[ncl-talk] Components of Divergence in NCL

[Dennis Shea]

The latest release: 6.6.2:
*https://www.ncl.ucar.edu/current_release.shtml*
<https://www.ncl.ucar.edu/current_release.shtml>

    *shear_stretch_deform*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml>
- Using spherical harmonics, estimate the kinematic shear-deformation,
stretch-deformation and total-deformation of a global horizontal
(east-west) wind field.

    *shear_stretch_deform_cfd*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform_cfd.shtml>
- Using centered-finite-differences, estimate the kinematic
shear-deformation, stretch-deformation and total-deformation of a global or
regional horizontal (east-west) wind field
~


*https://www.ncl.ucar.edu/Applications/gradients.shtml  *
<https://www.ncl.ucar.edu/Applications/gradients.shtml>

See the* shear_stretch_deform_1.ncl *example.

The codes are located in contributed.ncl

You could look at these and, possibly, modify as needed.

Good Luck


On Thu, May 2, 2019 at 5:28 AM Barry Lynn <barry.h.lynn at gmail.com> wrote:

> Hi:
>
> You need to have someone from the NCL "team" send you the fortran code,
> and then you can edit it and use "WRAPIT" to obtain the terms you want.
>
> Barry
>
> On Thu, May 2, 2019 at 10:19 AM Lyndz <olagueralyndonmark429 at gmail.com>
> wrote:
>
>> Dear NCL experts,
>>
>> I have been using the divergence (via spherical harmonics) routine in NCL:
>> https://www.ncl.ucar.edu/Document/Functions/Built-in/uv2dvF-1.shtml
>>
>> Based on previous literatures, the divergence can be decomposed to its
>> directional (diffluence) and speed (stretching) components (natural
>> coordinates).
>>
>> https://www.weather.gov/media/wrh/online_publications/TAs/ta9139.pdf
>>
>> http://www.inscc.utah.edu/~steenburgh/classes/5110/lecture_notes/divergence+deformation.pdf
>>
>> [1] Is it possible to extract these terms in NCL?
>> [2] If yes, I would like to ask for suggestions on how to do this in NCL.
>>
>> Sincerely,
>>
>> Lyndz
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>
>
> --
> Barry H. Lynn, Ph.D
> Senior Associate Scientist, Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
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