[ncl-talk] absolute vorticity (avo) stencil

[Mary Haley]

Hi Dave,

Thanks for providing this.  I will send it to the WRF folks to see if they
might be able to create a Fortran version from it. We could then build it
into NCL directly so it could be made available via wrf_user_getvar.

--Mary


On Fri, Jan 23, 2015 at 1:36 PM, David Jones <jonesd647 at yahoo.ca> wrote:

> Hi All,
>
> attached is an NCL script I made previously to calculate WRF Divergence.
> It's based on the WRF vorticity function's fortran script, that D and P
> refer to.
>
> Best,
> Dave.
>
>  ------------------------------
>
> Message: 9
> Date: Fri, 23 Jan 2015 10:15:24 -0700
> From: Dennis Shea <shea at ucar.edu>
> Subject: Re: [ncl-talk] absolute vorticity (avo) stencil
> To: Packard Chan <packard.chan at gmail.com>
> Cc: "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
> Message-ID:
>     <CAOF1d_6eSx48cbpxvSs40n1B6nqsC6c1E0M0nEmdSN32Gj8gTQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
>
> The WRF vorticity fortran code could possible be modified to compute
> divergence.
>
> On Fri, Jan 23, 2015 at 9:49 AM, Packard Chan <packard.chan at gmail.com>
> wrote:
>
> > 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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