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(MAC-MAQ) Conference - Development and evaluation of the coupled MPAS-CMAQ model system
Citation:
Pleim, Jon, D. Wong, R. Gilliam, J. Willison, R. Bullock, J. Herwehe, C. Hogrefe, AND G. Pouliot. (MAC-MAQ) Conference - Development and evaluation of the coupled MPAS-CMAQ model system. Meteorology and Climate – Modeling for Air Quality (MAC-MAQ) Conference, Davis, CA, September 15 - 17, 2021.
Impact/Purpose:
To report on progress for development of the Advanced Air Quality Modeling System (AAQMS) to the scientific community
Description:
The USEPA has embarked on the Advanced Air Quality Modeling System (AAQMS) project to enable modeling of air quality from global to regional to local scales. The system will have three configurations: 1. Global meteorology with seamless mesh refinement and online (coupled) atmospheric chemistry; 2. Regional (limited area) online meteorology and chemistry; and 3. Offline (sequential) regional meteorology and chemistry. We have developed a global online configuration which includes the Model for Prediction Across Scales – Atmosphere (MPAS-A) v7.0, developed at the National Center for Atmospheric Research (NCAR), coupled with the latest version of the Community Multiscale Air Quality (CMAQv5.3.2) model developed at the U.S. EPA. In this presentation we will present the design and development of the coupled MPAS-CMAQ system. We will also show comprehensive full-year evaluation of meteorology simulated by the EPA-enhanced version of MPAS-A that includes the addition of four-dimensional data assimilation (FDDA), the ACM2 PBL model, PX land surface model, and enhanced Kain-Fritsch convection with dynamic timescale and feedback to the radiative schemes on two global meshes with refinement over North America. We will present our most recent testing and evaluation of air quality simulations by the coupled MPAS-CMAQ system. Global emissions from EDGAR-HTAP are combined with the 2016 EPA National Emission Inventory for the U.S., supplemented by biogenic emissions provided by the inline Model of Emissions of Gases and Aerosols from Nature (MEGANv3.1). Global ozone fields from the Copernicus Atmosphere Monitoring Service (CAMS) are used for a “hot start” and for stratospheric ozone data assimilation in the upper layers of the model for the entire simulation. Air quality evaluation includes comparisons to gas and aerosol surface-based measurement networks in the U.S. and other regions of the world. In addition, we compare to global satellite data such as MODIS AOD and OMI NO2, along with comparisons to the WOUDC global ozonesonde network.