[cam-users] heating experiment

[Jeffrey Yin]

Hello JYMoon and all,

I have some code that specifies the moist heating in CCM3, rather than
allowing the model to calculate it itself, which I think will be helpful
in the experiments you are planning.  One version, for CCM3.6, reads in a
climatology of the moist heating (DTCOND) and interpolates between
monthly means, as is done for prescribed SST; another version, for
CCM3.10, calculates moist heating as a function of harmonics of the annual
cycle, which may be more what you're interested in if you are looking at
intraseasonal variations in tropical convection.  Once the specified moist
heating is calculated, it just needs to be inserted in the place of the
model's moist heating in subroutine physics/aphys.F.  You can also read in
a mask which tells the model to specify the moist heating only at certain
latitudes or in certain regions (thanks to Joe Barsugli for adding this
feature!).

To work with this code, you need to specify the moist heating (DTCOND) at
each gridpoint and model level, so you'll need to come up with a vertical
structure and spatial structure for your heating, and how it will
propagate in time.  Our experiments show that specifying moist heating
everywhere in the tropics produces a reasonable climatology, since most of
the heating is balanced by vertical motion, and it would be interesting to
see what happens when you add intraseasonal variability to the climatology
of tropical moist heating.

In any case, let me know if you would like to have my code, and I would be
happy to send it to you.

Cheers,
Jeff

Jeff Yin
NOAA-CIRES Climate Diagnostics Center
R/CDC1                                 Phone: 303-497-6175
325 Broadway                           Fax:   303-497-6449
Boulder, CO 80305-3328                 Email: Jeffrey.Yin@noaa.gov

On Thu, 6 Nov 2003, Ja-Yeon Moon wrote:

> Hello,
>
> I'd like to know whether the intraseasonal tropical convection have coherent structure with midlatitude circulation.
> To have some experiment using idelized heating(total heating at the top of atm) in intraseasonal time scale, how should I change the code in CCM3 ?
> If you have some experience, could you advice me which subroutine to check ?
>
> Thank-you in advance.
>
> Sincerely ,
> JYMoon