Abstract
The Florida Everglades Dry Deposition Study (FEDDS) was conducted to test newly developed measurement techniques used to quantify the dry-deposition of speciated mercury to the Florida Everglades ecosystem. One component of FEDDS employed micrometeorological and dynamic flux chamber techniques to study the air−surface exchange of gaseous elemental mercury over a mixed sawgrass/cattail marsh within Water Conservation Area 3. These measurements provided information related to the magnitudes of, and processes associated with, the bi-directional flux of gaseous elemental mercury within this ecosystem for use in the development of a canopy-scale mercury dry deposition model. During the 2000 FEDDS study period, on average elemental gaseous mercury was emitted from the ecosystem during the daytime (16 ± 30 ng m-2 h-1), with deposition observed at night (−1 ± 4 ng m-2 h-1). The measured fluxes followed a diurnal pattern and were positively correlated with ambient temperature, solar radiation, and water vapor flux...
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