Subject: New CCM3 tar file
Date: Tue Aug 04 1998 - 15:54:42 MDT
New CCM3.6 tar file:
This message should be of interest only to those using CCM3.6 at
resolutions other than T42, or to those who wish to build the code on a
PC running LINUX, or who wish to use the Slab Ocean Model (SOM).
A new tar file of CCM3 code, ccm3.6.6.tar.gz, is now available on NCAR's
anonymous ftp site (ftp.ucar.edu). Changes vs. CCM3.6 are as follows:
- A bug was found in the spectral filter which is applied (subroutine SPETRU)
when initial dataset field PHIS was defined from a high-resolution topography
file. This would be true if the initial dataset has been run through the code
in ccm/tools/definesurf). Since the initial dataset (T42 truncation)
provided with the distribution was not run through definesurf, users should
not encounter the bug unless they are running definesurf themselves.
- The code which builds SGH, PHIS, and ORO from a high-resolution topography
file (definesurf/) was inadvertently missing a subroutine (endrun.F90) in the
CCM3.6 distribution. This routine has been added in the new tar file.
- Code and Makefile mods were added to enable the CCM to be run on a PC
running LINUX. Though the new cpp token is named LINUX, it is implicitly
assumed that the compiler is pgf77 (Portland Group f77). CCM3.6 is not yet
officially supported in this configuration, but the mods are provided to
those who would like to make use of them. Initial tests show that the model
is producing correct results as compared with supported platforms.
- The SOM code was added back into the distribution. CCM3.6 with SOM
was tested on the Sun and Cray platforms, and it was verified that SPMD
gives bit-for-bit results with non-SPMD when running under SOM. However,
we have NOT run a climate simulation with SOM, and are not providing
data-sets for SOM use with CCM3.6. And as we have not run a SOM climate
simulation ourselves, we simply do not know if the climate simulation
of CCM3.6 with SOM is reasonable.
For runs which do not involve the spectral filter mentioned above, the new
code produces an identical simulation to that of CCM3.6 on all the supported
IEEE platforms (SGI, SUN). Unfortunately, the Cray simulation only matches
to machine roundoff.
CCM Core Group
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