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Table 3.

Summary of chemistry and aerosol options used in the model intercomparison. DOI: https://doi.org/10.1525/elementa.2021.00139.t3

ModelChemistry MechanismAerosol Thermodynamics + MicrophysicsSOA Precursors + Scheme
GEOS-Chem (SNU) GEOS-Chem Tropchem (Mao et al., 2012; Fisher et al., 2016; Marais et al., 2016) ISORROPIA II (Fountoukis and Nenes, 2007) + Bulk scheme Anthropogenic and biomass burning precursors scaled by CO emission + biogenic precursors scaled by isoprene, monoterpene emissions + simplified SOA with no VBS (Hodzic and Jimenez, 2011) 
CAM-Chem (NCAR) MOZART-T1 (Emmons et al., 2020) N/A + MAM4 (Liu et al., 2016) Aromatics, isoprene, terpenes, S/IVOCs + MAM4 with 5-bin VBS (Tilmes et al., 2019) 
CAMx (Ajou) SAPRC99 (Carter, 2000) ISORROPIA I (Nenes et al., 1998) + CF scheme Aromatics, isoprene, terpenes + the original Secondary Organic Aerosol Partitioning (SOAP) (Strader et al., 1999) 
WRF-Chem (NCAR) MOZART-4 + updates from Knote et al. (2014)  MESA + MOSAIC (Zaveri et al., 2008) Anthropogenic and biomass burning precursors scaled by CO emission + simplified SOA with no VBS (Hodzic and Jimenez, 2011) + 2-product approach for biogenic SOA (Shrivastava et al., 2011) 
WRF-Chem (PNU) RACM-ESRL (Ahmadov et al., 2015) MARS (Grell et al., 2005) + MADE (Ackermann et al., 1998) Alkanes, alkenes, aromatics, cresol, isoprene, terpenes + 4-bin VBS from Ahmadov et al. (2012)  
WRF-Chem (Iowa) Reduced hydrocarbon mechanism from Pfister et al. (2014)  MESA + MOSAIC Anthropogenic and biomass burning precursors scaled by CO emission + simplified SOA with no VBS (Hodzic and Jimenez, 2011) + 2-product approach for biogenic SOA (Shrivastava et al., 2011) 
WRF-Chem (UCLA) RACM-ESRL MARS + MADE Alkanes, alkenes, aromatics, cresol, isoprene, terpenes + 4-bin VBS from Ahmadov et al. (2012)  
CMAQ (Inha) CB05-TU (Whitten et al., 2010) ISORROPIA I + AERO5 (Foley et al., 2010) Alkanes, aromatics, isoprene, terpenes + 2-product approach using yields from Carlton et al. (2010)  
ModelChemistry MechanismAerosol Thermodynamics + MicrophysicsSOA Precursors + Scheme
GEOS-Chem (SNU) GEOS-Chem Tropchem (Mao et al., 2012; Fisher et al., 2016; Marais et al., 2016) ISORROPIA II (Fountoukis and Nenes, 2007) + Bulk scheme Anthropogenic and biomass burning precursors scaled by CO emission + biogenic precursors scaled by isoprene, monoterpene emissions + simplified SOA with no VBS (Hodzic and Jimenez, 2011) 
CAM-Chem (NCAR) MOZART-T1 (Emmons et al., 2020) N/A + MAM4 (Liu et al., 2016) Aromatics, isoprene, terpenes, S/IVOCs + MAM4 with 5-bin VBS (Tilmes et al., 2019) 
CAMx (Ajou) SAPRC99 (Carter, 2000) ISORROPIA I (Nenes et al., 1998) + CF scheme Aromatics, isoprene, terpenes + the original Secondary Organic Aerosol Partitioning (SOAP) (Strader et al., 1999) 
WRF-Chem (NCAR) MOZART-4 + updates from Knote et al. (2014)  MESA + MOSAIC (Zaveri et al., 2008) Anthropogenic and biomass burning precursors scaled by CO emission + simplified SOA with no VBS (Hodzic and Jimenez, 2011) + 2-product approach for biogenic SOA (Shrivastava et al., 2011) 
WRF-Chem (PNU) RACM-ESRL (Ahmadov et al., 2015) MARS (Grell et al., 2005) + MADE (Ackermann et al., 1998) Alkanes, alkenes, aromatics, cresol, isoprene, terpenes + 4-bin VBS from Ahmadov et al. (2012)  
WRF-Chem (Iowa) Reduced hydrocarbon mechanism from Pfister et al. (2014)  MESA + MOSAIC Anthropogenic and biomass burning precursors scaled by CO emission + simplified SOA with no VBS (Hodzic and Jimenez, 2011) + 2-product approach for biogenic SOA (Shrivastava et al., 2011) 
WRF-Chem (UCLA) RACM-ESRL MARS + MADE Alkanes, alkenes, aromatics, cresol, isoprene, terpenes + 4-bin VBS from Ahmadov et al. (2012)  
CMAQ (Inha) CB05-TU (Whitten et al., 2010) ISORROPIA I + AERO5 (Foley et al., 2010) Alkanes, aromatics, isoprene, terpenes + 2-product approach using yields from Carlton et al. (2010)  

MOSAIC = Model for Simulating Aerosol Interactions and Chemistry; MADE = Modal Aerosol Dynamics Model for Europe; CF = Coarse/Fine; MAM4 = Modal Aerosol Model with 4 modes; VBS = volatility basis set.

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