[MITgcm-support] ptracers diffusivity

[Martin Losch]

Samar,
as far as I can see, PTRACERS_useGMRedi is not used so far, and the 
isopycnal diffusivities are those from salinity and temperature (?), 
PTRACERS_diffKh is the equivalent to diffKhT and diffKhS. Hope that 
this is not too wrong.

Martin
On Jul 31, 2004, at 5:28 AM, samar khatiwala wrote:

> Hello
>
> Could someone please clarify how PTRACERS_diffKh interacts
> with GM/REDI?
>
> Suppose I have:
>  PTRACERS_diffKh(1)=0.E3,
>  PTRACERS_useGMRedi(1)=.TRUE.
>
> Will the Redi part of GMREDI (isopycnal diffusion) be applied to this
> ptracer? If so, what diffusivity will be used (I'm guessing
> GM_background_K etc)?
>
> On the other hand, what happens if I have:
>  PTRACERS_diffKh(1)=1.E3,
>  PTRACERS_useGMRedi(1)=.TRUE.
> (and useGMRedi=.TRUE.)
> Will horizontal diffusion AND Redi isopycnal diffusion both be
> applied?
>
> I cannot figure out what PTRACERS_useGMRedi does.
>
> Thanks very much
> Samar
>
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