[ncl-talk] Computing the level of free convection, equilibrium level etc. for CAPE

[Sai Prasanth]

Dave,
Thank you for pointing to this discussion. It's informative for sure - but
doesn't answer my basic questions. If I am unable to derive this
information from the code, I'll post it on this forum.

Thank you,
P.

On Thu, May 5, 2022 at 12:38 PM Dave Allured - NOAA Affiliate <
dave.allured at noaa.gov> wrote:

> Prashanth, please remember to include the mailing list in your replies.
>
> It turns out that there are two different WRF forums.  The other one seems
> to be more active.  In particular, there is a modern discussion of CAPE
> behavior and parameterization in the post processing/RIP category.
>
>     https://forum.mmm.ucar.edu/
>
> Also note, NCL upgraded the CAPE routine in NCL 6.6.2.  I think that is
> the version that Dennis sent.  The older version in 6.5.0 was in fortran
> 77, and the results were somewhat different.  I would recommend the newer
> version over the older one.
>
> Last time I checked, late last year, the CAPE routine in WRF was identical
> to the NCL 6.6.2 version, except for a few "cosmetic" differences.
>
>
> On Thu, May 5, 2022 at 7:26 AM Prashanth Bhalachandran <
> prashanth.bhalachandran at gmail.com> wrote:
>
>> Thanks, Dave. I’ve gone through the various WRF forums but I am unable to
>> find what I specifically need. I am a bit weak in Fortran, so I am
>> struggling to find answers to the four basic elements (the parcel, the
>> environment, the levels of free convection, and neutral buoyancy) needed to
>> compute CAPE but I guess with enough persistence, I should extract it from
>> the Fortran code that Dennis sent.
>>
>> Prashanth
>>
>> On May 4, 2022, at 2:58 PM, Dave Allured - NOAA Affiliate <
>> dave.allured at noaa.gov> wrote:
>>
>> Prashanth, the CAPE routines were copied from the WRF project.  There
>> are active discussions about their software in the WRF forums.  I suggest
>> look in the Graphics and Post-Processing category.
>>
>>     https://wrfforum.com
>>
>> You can probably use the NCL wrap functions to call your own customized
>> CAPE fortran routine directly from NCL.
>>
>>
>> On Wed, May 4, 2022 at 3:26 PM Dennis Shea via ncl-talk <
>> ncl-talk at mailman.ucar.edu> wrote:
>>
>>> NCL developers did NOT develop the underlying fortran codes invoked by
>>> 'wrf_cape_3d'
>>> NCL developers created only the C interfaces between NCL and the fortran
>>> subroutines.
>>>
>>> Hence, we can not answer your questions. I have attached the fortran
>>> code that I think is used by NCL.
>>>
>>> Good Luck.
>>>
>>>
>>> On Wed, May 4, 2022 at 2:31 PM Sai Prasanth <
>>> prashanth.bhalachandran at gmail.com> wrote:
>>>
>>>> Dear NCL experts,
>>>> I am trying to compute the CAPE for the various columns in a cyclonic
>>>> storm and I'd like to change the definition of the "environment". As a
>>>> result, I'd like to have control over the various steps in the process and
>>>> prefer not to directly use the CAPE_3D subroutine. Unfortunately, I can't
>>>> seem to figure out how to calculate the integral limits viz. the level of
>>>> free convection and the level of equilibrium. I see that the parcel is
>>>> defined as the 500 m vertical block within which the various parameters are
>>>> averaged. Can you please share the code of wrf_cape_3d or explain in
>>>> algorithmic terms how the environment is defined, and how the two levels
>>>> that form the integral bounds are computed?
>>>>
>>>> Thank you,
>>>> Prashanth
>>>>
>>>
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