6.1
Impacts of simulated stability on simulated PM2.5 concentrations

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Thursday, 27 January 2011: 8:30 AM
Impacts of simulated stability on simulated PM2.5 concentrations
3A (Washington State Convention Center)
Nicole Mölders, University of Alaska, Fairbanks, AK; and K. Brunner, H. N. Q. Tran, and G. Kramm

Recently, the Environmental Protection Agency (EPA) tightened the previous National Ambient Air Quality 24-hour standard for particulate matter with aerodynamic diameter <2.5&mu m (PM2.5) to 35&mu g/m3. Since the observational data collected in the Fairbanks area indicated that PM2.5 concentrations exceeded the new standard periodically during the past years, a PM2.5 nonattainment area was assigned. An Alaska-optimized version of WRF/Chem is run for winter 2008/09. Results of the simulation using different parameterizations of the atmospheric boundary layer and surface layer processes will be presented and the impact of simulated stability on simulated PM2.5 concentrations will be discussed. We will evaluate the model performance with available meteorological and PM2.5 measurements.