Spatial variability of mercury emissions from soils in a southeastern US urban environment |
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| Authors: | Mark C Gabriel Derek G Williamson Steve Brooks Hong Zhang Steve Lindberg |
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| Institution: | (1) Department of Civil and Environmental Engineering, The University of Alabama, Box 870205, Tuscaloosa, AL 35487-0205, USA;(2) National Oceanic and Atmospheric Administration (NOAA), ATDD, P.O. Box 2456, Oak Ridge, TN 37831-2456, USA;(3) Department of Chemistry, Tennessee Tech University, P.O. Box 5055, Cookeville, TN 38505-0001, USA;(4) Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA |
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| Abstract: | We quantified gaseous mercury (Hg0) fluxes over soil surfaces in an urban setting during the winters of 2003 and 2004 across the metropolitan area of Tuscaloosa,
AL. The objective was to provide a first inspection of the local spatial variability of mercury flux in an urban area. Flux
sampling took place on bare, undisturbed, soil surfaces within four evenly spaced landuse areas of Tuscaloosa: industrial,
commercial, residential, and mixed landuse. Median total gaseous mercury fluxes (ng/m2 h) from each site were as follows: 4.45 (residential site), 1.40 (industrial site), 2.14 (commercial site), and 0.87 (mixed
landuse site). Using non-parametric statistical analyses, the residential and mixed landuse sites were found to be statistically
different from the overall median flux. Landuse and soil type are the suspected factors primarily controlling the observed
spatially variable fluxes. The presence of statistically different fluxes over soil surfaces on a local scale in this preliminary
study warrants additional investigation, particularly during the spring and summer seasons when terrestrial mercury emission
is the highest. Providing such information will help develop better estimates of mercury emission from urban areas and, ultimately,
lead to more accurate and useful spatially relevant inventories. |
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| Keywords: | Mercury flux Spatial variability Urban area Soil type Alabama |
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