[MITgcm-support] abundance of water vapor in Fizhi package

[Yuan Lian]

Hi, Andrea,

Thank you very much for your help. I will follow your instructions to 
run my model. The scattering is not necessary for my model so I think it 
should be safe to zero out the values of gases on the way into the 
shortwave. Thanks again!

Cheers,
Yuan

Andrea Molod wrote:

> hi yuan,
>
> there is a 'verification experiment' which uses fizhi in an
> atmospheric model with no topography or land. that may be a good
> place for you to start.
>
> the values of the tracers that are sent to the shortwave and longwave 
> radiation codes are set in routine fizhi_init_chem (for the ones that are
> constant in time) and in update_chemistry_exports (for the ones
> that vary in time, like ozone and stratospheric water vapor).
>
> just a reminder, though - if you change these values you are changing
> them for the longwave and shortwave radiation routines. an alternative
> for you to change the values for the shortwave alone would be to get
> into the shortwave calling routine (in fizhi_swrad.F)
> and change the values just before the call to subroutine sorad.
>
> one other point here -- by 'zeroing out' the values of the gases on the
> way into the shortwave you also remove the scattering, not only the 
> absorbtion. if you really want to remove the absorbtion only, you will
> have to put your hands inside routine solir and soluv.
>
> the water vapor is computed as a model prognostic field, but again
> you can zero it out on the way into the shortwave code or on the
> way into routines solir and soluv.
>
> good luck!
>
> ----------------------------------------------------------------
> Andrea M. Molod, PhD.
> Department of Earth, Atmospheric & Planetary Sciences
> MIT
> Tel: (617) 253-5458, Email: amolod at mit.edu
> WWW:http://paoc.mit.edu/paoc/people/person.asp?position=Postdoc&who=molod
> ----------------------------------------------------------------
>
>
> On Tue, 25 Jul 2006, Yuan Lian wrote:
>
>> Hi,
>>
>> I am trying to run a atmopsheric model which will include 
>> condensation of water vapor. I think I am going to use fizhi package. 
>> My model will be very simple: no topograhy, no absorption of solar 
>> radiation by water vapor and other tracer gases, latent heat released 
>> by water vapor will only heat up hydrogen which the atmopshere is 
>> composed of. Could anyone please tell me where to define the 
>> abundance of water vapor and type of gas in atmosphere in fizhi 
>> package? Thanks a lot!
>>
>> Cheers,
>> Yuan
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