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Re: 20020125: Richardson Number from grids

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  • Subject: Re: 20020125: Richardson Number from grids
  • Date: Fri, 25 Jan 2002 12:47:07 -0700

On Fri, 25 Jan 2002, Patrick O'Reilly wrote:

> I guess I should have included this, but would the same apply for
> Brunt-Vaisala frequency in a layer (BVFQ)?
>
> GFUNC=BVFQ(wnd)
>
> Patrick


Patrick,
No, Brunt-Vaisala frequency is not dependent on wind.
From "phelp gfunc" within a GEMPAK program, you will find:
 BVSQ    (THTA)          Brunt-Vaisala frequency squared in a layer

so, use GFUNC=BVSQ(THTA).

The Richardson number online help provides:
 RICH    (V)             Richardson stability number in a layer

where V is a vector. In the message I sent you, WND is one possible
vector, meaning the total wind.


Steve Chiswell
Unidata User Support












>
> ----- Original Message -----
> From: "Steve Chiswell" <address@hidden>
> To: "Patrick O'Reilly" <address@hidden>
> Cc: <address@hidden>; <address@hidden>
> Sent: Friday, January 25, 2002 12:18 PM
> Subject: 20020125: Richardson Number from grids
>
>
> >
> > Patrick,
> >
> > In gdprof, use GFUNC = rich(wnd).
> >
> > Steve Chiswell
> > Unidata User Support
> >
> > On Fri, 25 Jan 2002, Patrick O'Reilly wrote:
> >
> > > Using gempak, I have created vertical profiles of Richardson number
> using SNPROF with SNPARM=RICH.  The output is a plot of Richardson number
> vs. height, and the values look reasonable.  I want to create similar plots
> from model data, using GDPROF.  Is this possible, and if so, has anyone
> plotted Richardson number using the GDPROF program?
> > >
> > > In the gempak manual, it shows:
> > >
> > > RICH = BFVQ ** 2  / SHRM ** 2
> > >
> > > and
> > >
> > > RICH (V) = GRVTY * DZ * LDF (THTA) / ( LAV (THTA) * MAG (VLDF(V)) ** 2)
> > >
> > > I am having trouble putting either of these into a form that can be used
> as a GFUNC in GDPROF.  Any clues will be appreciated!
> > >
> > > Thanks-
> > >
> > > Patrick
> > >
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > Patrick O'Reilly                               Support Scientist
> > > The STORM Project            address@hidden
> > > 208 Latham Hall                             ph: 319-273-3789
> > > University of Northern Iowa
> > > Cedar Falls, IA 50614
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > >
> > >
> >
>