[MITgcm-support] Bulk Force and SSS restoring

[Martin Losch]

Hi Amato,

in data.cal you can specify the 'model calendar' (see global_with_exf for an example), so that should not stop you from use exf instead of bulk_force. Although my experience with bulk_force is very limited, the exf does have quite a few options, and I think it should do what you need. 

Did you have a look at global_ocean.cs32x15/input.thsice/ for an example use of bulk_force?

Martin
On Feb 17, 2010, at 3:58 PM, Amato Evan wrote:

> Hi Stefano!
> 
> I was hoping to use the model calendar (just b/c it's more straightforward) and as far as I can tell, if one uses EXF then calendar has to be set to "Gregorian". Is this right?
> 
> I should say that another reason for only restoring to SSS is that this is how I have spun up the model, so I'd like to stay consistent on this front as well.
> 
> Thanks for your time, I really appreciate it!
> 
> Sincerely,
> Amato
> 
> On Feb 17, 2010, at 4:37 AM, Stefano Querin wrote:
> 
>> Hi Amato,
>> 
>> just a few ideas...
>> 
>> Have you ever tried to use the EXF package for your simulations? It
>> should be more complete and flexible than the BULK_FORCE package. You
>> can also restore SSS to prescribed values with it.
>> 
>> I don't think that the computation of freshwater fluxes using runoff
>> and precipitation input files makes the model run that slow... (but
>> I'm just relying on my experience, I never made any test regarding
>> this). On the contrary, if you meant that the creation and handling
>> (offline) of runoff and precip files is somehow cumbersome and slow,
>> then SSS restoring should be a more desirable choice.
>> 
>> Anyway, the EXF package has many available options.
>> 
>> Hope this helps...
>> 
>> Cheers!
>> 
>> S.
>> 
>> 
>> 
>> On 16 Feb 2010, at 19:50:23, Amato Evan wrote:
>> 
>>> Hello Everyone,
>>> 
>>> I am trying to estimate the effect of surface forcing by volcanic-
>>> aerosols on tropical SST. To do this I have a 1x1 degree model setup
>>> w/23 vertical levels. After spining up the model for 130 years using
>>> NCEP and WOA data (and SSS restoring), I would like to "turn-on" the
>>> BULK_FORCE package in order to change downward lw & sw fluxes in
>>> accordance with volcanic aerosol surface forcing (something I
>>> calculate offline w/satellite obs. and an RT model).
>>> 
>>> I am giving the BULK_FORCE pkg wind stress values (calcWindStress
>>> = .FALSE.), but I would like to run w/surface salinity restoring,
>>> and not have the model calculate freshwater fluxes using runoff and
>>> precip input files. My motivation is just to make the model runs
>>> complete more quickly. What I can't determine from the documentation
>>> and source code is if I leave:
>>> 
>>> RainFile= ' ',
>>> RunoffFile= ' ',
>>> EmPFile= ' ',
>>> 
>>> in data.blk, will bulk_force just restore to surface salinity on the
>>> time scales I define in "data"? If anyone has experience with this,
>>> I would really appreciate input. Also, the contents of build/,
>>> code/, and input/ for my setup can be found here:
>>> 
>>> http://trane.evsc.virginia.edu/mitgcm/
>>> 
>>> If anyone is so inclined to look them over.
>>> 
>>> Thanks!
>>> 
>>> Sincerely,
>>> Amato
>>> 
>>> ---
>>> Amato Evan
>>> Asst. Professor
>>> Dept. of Environmental Sciences
>>> University of Virginia
>>> 434.243.7711
>>> aevan at virginia.edu
>>> http://trane.evsc.virginia.edu
>>> 
>>> 
>>> _______________________________________________
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>> 
>> 
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> 
> ---
> Amato Evan
> Asst. Professor
> Dept. of Environmental Sciences
> University of Virginia
> 434.243.7711
> aevan at virginia.edu
> http://trane.evsc.virginia.edu
> 
> 
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