[MITgcm-support] Diagnosed KPP diffusivities

[Martin Losch]

Hi Ruan,

these diagnostics include the full 3D KPP-diffusitivities including the “background”.

Second question: there’s also the non-local counter-gradient transport in KPP (KPPghatK)

There are useful diagnostics DFrE and DFrI (+suffix) for the vertica diffusive flux.

Martin

> On 13. Sep 2019, at 17:07, Ruan Xiaozhou <saberruan at hotmail.com> wrote:
> 
> Dear MITgcm users,
> 
> I diagnosed KPPdiffS and KPPdiffT in my model run and they look remarkably similar to my 3D diffusivity input field (except at the surface and a very thin layer near the bottom). I was wondering if these two fields are the total diffusivities used in the model or net contribution to the diffusivity from just the KPP package? Looking at the calcu_3d_diffusivity.F routine, it doesn’t seem like the KPP diffusivities are added to the input field (the code seems to output a new KappaRTr and thus overwrites the previous one). A related question is, if I only had KPP and the input diffusivity field, could I equate the total vertical heat/salt flux (explicit + implicit components) to the total diffusivity multiplied by the corresponding gradients? Thanks!
> 
> Best,
> Xiaozhou
> 
> --
> Xiaozhou Ruan
> Postdoctoral researcher
> Department of Earth, Atmospheric and Planetary Sciences
> Massachusetts Institute of Technology
> 54-1622
> Cambridge, MA  02139
> 
> email: xruan at mit.edu
> web:   http://www.mit.edu/~xruan
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