*New OBLdepth calculation based on POP approach. Ans changes*

[StephenGriffies]

Modifications to the OBLdepth calculation based now on what
is done by POP. New results found to be insensitive to the
"correction" step, since the first pass now properly accounts
for the thickness of the surface layer. This new approach
changes answers, but not by much. New algorithm is
faster (since no need to perform the correction step) and
easier to understand.

These changes need to be tested in all expts that use KPP.

[adcroft]

The Bulk Richardson number is part of KPP because the definition is unique to Large et al. We've always had Bulk Ri in the MOM_KPP module. What @StephenGriffies has done is fix the first guess for the average within the surface layer.

[MJHarrison-GFDL]

I understand. Its only relevant to kpp expts and only affects first guess.
Just pointing out that we in principle should be calculating things like N2
or S2 identically across MOM6 code. Right?

On Thursday, February 5, 2015, Alistair Adcroft (GFDL) <
notifications@github.com> wrote:

The Bulk Richardson number is part of KPP because the definition is
unique to Large et al. We've always had Bulk Ri in the MOM_KPP module. What
@StephenGriffies has done is fix the first guess for the average within the
surface layer.

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[StephenGriffies]

Hi,

Agree we should do things consistently across MOM6. Is there a common N2
calculation routine now in MOM6? If so, then we can make use of it. If
not, then let's add that to the task list.

Steve

On Thu, Feb 5, 2015 at 7:09 PM, Matthew Harrison notifications@github.com
wrote:

I understand. Its only relevant to kpp expts and only affects first guess.
Just pointing out that we in principle should be calculating things like N2
or S2 identically across MOM6 code. Right?

On Thursday, February 5, 2015, Alistair Adcroft (GFDL) <

notifications@github.com> wrote:

The Bulk Richardson number is part of KPP because the definition is
unique to Large et al. We've always had Bulk Ri in the MOM_KPP module. What
@StephenGriffies has done is fix the first guess for the average within the
surface layer.

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Dr. Stephen M. Griffies
NOAA Geophysical Fluid Dynamics Lab
201 Forrestal Road
Princeton, NJ 08542
USA