HR: 10:35h
AN: A12C-02    [Abstracts]
TI: Evaluation of Air Quality Predictions from MOZART-4
AU: * Emmons, L
EM: emmons@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: Pfister, G
EM: pfister@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: Hess, P
EM: pgh25@cornell.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: Hess, P
EM: pgh25@cornell.edu
AF: Cornell University, Dept. of Biological and Environmental Engineering, Ithaca, NY 14853, United States
AU: Lamarque, J
EM: lamar@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AU: Edwards, D
EM: edwards@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States
AB: Chemical simulations from the Model for Ozone and Related Chemical Tracers, version 4 (MOZART-4) have been used in numerous studies to analyze the impact of various sources, such as wildfires and megacities, on global air quality. MOZART-4 has also been used to provide chemical forecasts in support of aircraft experiments, most recently for the NSF-organized Megacities Impact on Regional and Global Environment (MIRAGE) and NASA's Intercontinental Chemical Transport Experiment (INTEX-B). Direct comparisons of MOZART, interpolated to the time and location of measurements, have shown generally good agreement with the aircraft measurements of MIRAGE and INTEX-B, as well as with satellite observations, such as MOPITT CO. Where there are discrepancies, it is challenging to distinguish between errors in emission inventories and errors in the representation of chemistry or physical processes in the model. Comparisons of tracer-tracer correlations (such as for volatile organic compounds with different photochemical lifetimes or different sources) between measurements and simulations will be used to help identify the source of model errors. Artificial tracers, such as temporally and spatially "tagged" CO, in MOZART simulations will be compared with the determinations of photochemical age derived from the observations. Several regional and global inventories (e.g., Mexico NEI, D. Streets' Asia Inventory, POET, RETRO) will be used in MOZART and the results assessed. The sensitivity of model simulations to horizontal resolution will also be examined. The numerous investigators who have provided the unprecedented high quality observations as part of the MIRAGE, INTEX-B and other experiments are gratefully acknowledged for making their data available for model evaluations such as this.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting