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Atmospheric Modeling Tools
- Models-3 Community Multiscale Air Quality (CMAQ) Modeling System
The primary goals for the Models-3/Community Multiscale Air Quality (CMAQ) modeling system are to improve 1) the environmental management community’s ability to evaluate the impact of air quality management practices for multiple pollutants at multiple scales and 2) the scientist’s ability to better probe, understand, and simulate chemical and physical interactions in the atmosphere.
- Mesoscale Meteorological Model
The fifth-generation Penn State/NCAR Mesoscale Model (MM5) is the primary tool for providing meteorological input for the Community Multi-scale Air Quality Model (CMAQ).
- Emission Systems
- Sparse Matrix Operator Kernel Emissions (SMOKE)
The environmental community has developed advanced numerical air quality models (AQMs) to understand the interactions among meteorology, emissions (both man-made and biogenic), and pollutant chemistry and dynamics. Emissions data from emissions models and regulatory inventories are one of the most important inputs for these air quality models. Scientist use air quality modeling for a number of purposes: for state and federal implementation plan development, for research on improved modeling methods, and most recently for air quality forecasting.
- Biogenic Emissions Inventory System (BEIS)
First developed in 1988, BEIS estimates volatile organic compound (VOC) emissions from vegetation and nitric oxide (NO) emissions from soils.
- Ammonia Emissions
Approximately 85% of NH3 emissions are estimated to come from agricultural non-point sources, with a suspected strong seasonal pattern in these NH3 emissions. However, the current NH3 emission inventories do not include information needed to distribute the emissions temporally.
- Mercury Modeling
AMD personnel continued participation in the first phase of an intercomparison study of numerical models for long-range
atmospheric transport of mercury sponsored by the European
Monitoring and Evaluation Programme (EMEP) and organized by EMEP’s
Meteorological Synthesizing Center - East in Moscow, Russia.
- Dry Deposition Modeling
As part of
the
Community Multi-scale Air Quality Model (CMAQ) development, a new method for modeling dry deposition of
gaseous chemical species was developed to take advantage of the more
sophisticated surface model, PX LSM, implemented in MM5.
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Other Regional Air Quality and Deposition Models
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Regional Acid Deposition Model (RADM)
An operational version of the Extended Regional Acid
Deposition Model (RADM) that operates on the
Cray ® T3D ™1 massively parallel computer was completed for application studies. The Extended
RADM incorporates the full dynamics of secondary inorganic fine particle
formation to be able to simulate ammonia (reduced nitrogen)
deposition in addition to oxidized nitrogen deposition.
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Local Scale Modeling
- Human Exposure Modeling
- Miscellaneous Models
The following programs and files are in support of the Atmospheric Modeling Division. They include field data for model evaluation
and development, air quality models, and some miscellaneous files.
Multimedia Modeling Tools
- Climatological Deposition for Multimedia Modeling: Aggregation and the R Aggregation Tool
Climatological, i.e., representative, multi-year average deposition is achieved through what is termed aggregation. Aggregation essentially uses a fixed, archived set of atmospheric transport cases to drive CMAQ air quality modeling simulations. Then the CMAQ transport case outputs are combined via a weighted average to create climatological seasonal and annual average deposition estimates for nitrogen and sulfur across the United States. In the recently updated aggregation approach, 40 new transport cases have been defined to enhance the quality of the resulting deposition estimates.
As part of the AMD multimedia application tool development, the Aggregation tool has been converted to work with CMAQ output and implemented using R, an open source statistical package. It is now called RAGG. The RAGG output is in Models-3/IO-API format and can be visualized with PAVE. RAGG has been set up for both Unix/Linux and Windows platforms and is available for download on the Web. R is a widely used and supported open source statistical package that is free. DOWNLOAD Click here to go to the AMD anonymous ftp site to download the RAGG package, manual and example data. RAGG Click here for more information about Aggregation and for the RAGG manual.
To install R go to the R website at www.r-project.org/ and follow their instructions. To install PAVE go to the CMAS website at www.cmascenter.org and follow their instructions.
- Atmospheric Deposition Link to Watersheds: Deposition Mapping Tool
Coming in the future
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You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader. |
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