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What Were We Supposed to Have Done in CAM4 with Chemistry?

Explore the comprehensive updates and improvements in the Chemistry model of Community Climate System Model (CCSM) including aerosol schemes, chemical mechanisms, photolysis, emissions, washout processes, and data assimilation capabilities.

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What Were We Supposed to Have Done in CAM4 with Chemistry?

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  1. What Were We Supposed to Have Done in CAM4 with Chemistry? Who will do what?

  2. My View of Priority Items

  3. Chemistry model in CCSM • MOZART4 Incorporated into CCSM • CAM and MOZART routines checked against each other • Chemical Mechanism • MZ4 mechanism in place. • Simple input of fixed chemical oxidants • Query functions so chemical mechanism easy to change. • Additions to mechanism for SOA formation (Heald) DONE • Dry deposition • Wesley deposition in place (MZ4) • Wesley deposition input into CLM DONE • Updated scheme using information from CLM (LAI, stomatal resistance) HP • Photolysis • Fast TUV in place • Update to Prather Fast-J HP • Use of sophisticated cloud overlap (Neu) HP • Consistency between CAM and CHEM in treatment of aerosols HP

  4. Chemistry in CCSM continued • Emissions • MEGAN emissions algorithm for isoprene/monoterpene in CLM • Update for other biogenic emissions • Interactive injection height for biomass burning emissions • Washout (gas) • Giorgi and Chameides (both large-scale and convective) • Update to more physically based scheme with realistic cloud overlap HP • Include explicit washout within convective scheme HP • Washout (aerosol) • Updated to Rasch scheme • Impact and nucleation scavenging (Ghan, in development) HP (Consistency between Indirect Effect and Aerosols)

  5. Chemistry model in CCSM continued • Aerosols • MOZART4 bulk aerosol scheme w/ NH4NO3 • Interactive Sea-salt and Dust (Mahowald) • Aerosol-Radiation coupling • Ability to use sulfate scheme with input oxidants • Coupling to cloud microphysics (Gettleman) In Progress • Internally mixed 4 or 7 mode scheme (Ghan, Liu) HP • Upper Boundary Conditions • Stratospheric concentrations specified • Synoz • Stratospheric Chemistry in CAM (Lamarque) Done

  6. Chemistry model in CCSM continued • Online/Offline capability • Aerosol-Radiation coupling • Extension of offline model to WACCM • Evolution of lower part of model from analyzed winds • Evolution of upper part of model computed dynamically • Data assimilation capabilities • Ensemble Kalman Filter Meteorological/Chemical data assimilation • Coupling to CLM/Ocean models • Nitrogen coupling to the C cycle • Biomass burning algorithm • DMS and other ocean emissions • CH4 emissions • Ozone/Acid rain and the biosphere • Downscaling and coupling with WRF-chem

  7. Priorities • Photolysis scheme • Dry deposition • Washout • Aerosols

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