[MITgcm-support] difference between PH and PHL

[Jody Klymak]

Hi All,

On Aug 5, 2013, at  13:24 PM, Nicolas Grisouard <nicolas.grisouard at stanford.edu> wrote:

> I'm going to quote Jean-Michel, who answered this question when I asked it a couple of years ago (Jan. 7 2012 to be specific):
> 
> "From those output files, the pressure P can be obtained as:
> P(i,j,k)/rhoConst = -g*rC(k) + PH(i,j,k) + PNH(i,j,k) 

Except this isn't quite correct.  
> P(i,j,k)/rhoConst = -g*rC(k) + PH(i,j,k) + PNH(i,j,k) + PHref(k)
where PHref(k) is the hydrostatic pressure due to Tref and Sref.
see calc_phi_hyd.F and find_rho.F.  Unless I am grossly misunderstanding the code.
Thanks,   Jody



> 
> And PHL would be the equivalent of PH (hydrostatic pressure potential anomaly)
> but at the bottom, so that the hydrostatic pressure at the bottom Pb
> would be: Pb(i,j)/rhoConst = g*Depth(i,j) + PHL(i,j)
> 
> Cheers,
> Jean-Michel"
> 
> It's pretty useful, because you don't have to interpolate the hydrostatic pressure on the topography.
> Cheers,
> Nico.
> 
> On 05/08/13 06:12, Robert Nazarian wrote:
>> Hi,
>> 
>> I'm using the MITgcm internal wave code and analyzing the pressure perturbations. I noticed in the output directory that         there are PH and PHL files, which are both hydrostatic pressure files. Can someone elaborate on the difference between the two?
>> 
>> Thanks so much,
>> Rob
>> 
>> Robert Nazarian
>> Department of Atmospheric and Oceanic Sciences
>> Princeton University
>> rn2 at princeton.edu
>> 
>> 
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
> 
> 
> -- 
> Nicolas Grisouard - Postdoctoral Scholar
> Stanford School of Earth Sciences
> 473 via Ortega - room M11
> Stanford, CA 94305-4216
> Dept. fax: (+1) 650-498-5099 
> Office Skype ID: nicolas.grisouard
> http://nicolas.grisouard.free.fr
> http://www.mendeley.com/profiles/nicolas-grisouard/
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support

--
Jody Klymak    
http://web.uvic.ca/~jklymak/




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mitgcm.org/pipermail/mitgcm-support/attachments/20130805/20743531/attachment.htm>