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Description and Initial Simulation of a Dynamic Bidirectional Air-Surface Exchange Model for Mercury in Community Multiscale Air Quality Model
Citation:
BASH, J. O. Description and Initial Simulation of a Dynamic Bidirectional Air-Surface Exchange Model for Mercury in Community Multiscale Air Quality Model. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 115(D06305):1-15, (2010).
Impact/Purpose:
The National Exposure Research Laboratory′s (NERL′s) Atmospheric Modeling and Analysis Division (AMAD) conducts research in support of EPA′s mission to protect human health and the environment. AMAD′s research program is engaged in developing and evaluating predictive atmospheric models on all spatial and temporal scales for forecasting the Nation′s air quality and for assessing changes in air quality and air pollutant exposures, as affected by changes in ecosystem management and regulatory decisions. AMAD is responsible for providing a sound scientific and technical basis for regulatory policies based on air quality models to improve ambient air quality. The models developed by AMAD are being used by EPA, NOAA, and the air pollution community in understanding and forecasting not only the magnitude of the air pollution problem, but also in developing emission control policies and regulations for air quality improvements.
Description:
Emissions of elemental mercury (Hg0) from natural processes are believed to be as large as anthropogenic mercury emissions and are a critical source required to model the transport and fate of mercury. Recent ecosystem scale measurements indicate that a fraction of recently deposited mercury is recycled back into the atmosphere quickly, and that an atmospheric compensation point exists at background ambient concentrations. Modeled Hg0 emissions from natural sources are typically uncoupled from dry deposition estimates and unconstrained by air-biosphere gradient processes needed to parameterize compensation points. A module has been developed for the Community Multiscale Air Quality (CMAQ) model to parameterize concentration-dependent processes of bi-directional mercury exchange.
URLs/Downloads:
Description and Initial Simulation of a Dynamic Bidirectional Air-Surface Exchange Model for Mercury in Community Multiscale Air Quality Model (PDF, NA pp, 1000 KB, about PDF)Journal of Geophysical Research Atmospheres
