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SELECTED RESULTS OF MODELING WITH THE CMAQ PLUME-IN-GRID APPROACH

Published byAndrew Porter Modified over 6 years ago

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Presentation on theme: "SELECTED RESULTS OF MODELING WITH THE CMAQ PLUME-IN-GRID APPROACH"— Presentation transcript:

1 SELECTED RESULTS OF MODELING WITH THE CMAQ PLUME-IN-GRID APPROACH
James Godowitch# NOAA Air Resources Laboratory Atmospheric Sciences Modeling Division Research Triangle Park, NC # On assignment to the EPA / ORD National Exposure Research Laboratory Models-3 Users’ Workshop Presentation - October 21, 2002

2 Spatial Resolution Issue for Point Source Emissions Released Into Eulerian Grid Cells

3 MODEL SIMULATION DETAILS
Applied CMAQ release version Simulation period - July 1-16, 1995 Runs without PinG and with PinG Domains : 12 km SOS region and 36 km eastern U.S. Chemistry – CB4 or RADM2 with SMVGEAR solver 1995 Emissions , CEM data for major point sources PinG treatment applied to 77 and 45 MEPSEs in the 36 km and 12 km domains, respectively

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5 TRAJECTORIES FOR PLUME RELEASE 16 IN A 36 km GRID DOMAIN - July 7, 1995

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7 PLUME OZONE AT 20 , 80, 160 KM DOWNWIND ( MODEL AND DATA )

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12 CTM NoPinG 36 km Ozone Results Higher than CTM/PinG in High Point Source Emission Region

13 CMAQ NoPinG Slightly Higher in 12 km Results

14 CMAQ 36 km NoPinG Results and Obs

15 CMAQ/CTM PinG and NoPinG vs Obs Maximum 1-hr Ozone Concentrations

16 CMAQ CTM/PinG Results Track Observed Ozone Better at the Dickson, TN Site

17 CTM/NoPinG and PinG Results Comparable at Dickson Site for the 12 km Grid Domain

18 SUMMARY OF MODEL RESULTS
Higher ozone without PinG treatment in the 36 km and 12 km domains ( Greatest differences in high NOx point source grid cells and downwind vicinity ) Better agreement between CTM/PinG results and observed ozone than NoPing results for 36 km domain, comparable results found for the 12 km domain Model results differ for other species (ex. SO2 , HNO3 … )

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