Background. St. Louis Currently Nonattainment for 8-hour Ozone and PM2.5In June 2007 Missouri DNR submitted 8-hour ozone SIP that included a demonstration of attainment by 2009 using the SMOKE/MM5/CAMx modeling system, a 36/12/4 km grid and three 2002 episodesPM2.5 SIP is due April 2008Currently
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1. Hybrid Plume/Grid Modeling for the St. Louis PM2.5 SIP Ralph Morris, Bonyoung Koo, Jeremiah, Johnson and Greg Yarwood
ENVIRON International Corporation
Jay Turner and Jennifer Garlock
International Aerosol Modeling Algorithms Conference
December 5-7, 2007 – UC Davis
4. St. Louis Regional PM2.5 Modeling 36/12 km Modeling Grid
MM5 Meteorological Model
SMOKE Emissions Model
CMAQ & CAMx photochemical grid models
Model Performance Evaluation
Initially with Routine STN and FRM Networks
More Detailed with St. Louis Super Site
PM Source Apportionment Technology (PSAT)
2009 PM2.5 Design Value Projections
14. Wind Analysis of Local vs. Regional PM2.5 Concentrations at Granite City Monitor (B) Identifies GCW Steel Mill & Coke Ovens as Local Contributor
15. St. Louis PM2.5: Regional and Local Problem CMAQ/CAMx 36/12 km Modeling Insufficient to Capture Local Contributions – Need Enhanced Approach:
Use hybrid Plume/Grid modeling approach with AERMOD/ISC Local and CMAQ/CAMx: Problems with mixing modeling results as CMAQ/CAMx designed to be accurate, AERMOD/ISC designed to be conservative.
Use Grid Model with Plume-in-Grid (PiG) for local-scale sources: 12 km grid still very course for sources not treated with PiG.
Use CMAQ/CAMx with finer grids: For example 36/12/4/1.33 km, however even 1.33 km may be insufficient to model local source impacts at Granite City
Use combined CMAQ/CAMx finer grids with PiG for local sources: Combines best features of (2) and (3) without problems of (1).
? Decision to proceed with high resolution grid with PiG model (Option 4).
24. St. Louis Hybrid Multi-Scale PM Modeling Approach Global-Scale: GEOS-CHEM provided BCs to Inter RPO USA 36 km Domain
Continental-Scale: VISTAS 36 km CMAQ simulations for 2002, 2009 and 2018
Regional-Scale: 36/12 km CMAQ/CAMx modeling of StL regional-scale domain
Urban-Scale: CAMx 12/4/1 km two-way nesting
Local-Scale: Plume-in-Grid with CAMx two-way 12/4/1 km grids