[cam-users] CGD Forums

[phpbb at cgd.ucar.edu]

Dear cam-users, 

As you requested, here is the latest digest of messages posted on CGD Forums forums. Please come and join the discussion!


<<  issues linking to the MPI library, http://bb.cgd.ucar.edu//viewtopic.php?t=30 >>

PosterjmccaaPostedTue Oct 19, 2004 2:36 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=91#91
Message: Cathy,
<br />
<br />It looks like your MPI library might have been built with a fortran compiler that is incompatible with the compiler you are using to compile CAM.  You can generally check the symbols in your mpi library by doing something like:
<br />
<br />nm $LIB_MPI/libmpich.a | grep mpi_bcast_
<br />
<br />This should yield:
<br />00000000 T mpi_bcast_
<br />
<br />If it doesn't, then:
<br />If it can't find  $LIB_MPI/libmpich.a, you haven't specified LIB_MPI correctly, or else mpi is not installed correctly.
<br />If it has a different number of underscores (most likely 2), you'll have to reconfigure mpi and reinstall it.
<br />If it finds the library, but not the symbol, then mpi is not built/installed correctly.
<br />
<br />If the symbol appears as above, then your problem is in the CAM configuration.  
<br />
<br />Jim

------------------------------

<<  radiation calculation, http://bb.cgd.ucar.edu//viewtopic.php?t=31 >>

PosterpjrPostedTue Oct 19, 2004 2:31 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=90#90
Message: You can achieve the results you want by modify tphysbc.F90  in the following way:
<br />
<br />find the lines that calls radctl.
<br />
<br />modify the call by replacing the string "cld" with the string "zero" 
<br />cld is an array containing  the real cloud fraction
<br />zero is an array filled with zeroes.
<br />
<br />Under these circumstances the radiation should not see any clouds.
<br />
<br />You can confirm that you have achieved the desired result by making a run and looking at the "cloud forcing" variables on the history files. These are called "SWCF" and "LWCF". If you got the correct result they will contain zero. If they are non-zero then you need to revisit the issue.
<br />
<br />Phil

------------------------------

<<  How to change geography and ice sheets?, http://bb.cgd.ucar.edu//viewtopic.php?t=34 >>

PostercmitasPostedWed Oct 20, 2004 2:05 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=93#93
Message: Hello,
<br />
<br />Which are the files that store the topography and the distribution of ice sheets?
<br />May one modify these to, for example, run CCSM for an idealized continent configuration, and various ice sheet configurations?
<br />
<br />Any guidance would be appreciated.
<br />
<br />Cheers,
<br />Chris

------------------------------

<<  Correctness of output datasets, http://bb.cgd.ucar.edu//viewtopic.php?t=33 >>

PosterjmccaaPostedTue Oct 19, 2004 4:37 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=92#92
Message: If you are running the standard model, you should get a climate that looks like the control simulation.  Climatology files for the control simulations can be found here:
<br />http://www.ccsm.ucar.edu/models/atm-cam/sims/cam3.0/
<br />
<br />To produce comparable climatological files from your own simulation, you'll need to run Mark Stevens analysis package.  You can learn more about that here:
<br />http://www.cgd.ucar.edu/cms/mstevens/diagnostics/
<br />
<br />Please note that you will not get exactly the same results due to differences among hardware and compiler versions.

------------------------------




Format TEXT
Show Message Text YES
Show My Messages YES
Digest Frequency DAY
Show only new messages since last time I logged in FALSE
Send empty digests NO
Time of day to send digest 9 AM
Maximum characters per message in digest 32000