forest and a temperate forest, respectively. The soil-air TGM fluxes, measured using dynamic flux chambers (DFC), showed patterns of both emission and deposition at five study plots, with an area-weighted net emission rate of 3.2 and 0.32 ng m−2 hr−1 for the entire subtropical and temperate forests, respectively. At the subtropical forest, the highest fluxes and net soil Hg emission were observed for an open field, with lesser emission rates in coniferous (Masson pine) and broad-leaved (camphor) forests, and net deposition in a wetland. At the temperate forest, the highest fluxes and net soil Hg emission were observed for a wetland and an open field, with lesser emission rates in deciduous broad-leaved and deciduous needle-leaf (larch) forests, and net deposition in an evergreen pine forest (Chinese pine). High solar radiation and temperature in summer resulted in the high Hg emission at the subtropical forest, and open field and evergreen pine forest in the temperate forest. In the temperate deciduous plots, the highest Hg emission was in spring during leaf-off period due to direct solar radiation exposure to soils. Fluxes showed strong positive relationships with solar radiation and soil temperature, and negative correlations with ambient-air TGM concentration in both subtropical and temperate forests, with area-weighted compensation points of 6.82 and 3.42 ng m−3, respectively. The compensation points implicated that the atmospheric TGM concentration plays a critical role in inhibiting the TGM emission from forest floor. More attention should pay to the legacy Hg stored in terrestrial surface as a more important increasing Hg emission source with the decreasing air TGM concentration recently.

Jun Zhou et al.

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Short summary
Mercury emissions from the natural resource exists a large uncertainty, which was mainly derived from the forest. Long-term and multi-plot (ten) study of soil-air fluxes at the subtropical and temperate forests was conducted and reduced the uncertainty in soil-air Hg fluxes. Forest soils are important atmospheric Hg source, especially for subtropical forest. The compensation points implicated that the atmospheric Hg concentration plays a critical role in inhibiting Hg emission from forest floor.
Mercury emissions from the natural resource exists a large uncertainty, which was mainly derived...
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