[ncl-talk] absolute vorticity (avo) stencil

[Packard Chan]

Hi Corey,

If you are using WRF, you might also want to try the following.

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
...

avo = wrf_user_getvar(filehandle, "avo", time)

The subroutine "DCOMPUTEABSVORT" will be eventually called by this function.
Attached is the source code that gives the implementation of the
subroutine, which is available in the source code of NCL.
ncl_ncarg-6.2.1/ni/src/lib/nfpfort/wrf_pvo.f

Good luck.

Packard


Packard Chan
Year 4 undergraduate
Major in Atmospheric Sciences
School of Physics, Peking University
Mobile: (86)188-1050-8009

On Fri, Jan 23, 2015 at 4:28 AM, Dennis Shea <shea at ucar.edu> wrote:

> NCL does not have a function for this. (WRF => deivergence
>
> I have asked several people associated with WRF for some fortran or C code
> we could implemet from within NCL. The answer is "none is available".
>
> See
>
> http://www.ncl.ucar.edu/Applications/ESMF.shtml
> See Example 29
>
> Maybe this would work for you.
>
> D
>
> On Thu, Jan 22, 2015 at 7:37 AM, Corey Potvin - NOAA Affiliate <
> corey.potvin at noaa.gov> wrote:
>
>> Hi Dennis,
>>
>> It's Arakawa-C, non-idealized WRF.
>>
>> Corey
>>
>> On Thu, Jan 22, 2015 at 8:18 AM, Dennis Shea <shea at ucar.edu> wrote:
>>
>>> Off line.
>>>
>>> What type of grid do you have?
>>>
>>> D
>>>
>>> On Thu, Jan 22, 2015 at 6:23 AM, Corey Potvin - NOAA Affiliate <
>>> corey.potvin at noaa.gov> wrote:
>>>
>>>> Hello,
>>>>
>>>> Could someone please tell me what (u,v) stencil is used to compute
>>>> absolute vorticity, or direct me to the relevant script?
>>>>
>>>> Thanks!
>>>>
>>>> Corey
>>>>
>>>> --
>>>> ******************
>>>> Corey Potvin, Ph.D.
>>>> Research Scientist, Cooperative Institute for Mesoscale Meteorological
>>>> Studies and
>>>> NOAA/National Severe Storms Lab
>>>> Adjunct Assistant Professor, University of Oklahoma
>>>> National Weather Center
>>>> Norman, Oklahoma
>>>> Office: (405) 325-6674
>>>> Cell: (405) 206-0485
>>>>
>>>> _______________________________________________
>>>> ncl-talk mailing list
>>>> List instructions, subscriber options, unsubscribe:
>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>
>>>>
>>>
>>
>>
>> --
>> ******************
>> Corey Potvin, Ph.D.
>> Research Scientist, Cooperative Institute for Mesoscale Meteorological
>> Studies and
>> NOAA/National Severe Storms Lab
>> Adjunct Assistant Professor, University of Oklahoma
>> National Weather Center
>> Norman, Oklahoma
>> Office: (405) 325-6674
>> Cell: (405) 206-0485
>>
>
>
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>
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