[MITgcm-support] What is the unit of PH and PNH in the output files?

[Jody Klymak]

And, to make things confusing, for the linear equation of state:

P_k = (PhiHyd*rhoconst + sum(rho0*dc*g))
where rho0 is rhoconst+rhoRef(k), and rhoRef(k) is set by Tref and Sref.  This doesn't seem consistent with the other equations fo state, but a lot of internal wave folks use linear equation of state, so its something to bear in mind.  However, this term has no physical dynamics either, so, can be dropped.

See the thread "difference between PH and PHL" from Aug 2013.

Cheers,  Jody

On Nov 20, 2013, at  23:44 PM, Martin Losch <Martin.Losch at awi.de> wrote:

> May I add that according to "available_diagnostics.log" (a useful list that you get when you turn on the diagnostics package):
>    XX |PHIHYD  | XX |       |SMR     MR|m^2/s^2         |Hydrostatic Pressure Pot.(p/rho) Anomaly
> 
> Here, "Anomaly" means that the constant contribution of gravity*abs(RC) is missing from PH and PHL (diagnostics names are PHIHYD and PHIBOT). That's another reason, why the values of PH may appear low. So to get the full pressure you need to do this:
> 
> P = (PHIHYD + gravity*abs(RC))*rho_const
> 
> although the second contribution is dynamically not relevant.
> 
> Martin
> 
> On Nov 21, 2013, at 1:08 AM, Jody Klymak <jklymak at uvic.ca> wrote:
> 
>> Hi Par,
>> 
>> Its P/rhoconst, to the units are m^2/s^2.
>> 
>> Cheers,   Jody
>> 
>> 
>> 
>> 
>> On Nov 20, 2013, at  13:01 PM, Pär Jansson <jansson.par at telia.com> wrote:
>> 
>>> Hi there!
>>> Sorry for asking such a trivial question, but I've scoured the manual, the online documentation and the support mails.
>>> Nowhere did i find the answer to my question;
>>> 
>>> What are the units of the pressure (PH and PNH) in the output fields from the model?
>>> I'm trying to evaluate the energy flux contents in internal waves etc. for my masters' thesis and 
>>> was assuming the output would be SI-units. That would mean Pascal (N/m^2), but they seem too small.
>>> In the variable list, some variables has the pressure in db and some are in Pascal. So I'm still confused...
>>> 
>>> 
>>> Best regards!
>>> /Pär Jansson
>>> University of Gothenburg
>>> 
>>> 
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>> 
>> --
>> Jody Klymak    
>> http://web.uvic.ca/~jklymak/
>> 
>> 
>> 
>> 
>> 
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> 
> 
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--
Jody Klymak    
http://web.uvic.ca/~jklymak/