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MM5 Modeling System Version 2

MM5 Model Version 2: Release emails to users


V2-12
Updated

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MM5 Version 2 Release 2-12 (April 3 1999)


Dear MM5 (V2) users,

This email is regarding the MM5 V2 model's newest release: release-2-12.

The highlights of this release include:

  1. A way of allowing the model to handle different number of landuse categories, and allowing a user to change land surface properties is implemented. The change prepares the model to handle new landuse data sources in the upcoming release of new terrain program which will process 24-category USGS and 16-category SiB datasets. Please read the CHANGES file for detail, and stay tuned for mesouser email on the new terrain program release next week.

  2. A new microphysics scheme, called the Schultz scheme (Schutlz 1995), is implemented in this release. This scheme predicts cloud water/ice, rain water/snow and graupel (or hail).

  3. The MM5 code can now deal with 8-digit MDATE in year 2000 and later, including runs across the millennium. However the 4DDA code is not yet year-2000 compliant.

  4. Reisner II scheme (graupel version) is again revised extensively. The scheme should still be considered experimental and may subject to futher changes in later releases.

The detailed changes are described in the CHANGES file in the top directory of the new tar file. The new tar file can be obtained from several locations, including NCAR's MSS and anonymous ftp.

The CHANGES file separates changes into bug fixes/modification (which you definitely want to include in your files), new features and changes (for which you can make a decision as whether you include them in your copy of the code). In addition to this description, the actual changes are provided in a diff file: diff.03APR99, in directory ReleaseNotes/.
A user should have enough information from these two files to make corresponding changes to your own files.

If you don't want to get a new tar file, files CHANGES, and diff.03APR99 can be found from anonymous ftp under /mesouser/MM5V2/MM5, and on paiute/ouray/chipeta under
~mesouser/MM5V2/MM5. They are also accessible from the Web site:

     http://www2.mmm.ucar.edu/mm5/mm5v2/mm5v2-changes-r2-12.html

*** Note: IF YOU HAVE NOT MADE ANY CHANGES TO YOUR TAR FILE (including file structure and source code), YOU SHOULD GET A NEW TAR FILE.

### Note also that the new Schultz microphysics scheme, and the revised Reisner II scheme, exmoisg.F, new include files, landuse.tbl file do not appear in the diff file. It is in the tar file.

If you use NCAR's Cray, the default tar file you get from MSS will be changed to release-2-12 as of the evening of Apr 03 1999, MST.
If you would like to use any previous releases, you can change the MSS read statement in the mm5.deck from

     msread mm5v2.tar /MESOUSER/MM5V2/MM5/MM5V2.TAR
to
     msread mm5v2.tar /MESOUSER/MM5V2/MM5/MM5V2.TAR.release-2-11

and so on.

If you are an MPP code user, please obtain a new MPP tar file.

 

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