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Gaseous mercury fluxes from the forest floor of the Adirondacks
- Choi, Hyun-Deok, Holsen, Thomas M.
- Environmental pollution 2009 v.157 no.2 pp. 592-600
- correlation, emissions, forest canopy, forest litter, mercury, meteorological data, models, shade, solar radiation, spring, summer, temperature, winter, Adirondacks, New York
- The flux of gaseous elemental mercury (Hg0) from the forest floor of the Adirondack Mountains in New York (USA) was measured numerous times throughout 2005 and 2006 using a polycarbonate dynamic flux chamber (DFC). The Hg flux ranged between -2.5 and 27.2 ng m-2 h-1 and was positively correlated with temperature and solar radiation. The measured Hg emission flux was highest in spring, and summer, and lowest in winter. During leaf-off periods, the Hg emission flux was highly dependent on solar radiation and less dependent on temperature. During leaf-on periods, the Hg emission flux was fairly constant because the forest canopy was shading the forest floor. Two empirical models were developed to estimate yearly Hg0 emissions, one for the leaf-off period and one for the leaf-on period. Using the U.S. EPA's CASTNET meteorological data, the cumulative estimated emission flux was approx. 7.0 μg Hg0 m-2 year-1.