RELEASE NOTES 28 July 2003

Slight modifications were made to the CCTM scripts run.cctm and in_out.q for compatibility
with MCIPv2.2. The lines in the file in_out.q that check for the GRID_BDY_2D
and the MET_BDY_2D files were commented out as these files are no longer
created by MCIP.  Also the lines in the file run.cctm that set the environment variables for
these two met files were also removed. These files are not needed to run the CCTM under 
normal conditions.

                 RELEASE_NOTES  8 May 2003

  The major changes and new features of this release are:

  1) Scripts to build and run CMAQ for MPICH Linux clusters

  2) Incorporation of the I/O API Version 2.2

  3) Some enhancements and bug fixes:
     + Modifications of the vertical diffusion module were made to improve
       data locality to speed up computation.
     + A bug was fixed for the case where a user would build a model for no
       aerosols.
     + Changes were made to improve robustness for inexact I/O API (netCDF)
       file header data.
     + Some codes were modified to correct Fortran compiler errors with some
       vendors.
     + For the heterogeneous N2O5 reaction in the aerosol module, an error was
       corrected in the concentation units for calculating the HNO3 yield.
       Also, the rate constant calculation for this reaction has been changed
       to use effective radius instead of diameter.
     + An error in the contribution of N2O5 to total initial HNO3 has been
       corrected in the cloud module. Also, the MAX function was changed to MIN
       to correct a bug in the calculation of TOTFRAC.

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                 RELEASE_NOTES  9 July 2002

  The major changes and new features of this release are:

  1) A new aerosols module, aero3, that includes:
     + improved treatment for Secondary Organic Aerosol formation by including
       semivolatile compounds that partition between gas and aerosol phases,
     + updated process for Sulfate nucleation,
     + heterogeneous conversion of N2O5 to Nitric Acid,
     + incorporate the ISORROPIA model for thermodynamics.

  2) Incorporate aerosol emissions in the vertical diffusion process.

  3) Change the order of the time splitting science processes:
        from chemistry -> clouds -> aerosols
          to clouds -> chemistry -> aerosols
     to provide a better linkage between gas-phase chemistry and aerosols.

  4) Add the Saprc99 gas-phase mechanism and all CMAQ variants.

  5) Add Modified Euler Backward Iterative (MEBI) solvers for all variants
     of CB4, SAPRC99, and the RADM2-Carter-4-Product-Isoprene mechanisms.

  6) Add a new vertical diffusion module, the Asymmetric Convective Model (ACM).

  7) Change to a dynamic allocation of the horizontal grid for the chemistry
     model (CCTM) and the initial and boundary concentrations pre-processors
     (ICON and BCON). This allows one executable to run any horizontal
     domain that CMAQ supports.

  8) In conjunction with (7), CCTM now can window from meteorology and
     emissions datasets, so that runs on many subdomains can be executed using
     one dataset that encompasses all those subdomains.

  9) Addition of hour-averaging output option for any chemical species.