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ACP | Articles | Volume 18, issue 1
Atmos. Chem. Phys., 18, 495–509, 2018
https://doi.org/10.5194/acp-18-495-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 18, 495–509, 2018
https://doi.org/10.5194/acp-18-495-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Jan 2018

Research article | 17 Jan 2018

Gaseous elemental mercury (GEM) fluxes over canopy of two typical subtropical forests in south China

Qian Yu et al.

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Bahlmann, E., Ebinghaus, R., and Ruck, W.: Development and application of a laboratory flux measurement system (LFMS) for the investigation of the kinetics of mercury emissions from soils, J. Environ. Manage., 81, 114–125, https://doi.org/10.1016/j.jenvman.2005.09.022, 2006. 
Bash, J. O. and Miller, D. R.: A relaxed eddy accumulation system for measuring surface fluxes of total gaseous mercury, J. Atmos. Ocean. Tech., 25, 244–257, https://doi.org/10.1175/2007jtecha908.1, 2008. 
Bash, J. O. and Miller, D. R.: Growing season total gaseous mercury (TGM) flux measurements over an Acer rubrum L. stand, Atmos. Environ., 43, 5953–5961, https://doi.org/10.1016/j.atmosenv.2009.08.008, 2009. 
Baya, A. P. and Van Heyst, B.: Assessing the trends and effects of environmental parameters on the behaviour of mercury in the lower atmosphere over cropped land over four seasons, Atmos. Chem. Phys., 10, 8617–8628, https://doi.org/10.5194/acp-10-8617-2010, 2010. 
Boudala, F. S., Folkins, I., Beauchamp, S., Tordon, R., Neima, J., and Johnson, B.: Mercury flux measurements over air and water in Kejimkujik National Park, Nova Scotia, Water Air Soil Poll., 122, 183–202, https://doi.org/10.1023/a:1005299411107, 2000. 
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This study provides high-quality direct observation data of a clean and a contaminated site in subtropical south China and quantifies the natural forest Hg emission. We find that clean and contaminated forests present a net GEM source with annual average values of 6.67 and 0.30 ng m-2 h-1, respectively; daily variations of GEM fluxes showed a source in the daytime with a peak at 13:00, and as a sink or balance at night; and higher atmospheric GEM concentration restricted the forest GEM emission.
This study provides high-quality direct observation data of a clean and a contaminated site in...
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