Mathematics – Logic
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.a54d..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #A54D-04
Mathematics
Logic
[0315] Atmospheric Composition And Structure / Biosphere/Atmosphere Interactions, [3307] Atmospheric Processes / Boundary Layer Processes, [3322] Atmospheric Processes / Land/Atmosphere Interactions
Scientific paper
Over the past fifteen years, a number of intensive field campaigns and measurement networks have provided valuable information on the estimated rates of mercury wet deposition to sensitive ecosystems throughout the world. In contrast, the ability to place bounds on the rates of mercury dry deposition has been hampered by the relative lack of direct measurements of this process. Recently, a number of researchers have performed measurements of mercury dry deposition using a variety of direct and indirect measurement techniques. While these studies have provided important information regarding the potential rates of mercury dry deposition to natural surfaces, little is known about the comparability of the results utilizing these different measurement approaches. During the month of August 2008, a mercury dry deposition measurement methods comparison was conducted in Ann Arbor, Michigan over a nine-day period. Seven research groups participated in the study, with the following measurement approaches: water, cation exchange membrane, chemically treated filter and turf surrogate surfaces; and several micrometeorological modeling methods. Continuous monitoring was conducted for ambient meteorological conditions and elemental, oxidized and particulate mercury concentrations. Preliminary results suggest that study-average mercury dry deposition estimates ranged from 0.17 to 0.59 ng/m2/hour for the group of pure-water surrogate surfaces, the cation exchange membrane and a micrometeorological flux gradient approach. The turf surrogate surface, BrCl spiked-water surface and a gold-coated quartz fiber filter surface resulted in significantly higher mercury dry deposition estimates, with the latter two approaches having been designed to measure total mercury dry deposition. Given that the turf surrogate surface and the cation exchange membrane samplers were designed for long-term deployment (up to one week), these methods were deployed for an additional series of four one-week periods. The turf surrogate surface again resulted in a significantly greater estimate of mercury dry deposition (1.59 ng/m2/hour) than that obtained using the cation exchange membrane (0.19 ng/m2/hour). When the turf surrogate surface estimate was adjusted for total surface area, as opposed to its footprint area, the deposition estimate (0.17 ng/m2/hour) was more consistent with that obtained from the cation exchange membrane.
Brooks Shimon
Gustin Mae S.
Holsen T.
Landis M.
Marsik F. J.
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