[Mitgcm-support] about AIM
mitgcm-support at dev.mitgcm.org
mitgcm-support at dev.mitgcm.org
Wed Jul 9 15:43:09 EDT 2003
Hi,
I have few questions about AIM:
(Daniel, if you have some idea about the 1rst one ...Thanks)
1) Does any one remember why we set FWIND0 to .42 instead of
the value Franco use in his paper (=0.6)
It's set in INPHYS, line 118:
C
C--- 3. Constants for surface fluxes (common SFLCON):
C
FWIND0 = 0.6 _d 0
cchdbg *****************************************************
FWIND0 = 0.6 _d 0*0.7 _d 0
cchdbg ******************************************************
Since FWIND0 is use to compute the wind at the surface from
the wind at the 1rst level, and used after in the stress,
this can contribute to the strong surface wind we found in the
runs.
2) with full-cell and no Shapiro on Q, the global average of P-E
balance the surface correction term. The 2 are different by less
than 10^-4 mm/day.
3) Concerning Temperature, it does not work:
the same run with full-cell and no Shapiro on theta :
net heat flux (top) - (surface) = 0.9 W/m2 => warm the atmosphere
surface correction on Theta = 0.5 W/m2 => warm the atmosphere
latent heat due to exess P-E = 0.3 W/m2 => warm the atmosphere
My impression is that there is a problem in Heat conservation:
the dynamics conserves theta but the physics conserves the absolute
temperature:
If there is a radiative flux Fr from level 1 --> 2,
Cp*dT1 = -Fr ; Cp*dT2 = +Fr ==> T is conserved.
but
PI_1*dTheta_1= -Fr ; PI_2*dTheta_2 = +Fr ==> Theta is not conserved
because PI_1 & PI_2 are differents (PI = Cp*(p/Po)**kappa)
And since the dynamics advects theta, only theta can be conserved,
its my impression.
4) for Chris: to put partial cell in AIM, can I start with the code in
the repository or would be better to use the coupled version ?
Jean-Michel
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