[MITgcm-support] potential density

[Matthew Mazloff]

Hi Bruno,

Not sure about (U,V,W)RHOMASS -- I would assume those are the  
transport of in situ density since the model uses in situ density.

Derivatives of density (e.g. drhodz) are computed with a local  
reference pressure -- so they are the gradient of potential (or  
neutral) density. Therefore I believe sigmax and sigmay are the  
gradients of pot. density.

-Matt



On Mar 22, 2011, at 6:20 AM, Bruno Deremble wrote:

> Good morning,
>
> In do_oceanic_phys, are sigmax and sigmay the gradients of potential  
> density (as stated in the manual in the gmredi section)? I ask this  
> because they are computed using 'rhoinsitu' which I presume is the  
> in situ density and not the potential density.
>
> in the diagnostic package WRHOMASS is associated to Vertical  
> Transport of Potential Density whereas URHOMASS and VRHOMASS are the  
> horizontal transport of density. Is it correct in both cases?
>
> thank you
> bruno
>
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