[ncl-talk] Potential Vorticity terms

[Dennis Shea]

Sometime ago, I  created a test diabatic heating function. I  can not
remember why I did not make it public. Possibly because doing so required
extensive testing, writing documentation and support. My guess is that I
just did not have the time.  Sorry about that!
======
See:  *https://www.ncl.ucar.edu/Applications/wind.shtml*
<https://www.ncl.ucar.edu/Applications/wind.shtml>

  Q1Q2_yanai.ncl
<https://www.ncl.ucar.edu/Applications/Scripts/Q1Q2_yanai_1.ncl>

Read the text for this example.  The 'Q1' term represents the total
diabatic heating.
*Maybe* this will be helpful.    Sorry, I can not offer more support.
----
Also: see Walter Hannah's page: "*A Comparison of Methods for Estimating
Diabatic Heating*"

*http://hannahlab.org/a-comparison-of-methods-for-estimating-diabatic-heating/*
<http://hannahlab.org/a-comparison-of-methods-for-estimating-diabatic-heating/>

He used NCL scripts. I am not sure if these are still available.

=======================

Good Luck


On Thu, Apr 28, 2022 at 10:23 AM Lyndz via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear NCL-experts,
>
> I saw this function/tutorial for calculating the Potential vorticity from
> the NCL webpage.
>
>
> https://www.ncl.ucar.edu/Applications/pot_vort.shtml#:~:text=There%20are%20two%20potential%20vorticity,static%20stability%20and%20potential%20temperature
> .
>
> I would like to compute for the Potential Vorticity Tendency (PVT) on an
> isobaric level and global rectilinear grid reanalysis.
>
> According to the attached file, PVT can be decomposed into
> PVT= B* [ horizontal Advection + vertical advection + diabatic heating +
> friction ]
>
> I can compute for the horizontal advection using this:
> https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml
>
> My problem is how to calculate the diabatic heating here. Any suggestions
> on how I can do this in NCL?
>
> -Lyndz
>
>
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