Atmospheric Modeling and Analysis Division NERL EPA Overview of New Features in CMAQv50 Highlights CMAQv50 Incorporates many scientific advances to keep abreast of the latest research in gas chemistry aerosol chemistry and thermodynamics aqueous chemistry and photolysis ID: 1026889
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1. Jonathan Pleimand the CMAQ Development TeamAtmospheric Modeling and Analysis Division, NERL, EPAOverview of New Features in CMAQv5.0
2. HighlightsCMAQv5.0 Incorporates many scientific advances to keep abreast of the latest research in gas chemistry, aerosol chemistry and thermodynamics, aqueous chemistry, and photolysisImproved advective and turbulent transportMajor structural upgrades that improve flexibility and maintainabilityUpdates to WRF for CMAQ modeling Gilliam Talk Tuesday 830 AMMCIP4.0 is also being released The 2-way Coupled WRF-CMAQ system Rohit Mathur next talk Wong Talk Tuesday 850 AM, Yu Talk Tuesday 930 AMBi-directional surface flux for NH3 and Hg Jesse Bash next after RohitCooter Talk Tuesday 1020 AM, Jeong Talk Tuesday 1040 AM
3. CB05Updated toluene mechanism by Whitten et al. (2010)Impacts in urban areasppbVChanges in mean Max 8-hr O3(CB05-TU - CB05-Base) SAPR07TBFully updated organic and inorganic reactions consistent with current consensus knowledge on atmospheric kineticsAdditional explicit species that have either high emissions, high toxicity, or high SOA formation potential xylene, a-pinene, benzene, 1,3-butadiene, etc.Updates to both MechanismsSO2+OH rate constantMade N2O5 hydrolysis consistentCMAQv5.0 UpdatesGas-phase mechanismsSarwar et al GMD 2011
4. Upgrades to the In-line photolysis module:Read input data (e.g., quantum yield, cross section) from an ascii file (created by a pre-processor)Easier to update data or add new reactionsSurface albedo by wavelength and land-useTemporal and spatial (fractional land-use) variationsIncludes albedo for snow and seaice from WRFOzone column data from satellite (1978-present) for whole globeCMAQv5.0 UpdatesImproving Representation of PhotolysisHutzell and Streicher Talk Tuesday 140 PM
5. CMAQv5.0 UpdatesImproving Representation of PhotolysisAddressing winter-time O3 in theWestern statesReduction in bias in vicinity and downwindof source regionsAerosol Effects on Photolysis and simulated photochemistryDifference in max. 8-hr O3 biasppb
6. 6CMAQv5.0 UpdatesPM Treatment: Non-carbon organic massSummerJuly 2006Source-specific OM/OC ratios in primary emissions Simulate oxidation of primary OC → NCOMMuch better agreement with measurements at IMPROVE sites, especially in summerSimon et al 2011 ACPSimon and Bhave Poster
7. Linkage w/other CMAQ modules:Mg,K,Ca (for ISORROPIA v2.0)Fe,Mn (for AQCHEM)PM2.5 EmissionsPH2OPNAPCLPNH4PNCOMPALPCAPFEPSIPTIPMGPKPMNPMOTHRCMAQv5.0 UpdatesPM Treatment“Unspeciated” PM2.5: PMotherCool season: high-biasWarm season: low-bias Speciating PMother helps Characterize seasonal biasReff et al ES&T 2009
8. Aerosol ThermodynamicsISORROPIAv2.1Includes chemistry of additional crustal speciesUpdated sea-salt emission speciationIncludes code optimization to reduce computational time Bhave et al Talk Tuesday 12 PM Fugitive Dust EmissionsDevelopment and incorporation of a wind-blown dust algorithmCMAQv5.0 UpdatesPM TreatmentTong et al., JGR, submitted
9. Dry DepositionMosaic approachOutput dry deposition flux for the different land-use categories within a grid cellLinkage with ecological assessment studiesCMAQv5.0 UpdatesImpact of LNOx on NO3- wet depositionkg/ha; summer 2004Lightning NOxFour Options for lightning NOx emissionsNo lightning NOxNOx read from file created from NLDN dataNOx parameterized based on convective precipRead flash counts from user provided filePinder et al Poster
10. Aqueous ChemistryUpdated SO2 oxidation rates via H2O2, O3, MHP, PAA based on Jacobson, AE, 1997Updated SO2 oxidation rate via metal catalysis based on Martin and Good, AE, 1991Model now uses predicted Fe and Mn in catalyzed sulfur oxidation instead of prescribed background valuesChanges increase sulfate leading to small decrease in low biasSarwar et al Poster
11. Transport upgradesNew scheme for vertical advection More closely follows mass continuity calculations in WRFLess diffusion in upper layersAllows small deviations from mass conservationNew scheme for stable boundary layer in WRF and CMAQBetter simulation of nocturnal low level jetMore mixing after evening transitionLower minimum Kz to be more consistent with WRF
12. CMAQv5.0 UpdatesStructural ChangesName-list control fileControls processing of each speciesEliminates the numerous include filesEnables runtime changes in chemical species operationsEnables runtime factors for emissions and depostionAerosol module redesignEliminating dependencies and duplication across modulesEasier maintainenceFacilitates modifications
13. EvaluationUnit tests for each new feature of CMAQv5.0 have been evaluated for:2 weeks in November/December 2006 and July 2006 12 km CONUS domainCMAQv5.0beta was released in April to users/developers by request Full year (2006) operational and diagnostic evaluation is underway12 km CONUS domain Emission sensitivitiesAppel Talk Wednesday 830 AMFine scale (4 km) evaluation for TexAQS 2006 is underway Sarwar Poster, Godowitch poster, Kang Talk Wednesday 430 PM
14. New features of CMAQv5.0.1 (2012)Instrumented model capabilities – Sulfur tracking, DDM, primary carbon apportionmentCommunity contributions Yarwood Tuesday 1020Volatility Basis Set - CMU, EPRI, EnvironAdvanced Plume Treatment – EPRI, EnvironSOA modifications Pye PosterUpdate/add long-chain alkane yieldsAdd SOA from oxidation of polycyclic aromatic hydrocarbons (PAHs) Isoprene chemistry updateNew more advanced photolysis model Coming attractionsPM and Ozone source apportionmentRACM2 Updated Carbon Bond MechanismCMAQ adjoint
15. Global icosahedral met/chem with grid refinementCourtesy of Martin Otte