FINAL MODEL CONFIGURATION Sample Clauses

FINAL MODEL CONFIGURATION. The definition of the final model configurations was based on the results of the preliminary modelling results and model performance evaluation, as well as the results of the model sensitivity simulations. Tables 6-3 and 6-4 contain the initial and final configurations for the, respectively, CMAQ and CAMx CTMs. The biggest difference in the initial and final versions of the CTMs for the PATH upgrade study are the versions of the CTMs. As the PATH upgrade study has progressed, newer improved versions of the CTMs have been released and we adopted the very latest versions available at the time of the study. In some cases by adopting the newer version of the CTM we obtain technical improvements to the models not reflected in Tables 6-3 and 6-4. For example, the ISORROPIA aerosol thermodynamics module in CMAQ V4.7.1 has many improvements over the one in CMAQ V4.6. In other cases, the newer CTMs have new improved algorithms or options. For example, CAMx has upgraded its chemistry solver from the CMC to EBI. In addition, the newer CAMx CTM has a newer dry deposition scheme (Xxxxx et al., 2003; 2006) than used in the initial configuration (Xxxxxx, 1989). Table 6-3. Initial and final configuration for the CMAQ modelling system in the PATH upgrade project. Science Options Initial Configuration Final Configuration Model Code CMAQ Versions 4.6 (Oct 2006) CMAQ Version 4.7.1 (June 2010) Horizontal Grid Mesh 27/9/3/1 km 27/9/3/1 km Vertical Grid Mesh 26 Layers 26 Layers Grid Interaction One-way nesting One-way nesting Initial Conditions GEOS-CHEM global chemistry model for 27 km domain; finer grid domains based on next coarser grid GEOS-CHEM global chemistry model for 27 km domain; finer grid domains based on next coarser grid Boundary Conditions GEOS-CHEM global chemistry model for 27 km domain GEOS-CHEM global chemistry model for 27 km domain Emissions Emissions Processing SMOKE and CONCEPT SMOKE Sub-grid-scale Plumes No Plume-in-Grid (PinG) No PinG Chemistry Gas Phase Chemistry CB05 and SAPRC99 CB05 Aerosol Chemistry AE4/ISORROPIA AE4/ISORROPIA Secondary Organic Aerosols Secondary Organic Aerosol Model (SORGAM) SORGAM Cloud Chemistry RADM-type aqueous chemistry RADM N2O5 Reaction Probability 0.01 – 0.001 0.01 – 0.001 Meteorological Processor MCIP V3.3 (Aug 2007) MCIP V3.4.1 (Dec 2008) Horizontal Transport Xxxx Xxxxxxxxxxx K-theory with Kh grid size dependence K=theory Vertical Transport Eddy Diffusivity ACM2 and Eddy ACM2 Deposition Scheme M3Dry (Pleim-Xiu) M3Dry Nume...
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