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TESTING CMAQ CHEMISTRY SENSITIVITIES IN BASE CHASE AND EMISSION CONTROL RUNS AT SEARCH AND SOS 99 SURFACE SITES IN THE SOUTHEASTERN UNITED STATES
Citation:
ARNOLD, J. AND R. L. DENNIS. TESTING CMAQ CHEMISTRY SENSITIVITIES IN BASE CHASE AND EMISSION CONTROL RUNS AT SEARCH AND SOS 99 SURFACE SITES IN THE SOUTHEASTERN UNITED STATES. ATMOSPHERIC ENVIRONMENT. Elsevier Science Ltd, New York, NY, 40(26):5027-5040, (2006).
Impact/Purpose:
The objectives of this task are to continue development and improvement of EPA's mesoscale (regional through urban scale) air quality modeling systems, such as the Community Multiscale Air Quality (CMAQ) model, as air quality management and NAAQS implementation tools. This task focuses on needed research and development of air quality models targeted for a major CMAQ model release in FY08. Model development for a broad scope of application is envisioned. For example, CMAQ will need to be able to simulate air quality feedbacks to meteorology and climate as well as intercontinental transport. The 2008 release of CMAQ is timed to coincide with EPA/OAR's and the states' needs for an improved model for assessments of progress (mid-course corrections) in the post-SIP submittal timeframe.
Description:
CMAQ was run to simulate urban conditions in the southeastern U.S. in July 1999 at 32, 8, and 2 km grid spacings. Runs were made with two older mechanisms, Carbon Bond IV (CB4) and the Regional Acid Deposition Model, version 2 (RADM2), and with the more recent California Statewide Air Pollution Research Center, version 1999 (SAPRC99) in a sensitivity matrix with a full emissions base case and separate 50% control scenarios for emissions of nitrogen oxides (NOX) and volatile organic compounds (VOC). CMAQ predictions were compared for the Southeastern Aerosol Research and Characterization Study (SEARCH) site at Jefferson Street in Atlanta, GA (JST) and the Southern Oxidant Study (SOS) Cornelia Fort Airpark (CFA) site downwind of Nashville, TN. In the emissions control cases, SAPRC99 was generally more responsive than CB4 and RADM2 to NOX and VOC controls.