[ncl-talk] Vorticity Advection with NCL

[Dennis Shea]

NCL has no builtin function to advect a field (eg: vorticity) on a
curvilinear grid (eg: your WRF Grid)..
Maybe ask wrfhelp?

===
That said

https://www.ncl.ucar.edu/Applications/ESMF.shtml
Example 29a
or, maybe better,
Example 37

outlines a method that might be used for your needs.

===
Good luck


On Wed, May 16, 2018 at 7:40 AM, Lara Quitián Hernández <
laraquitianhernandez at gmail.com> wrote:

> Hello,
>
> Thank you. In the case of calculating the horizontal advection for
> *vorticity*, it would be better to use the direct WRF variable ( vo =
> wrf_user_getvar(a,"*avo*",-1)) or define it via different functions:
> https://www.ncl.ucar.edu/Applications/vort.shtml
>
> The only example in the link defines the Vorticity like this:
>
> ;************************************************
> ; calculate vorticity on a Gaussian Grid
> ; scale for visual convenience
> ;************************************************
>   scale = 1.e05
>   vrt   = u                                      ; retain coordinates
>   vrt   = uv2vrG_Wrap(u,v) * scale
>   vrt at long_name = "vorticity"
>   vrt at units     = "scaled"
>
>
> However, my simulations are generated on a Lambert Conformal grid
> projection, not Gaussian one. Does this change the procedure to calculate
> it?
>
> Regards,
> Lara
>
> 2018-05-16 14:28 GMT+02:00 Dennis Shea <shea at ucar.edu>:
>
>> Maybe:
>>
>> https://www.ncl.ucar.edu/Document/Functions/Contributed/
>> advect_variable.shtml
>>
>> 'x' would be vorticity
>>
>> Good Luck
>>
>> On Wed, May 16, 2018 at 4:01 AM, Lara Quitián Hernández <
>> laraquitianhernandez at gmail.com> wrote:
>>
>>> Good morning,
>>>
>>> I would like to know if there is a possibility of calculating the
>>> Vorticity Advection with NCL.
>>>
>>> Thanks in advance.
>>>
>>> Regards,
>>> Lara
>>>
>>>
>>> --
>>>
>>>
>>> *Lara Quitián Hernández, PhD Student*
>>> Departamento de Física de la Tierra, Astronomía y Astrofísica
>>> Facultad de Ciencias Físicas
>>> Ciudad Universitaria, Plaza Ciencias, 1
>>> <https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g>
>>> 28040 Madrid. Spain
>>> <https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g>
>>> Email: lquitian at ucm.es <mlunar at aemet.es>
>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
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>>> List instructions, subscriber options, unsubscribe:
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>>>
>>
>
>
> --
>
>
> *Lara Quitián Hernández, PhD Student*
> Departamento de Física de la Tierra, Astronomía y Astrofísica
> Facultad de Ciencias Físicas
> Ciudad Universitaria, Plaza Ciencias, 1
> <https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g>
> 28040 Madrid. Spain
> <https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g>
> Email: lquitian at ucm.es <mlunar at aemet.es>
>
>
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