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Operational Evaluation of Atmospheric Mercury Simulation Using the Community Multiscale Air Quality (Cmaq) Model

By Bullock, O. Russell, Jr.

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Book Id: WPLBN0000066422
Format Type: PDF eBook
File Size: 0.1 MB
Reproduction Date: 2007
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Title: Operational Evaluation of Atmospheric Mercury Simulation Using the Community Multiscale Air Quality (Cmaq) Model  
Author: Bullock, O. Russell, Jr.
Volume:
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
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Publisher: United States Environmental Protection Agency

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Bullock, Jr, O. R. (n.d.). Operational Evaluation of Atmospheric Mercury Simulation Using the Community Multiscale Air Quality (Cmaq) Model. Retrieved from http://www.worldebooklibrary.net/


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Excerpt: Scientific Problem and Policy Issues Many areas of the United States currently have public advisories regarding the consumption of mercury-contaminated fish. The atmosphere is known to be the primary source of mercury entering aquatic ecosystems. The Community Multiscale Air Quality (CMAQ) numerical simulation model is being expanded to help identify the air emission sources responsible for this atmospheric deposition of mercury. Evaluation of simulation models by comparison of their simulation results to actual observations is necessary to establish an appropriate level of confidence in the models and to identify missing or inaccurate process information so that model improvements can be made. The testing performed for this study has shown that CMAQ mercury simulations of mercury wet deposition are more accurate in the cool seasons when precipitation is primarily from large-scale weather features, but less accurate when small-scale convective precipitation is most prevalent. Measurement of mercury dry deposition has only been attempted on an experimental basis, and model testing for this pathway for atmospheric mercury deposition is not yet feasible.

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