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An Overview Of Measurement And Modeling Approaches For The Estimation Of Temporal And Spatial Variations In Mercury Dry-deposition | 18551
ISSN: 2157-7617
Journal of Earth Science & Climatic Change
Open Access
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The atmospheric deposition of mercury occurs through both wet- and dry-deposition processes, with the relative
importance of each process at a given location being related to variations in both meteorology and the proximity to
natural/anthropogenic emissions of mercury. Over the past two decades, a number of field campaigns and measurement
networks have provided valuable information on the temporal and spatial variation of mercury wet-deposition. In contrast,
the ability to similarly characterize mercury dry-deposition has been hampered by the relative lack of such measurements.
Of late, an increasing number of researchers have performed measurements of mercury dry-deposition using a variety of
direct (e.g., surrogate surface) and indirect (e.g., micrometeorological) techniques. While the majority of these measurements
have been performed as part of relatively short-term studies, more recent work has sought to develop approaches that will
allow for the extension of mercury dry-deposition measurements to long-term, unattended modes. These latter developments
would allow such approaches to be used in regional and national networks to address questions related to the temporal and
spatial variability of mercury dry-deposition. This presentation will provide an overview of developments in both direct and
indirect approaches for the measurement of total- and speciated-mercury dry-deposition. Given concurrent advances in
the measurement of ambient, speciated-mercury concentrations, this presentation will also touch upon the current state of
mercury-dry deposition modeling approaches, which can utilize such ambient concentration data to provide another approach
of estimating the temporal and spatial variation of mercury dry-deposition on regional, national and global scales
Biography
Frank J Marsik is an associate research scientist/lecturer in atmospheric science at the University of Michigan, Ann Arbor, MI, USA. He has used a hybrid-approach
to the study of the air-surface exchange of mercury through the performance of combined measurement/modeling studies. This approach has allowed for a better
understanding of the uncertainties associated with both the field measurement and ecosystem-level modeling of mercury dry-deposition. He has been involved
in the development and testing of surrogate surface-based mercury dry-deposition measurement approaches and, in August 2008, he organized an international
intercomparison/workshop of mercury dry-deposition measurement techniques
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