[cam-users] Hemispheric asymmetries: addendum

[Camille Li]

Regarding the following message, which I just posted,
I forgot to mention that I do not call the LSM at all
in order to get rid of Antarctica.

---------- Forwarded message ----------
Date: Wed, 24 Jul 2002 18:28:29 -0700 (PDT)
From: Camille Li <camille@atmos.washington.edu>
To: cam-users@ucar.edu
Subject: Hemispheric asymmetries


I am trying to set up the CCM3.6 with the SOM to run in a land-free
configuration (ORO and SGH = zero everywhere), and the sea ice keeps
disappearing in the Southern hemisphere.

I've changed the orbital parameters and ozone datasets to be "symmetric"
about the annual cycle (i.e., NH January looks like SH July etc.), I have
a QO that is symmetric about the equator with no annual cycle, and my
initial temperature (all levels and subsurface levels) and u and v (all
levels) fields are symmetric about the equator.  Given all this, the
difference in sea ice concentration between the two hemispheres is
apparent within the first few months.

I read in the documentation that diffusion coeffiecents are tuned to give
realistic polar night jets, but cannot find where this is in the code.
Is this my problem?  Is there anything else I haven't considered, or is
there some other hemispheric asymmetry that is hardwired into the model?

Thanks,
Camille Li