Date: Wed, 31 Jan 1996 16:16:27 -0700 (MST)
From: zly@stratus.atmo.Arizona.EDU (Zong-Liang Yang)
Subject: standard ccm2 climatology
To: ccm-users@ncar.ucar.edu
Greetings CCM2 users.
Our local version of CCM2 was first implemented on
the Department's IBM RS 6000 machine called STRATUS.
Previously, only short simulations were performed on
STRATUS, which is adequate for students or postdocs
to get trained.
Now we wanted to use the local CCM2 for vigorous
research and publications, so we thought that there
is a need to produce a `benchmark' simulation which
is sufficiently long, say 10 years, to compare with
the standard archives in NCAR.
Two benefits can be gained from doing so,
1) We can claim the implementation of CCM2 on our
local machines is satisfactory, and
2) We will have a standard control simulation to
compare with our `anomaly' runs, say, changes in
convection or cloud schemes, etc.
We cannot compare these anomaly runs performed on
our local machine with the control obtained from the
NCAR archives which were produced from Cray-YMP
because a) the computation accuracy changes from machine
to machine and b) our FFT and the related library are
different from those in NCAR (we do not have the FFT
licence from ECMWF).
We had compared 1-year simulation on our STRATUS
with the corresponding year from NCAR's Cray-YMP,
and noticed that differences do exist.
Before we start the 10-year run, we would like to hear
from other CCM2 users if some one has done such a comparison
before. This may not be necessarily on IBM RS 6000.
We are interested to know whether the differences are negligible
or considerable, and how to make the differences negligible
(e.g., special attention to compiler options).
Other good suggestions are also welcome.
Thank you in advance.
Liang
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Zong-Liang Yang __
Institute of Atmospheric Physics __ | |
PAS Building #81 | | | |
The University of Arizona | | | |
Tucson AZ 85721 | |_| |
USA \___ | __
| | | |
Phone: +1 520 621 6619 (am) | |_| |
Phone: +1 520 621 6619 (pm) | ___/
Fax: +1 520 621 6833 | |
E-mail: zly@frost.atmo.arizona.edu | |
| |
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