MM5 Modeling System Version 3
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MM5 Model Version 3 : Release emails to users
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Dear MM5 users,
This email announces the release 3-7 of MM5 model Version 3.
The MM5 modeling system will be FROZEN with this release. We will
continue to maintain the code and fix bugs, but from now there will
be no new development for the MM5 modeling system programs.
MM5 and MPP source code tar files are updated on anonymous ftp
site,
NCAR's MSS, and IBM-accessible disk since December 23, 2004.
For information on where to obtain the 3-7 source code, please see
http://www2.mmm.ucar.edu/mm5/mm5v3.html
The highlights of the 3-7 release include:
1. The polar physics (IPOLAR=1) has been added to the MRF PBL
scheme. (Previously only the Eta PBL scheme
could be run when
IPOLAR was set to 1).
2. Add horizontal diffusion modifications to the code. This allows
for
diffusion to be calculated truly horizontal.
This option is turned on by setting ITPDIFF to 2.
3. Solar slope and topography shadowing effects are included with
two new switches, LEVSLP and OROSHAW.
LEVSLP indicates the nest level at which solar radiation start
accounting for orography. (This will correspond to LEVIDN).
This is only recommended for very high resolution model runs.
To switch this off, set LEVSLP equals to a large number like 9.
OROSHAW include the effect of orography shadowing. This only has
an effect if LEVSLP is also set. OROSHAW is NOT included in
the MPP version of the code.
4. The Noah LSM now has urban effect, and considers emissivity
in
computing surface temperature. The second change generally
increases the amplitude of the diurnal cycle. Note, one must
use the modified LANDUSE.TBL as well.
5. Optimized routines to ensure faster run times. The new routines
especially improve run times on IBM computers. In order to give
users a choice, both the optimized and original code are available.
6. New Cray X1 and INTEL compiler flags are added.
The detailed changes are described in the CHANGES file in the
top directory. The new tar file can be obtained from several locations,
including NCAR's MSS and anonymous ftp. The detailed changes are
provided in Diff/diff.23DEC04 inside the tar file.
We would like to take the opportunity to thank all our users and
developers
for the contributions over the years.
Happy Holidays and a wonderful 2005.
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