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CMAQv5.3.2 ozone simulations over the Northern Hemisphere: model performance and sensitivity to model configuration
Citation:
Hogrefe, C., R. Gilliam, R. Mathur, B. Henderson, G. Sarwar, Keith Wyat Appel, G. Pouliot, J. Willison, R. Miller, J. Vukovich, A. Eyth, K. Talgo, C. Allen, AND K. Foley. CMAQv5.3.2 ozone simulations over the Northern Hemisphere: model performance and sensitivity to model configuration. 20th Annual CMAS Conference, NA, North Carolina, November 01 - 05, 2021.
Impact/Purpose:
This abstract and eventual presentation provide an overview of the 2002 – 2017 hemispheric CMAQ simulations performed for the EQUATES project. These simulations serve a dual purpose: they provide a characterization of large-scale background concentrations and their trends and variability for the 2002 – 2017 12 km CMAQ simulations performed over the conterminous U.S., and they also serve as a computationally efficient testbed for exploring model sensitivities and effect of model updates over extended spatial and temporal scales. Performing a detailed evaluation of these simulations can be used to guide future model development.
Description:
This presentation will provide an overview of the recently completed 2002 – 2017 Community Multiscale Air Quality (CMAQ) version 5.3.2 model simulations performed over the Northern Hemisphere for EPA’s Air QUAlity TimE Series Project (EQUATES) project. After presenting a brief summary of the base model configuration which includes the Weather Research and Forecasting (WRF) version 4.1.1 model and an emissions dataset developed for EQUATES, model estimates of ozone will be compared against surface observations, satellite retrievals, and ozonesonde observations for different regions. Initial results indicate a persistent overestimation of summertime surface ozone and a tendency to underestimate springtime ozone both at the surface and aloft. Regional variations in modeled ozone trends are found to be in good agreement with observations. The presentation will also include an analysis of variability and trends in ozone and other longer-lived species simulated by hemispheric CMAQ at the boundaries of a 12km modeling domain covering the conterminous U.S. Finally, we will present results from sensitivity simulations performed for 2010 to investigate the impacts of several model configuration options (including biogenic volatile organic compound emissions, soil nitrogen oxide emissions, and WRF cumulus parameterization) on model estimates.
