RELEASE_NOTES for CMAQv4.7 - 30 September 2008 The changes and new features of this release are: 1) Aerosols - SOA Model Enhancements + Updates: isoprene SOA, sesquiterpene SOA, polymerization, acid- catalyzed SOA, NOx-dependent SOA yields, and enthalpy of vaporization + In-cloud SOA formation pathways (glyoxal, methylglyoxal) + Changes in gas-phase chemistry mechanism, emissions speciation, and biogenic emmissions model, to represent SOA precursors - Coarse PM + Semi-volatile inorganic components (NO3-, Cl-, and NH4+) can condense and evaporate from the coarse mode, via dynamic mass transfer + Nonvolatile sulfate can condense on the coarse mode + Variable standard deviation of coarse mode size distribution + Emissions of sea salt from the surf zone - Heterogeneous reaction probability + Re-derived parameterization based on Davis et al. (2008) 2) Chemistry - HONO enhancements + Heterogeneous reaction on aerosol and ground surfaces + Emissions from mobile sources - Photolysis Options (beta versions) + In-line photolysis rate module, with aerosol feedback + Photolysis rates adjusted using satellite-derived cloud information (currently table-approach only) - Aqueous Chemistry + Added two organic oxidation reactions (glyoxal, methylglyoxal) + Updates to Henry's Law constants based on literature review - Base CB05 mechanism with Cl2 chemistry - Multi-pollutant Capability + Include HAPs and Hg in single modeling platform 3) In-line options - Dry Deposition + Moved calculation into CCTM - Emissions + Integrated BEIS into CCTM + Incorporated Plume-rise into CCTM - Bi-directional NH3 and Hg surface flux + for NH3, fertilizer emissions will be applied through the flux model (under development) 4) Emissions - Biogenic emissions: added sesquiterpene emissions - Sea-salt emissions + Updated flux parameterizations & surf zone emissions + Used spatial allocator to produce ocean file - Speciation changes for HONO and benzene 5) Clouds - Convective cloud model + Revised to reduce layer configuration differences + Changed the integration timestep - Resolved cloud model + Correction in precipitation flux calculation 6) Diagnostic Tools (will be released during FY09) - Direct Decoupled Method (DDM) - Primary carbon source apportionment model - Sulfate tracking model 7) Model options no longer supported: - Plume-in-grid - CB4 mechanisms - Aero3 module and AE3 mechanisms - RADM cloud module - Stand-alone mercury version of CMAQ (capability is included in the multipollutant version)