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| Titel |
Investigation of effects of varying model inputs on mercury deposition estimates in the Southwest US |
| VerfasserIn |
T. Myers, R. D. Atkinson, O. R. Bullock, J. O. Bash |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 2 ; Nr. 13, no. 2 (2013-01-23), S.997-1009 |
| Datensatznummer |
250017612
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| Publikation (Nr.) |
 copernicus.org/acp-13-997-2013.pdf |
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| Zusammenfassung |
| The Community Multiscale Air Quality (CMAQ) model version 4.7.1 was used to
simulate mercury wet and dry deposition for a domain covering the
continental United States (US). The simulations used MM5-derived
meteorological input fields and the US Environmental Protection Agency (EPA)
Clear Air Mercury Rule (CAMR) emissions inventory. Using sensitivity
simulations with different boundary conditions and tracer simulations, this
investigation focuses on the contributions of boundary concentrations to
deposited mercury in the Southwest (SW) US. Concentrations of oxidized
mercury species along the boundaries of the domain, in particular the upper
layers of the domain, can make significant contributions to the simulated
wet and dry deposition of mercury in the SW US. In order to better
understand the contributions of boundary conditions to deposition, inert
tracer simulations were conducted to quantify the relative amount of an
atmospheric constituent transported across the boundaries of the domain at
various altitudes and to quantify the amount that reaches and potentially
deposits to the land surface in the SW US. Simulations using alternate sets
of boundary concentrations, including estimates from global models (Goddard
Earth Observing System-Chem (GEOS-Chem) and the Global/Regional Atmospheric
Heavy Metals (GRAHM) model), and alternate meteorological input fields (for
different years) are analyzed in this paper. CMAQ dry deposition in the SW
US is sensitive to differences in the atmospheric dynamics and atmospheric
mercury chemistry parameterizations between the global models used for
boundary conditions. |
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