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Modeling

Air quality and visibility modeling in support of regional haze planning in the WRAP region was the responsibility of the WRAP Modeling Forum’s Regional Modeling Center (RMC). The RMC used the air pollution emissions data as described and displayed in the TSS Emissions Section to simulate historic air quality conditions and estimate the benefit of emissions reductions programs in the future. The RMC used regional gridded dispersion models for these simulations. This TSS section provides key summary air quality/visibility modeling data through enhanced analysis and display tools.

Modeling Data Analysis Tools

Model Performance Tool

Model Performance Tool

The Model Performance Tool can be used to gauge model performance on a sits-by-site bases by comparing the 2002 modeling results with the IMPROVE monitoring data collected in 2002. Navigation Note: 1) Click the link above, 2) Select a site(s), 3) Click the "Modeling" button below the map, and 4) Select the "Assess Model Performance" link.
Visibility Modeling Results Tool

Visibility Modeling Results Tool

The Visibility Modeling Results Tool provides access to the air quality model visibility results. From this tool results can be reviewed based on visibility parameters, emissions scenarios, averaging periods, and aggregation methods. Navigation Note: 1) Click the link above, 2) Select a site(s), 3) Click the "Modeling" button below the map, and 4) Select the "Visibility Modeling Results" link.
Visibility Projections Tool

Visibility Projections Tool

The Visibility Projections Tool is very similar to the Monitoring Glide Slope Tool, in that it displays the Regional Haze Rule glide slope information. This tool adds the model-based projected 2018 visibility results, which is required for a regional haze reasonable progress demonstration. Navigation Note: 1) Click the link above, 2) Select a site(s), 3) Click the "Modeling" button below the map, and 4) Select the "Visibility Projections" link.

Modeling Methods

Air Quality Modeling:This comprehensive document summarizes the air quality and meteorological models used to evaluate the effects of domain-wide emissions in the WRAP region.
Back Trajectory Modeling:This document describes how the back trajectory modeling was performed.
Key to Monitoring-Modeling-Emissions Mapping:This table summarizes the relationship among real-world visibility-related parameters and parameters defined by the IMPROVE program, the CMAQ and CAMx models, and WRAP emissions inventories. Specific topical designations and direct comparisons are presented. (HTML or Excel)

Modeling Links and Projects

WRAP Regional Modeling Center (RMC):The WRAP RMC assisted State and Tribal agencies in conducting regional haze analyses over the western U.S. by operating regional scale, three-dimensional air quality models that simulate the emission, transformation, and transport of pollutants and the effects on visibility in WRAP Class I Areas.