[ncl-talk] CAPE calculation

[Barry Lynn]

My guess would be that some locations do not meet the criteria within the
code for calculating CAPE -- these points are ignored.  For instance, if
the iteration fails within.

Barry

On Wed, Nov 10, 2021 at 3:11 AM Dennis Shea via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> NCL developers did not write CAPE_{2D/3D) fortran subroutines called by
> NCL. I have no experience with these functions.
>
> I have attached the fortran code invoked by NCL. Perhaps the following
> subroutines will provide some insight.
>
> DCAPECALC3D
> DCAPECALC2D
>
> Note that at the top of the code a disclaimer is issued:
>
> "! Also, be advised that missing data values are not checked during the
> computation."
> ===
> Perhaps some input variable has _FillValue
>
> Good Luck
>
>
>
> On Tue, Nov 9, 2021 at 10:21 AM Wang, Jiali via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Dear NCL users,
>>
>>
>>
>> I have been using wrf_get_uservar to get cape_2d and cape_3d for my
>> research domain, over the Great Lakes region. There are water bodies and
>> land. I noticed there are many missing values in both cape_2d and 3d
>> outcomes. See some examples attached. I have also tried to use wrf_cape_2d
>> to calculate cape_2d, and I made sure the PSFC is converted to hPa. The
>> outcome is almost the same, with lots of missing values. Missing values are
>> located over different places at different times.
>>
>>
>>
>> However, it seems the missing value is not expected?
>> https://www.ncl.ucar.edu/Support/talk_archives/2013/2422.html
>>
>>
>>
>> Can you advice what is the correct way to calculate CAPE or whether I am
>> getting reasonable results?
>>
>>
>>
>> Thank you!
>>
>> Jiali
>>
>>
>>
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-- 

Barry H. Lynn, Ph.D
Senior Scientist, Lecturer,
The Institute of Earth Sciences,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

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