transport on potential density surfaces

[StephenGriffies]

For CMIP6, we need to diagnose horizontal transport on sigma2000. Are we ready to exercise the regridding routine to do this?

[adcroft]

Is this needed for monthly or just annual?

[adcroft]

Also, I'm going to use _rho2 suffix for the file names, unless that's been set by CMIP?

[StephenGriffies]

monthly is needed.

Name for the file names are not specified.

[StephenGriffies]

monthly is needed for all overturning transport diagnostics, including GM and submeso.

[adcroft]

We need to decide on range and resolution for density space diagnostics...

[StephenGriffies]

This is what we used in MOM5 for years, based on rho2000. It likely is sufficient for our OM4 simulations. The delta(rho) are evenly spaced into 80 layers.

&ocean_density_nml
potrho_min=1028.0
potrho_max=1038.0
layer_nk=80

[adcroft]

Actually, I was thinking about reducing it to fewer levels for the sake of space. This is monthly output.

…

-- Dr Alistair Adcroft (Alistair.Adcroft@noaa.gov) Princeton University Tel: (609) 987-5073 NOAA/GFDL, 201 Forrestal Road, Princeton, NJ 08540

On Tue, Sep 19, 2017 at 6:57 AM, Stephen Griffies ***@***.***> wrote: This is what we used in MOM5 for years, based on rho2000. It likely is sufficient for our OM4 simulations. The delta(rho) are evenly spaced into 80 layers. &ocean_density_nml potrho_min=1028.0 potrho_max=1038.0 layer_nk=80 — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#154 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFlo86MwIR38bHnfp63S2GTkzMV2ls5Kks5sj54fgaJpZM4PYId_> .

[StephenGriffies]

My concern with reducing the density classes is that we will miss the subtle issues related to deep overturning cells. To capture these cells with a uniform delta(rho) generally requires many layers. If you wish to test nonlinear delta(rho), that may be fruitful, but it will take some testing.

If archive space is an issue (when is it not), I would strongly prefer annual means for all of the overturning diagnostics, keeping no less than 80 delta(rho) bins. I do not think it wise to coarsen in density class space without testing.

[jkrasting]

@StephenGriffies, @adcroft - Is there any sample output that you can point me to for testing?