Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.b33c0432p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #B33C-0432
Physics
0426 Biosphere/Atmosphere Interactions (0315), 0461 Metals, 0471 Oxidation/Reduction Reactions (4851), 0497 Wetlands (1890)
Scientific paper
Berry's Creek is a tidal tributary to the Hackensack River, and was historically subjected to discharges of mercury from the Ventron-Velsicol mercury processing site. The emission of mercury from this site to the atmosphere can follow three pathways: 1) emission from the water column, 2) transpiration through plants, and 3) emission from exposed wetland sediments. In this poster, we present a comparison of the first two emission pathways which have been studied at this site to date. Emission of mercury from the water column mercury to the atmosphere results from complex biogeochemical reactions between photoreactive dissolved organic carbon, ultraviolet light, and dissolved aqueous mercury. Emission rates measured using a dynamic flux chamber ranged from -0.64 to 34 ng/m2-h. Solar radiation and DOC spectral slope appear to exert the strongest control on mercury emission, with solar radiation alone accounting for up to 98% of the diel changes in mercury emission. Emission of mercury from plants appears to be a complex process that includes emission of mercury along with water vapor during transpiration as well as deposition to plant surfaces. Emission rates from Phragmites australis leaves ranged from -0.64 to 0.17 ng/m2-h. Annual and diel cycles are considered in an estimation of the magnitude of total mercury emitted through each pathway over the duration of 1 year.
Bubb M.
Peters Steve
Wollenberg J.
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