[gradsusr] gradsusr Digest, Vol 29, Issue 56
Chuan-Chi Tu
beth0509 at gmail.com
Sun Jul 29 13:34:27 EDT 2012
Hi
The model estimate rainfall is come from WRF model ouput. But, I need to
calculate the vertically integrated moisture convergence from model output
u,v,and q.
Do you have a sample script for calculating the vertically integrated
moisture convergence?
How do you add gravity and density term to the equation? How should I
modified the script? Very appreciated for your input.
Chuan-Chi
2012/7/29 <gradsusr-request at gradsusr.org>
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> Today's Topics:
>
> 1. Maxloc (Stefan Gofferje)
> 2. Re: gradsusr Digest, Vol 29, Issue 55 (Chuan-Chi Tu)
> 3. Re: gradsusr Digest, Vol 29, Issue 55 (Jeff Duda)
> 4. Time interpolation (Stefan Gofferje)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Jul 2012 19:37:20 +0300
> From: Stefan Gofferje <stefan at saakeskus.fi>
> Subject: [gradsusr] Maxloc
> To: gradsusr at gradsusr.org
> Message-ID: <50141540.4080804 at saakeskus.fi>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> I was digging through the docs and found maxloc. From the description,
> it seems ideal from drawing "H" and "L" into a pressure chart but I
> somehow can't figure out how this works.
> Are there any examples anywhere?
>
> --Stefan
>
> --
> Suomen S??keskus - Hyv? s?? on makuasia
>
> Stefan Gofferje
> Haukantie 2 B 5
> FIN-37600 Valkeakoski
> GSM: +358 (41) 7290730
>
> http://www.saakeskus.fi/
> stefan at saakeskus.fi
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 28 Jul 2012 21:30:17 -0600
> From: Chuan-Chi Tu <beth0509 at gmail.com>
> Subject: Re: [gradsusr] gradsusr Digest, Vol 29, Issue 55
> To: gradsusr at gradsusr.org
> Message-ID:
> <
> CAHkS+LaLwgF7w_2YsE6tavpbnC3iNzX8kmpOE+kQxY1icp-3cg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
> I use u, v in m/s.
> I use the vint function. I has the gravity term in it.
> http://www.iges.org/grads/gadoc/gradfuncvint.html
>
> I am not sure if I add gravity term again. How do I add gravity and density
> term to the equation.
>
> The large value I get is about 120 mm/hr. The model simulated rain rate is
> 50-90 mm/hr. These two terms
> should be close. Thanks for the help.
>
> Chuan-Chi
>
> 2012/7/28 <gradsusr-request at gradsusr.org>
>
> > Send gradsusr mailing list submissions to
> > gradsusr at gradsusr.org
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://gradsusr.org/mailman/listinfo/gradsusr
> > or, via email, send a message with subject or body 'help' to
> > gradsusr-request at gradsusr.org
> >
> > You can reach the person managing the list at
> > gradsusr-owner at gradsusr.org
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of gradsusr digest..."
> >
> >
> > Today's Topics:
> >
> > 1. Re: calculating vertically integrated moisture convergence
> > (Jeff Duda)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Fri, 27 Jul 2012 11:59:44 -0500
> > From: Jeff Duda <jeffduda319 at gmail.com>
> > Subject: Re: [gradsusr] calculating vertically integrated moisture
> > convergence
> > To: GrADS Users Forum <gradsusr at gradsusr.org>
> > Message-ID:
> > <
> > CAAig09DuYno-BOwJYY7Ss1zfOO-f76fweTQr3HFywFueiF+5jQ at mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > What units are your u and v in? If they're not in not m/s, that may be
> the
> > cause. Also, it looks more like you are attempting to compute
> precipitable
> > water. If so, I think you are missing the density of liquid water and
> the
> > gravitational constant term.
> >
> > Jeff Duda
> >
> > On Fri, Jul 27, 2012 at 10:08 AM, Chuan-Chi Tu <beth0509 at gmail.com>
> wrote:
> >
> > > Hi
> > >
> > > Can anyone help on calculating vertically integrated moisture
> > convergence?
> > >
> > > I use following script but the value looks too high
> > >
> > > q: specific humidity kg/kg
> > > PSFC:hPa
> > >
> > > set lev 1000 300
> > > define qu=q*u
> > > define qv=q*v
> > > define conv=-hdivg(qu,qv)
> > >
> > > set lev 1000
> > > d vint(PSFC,conv,300)*60*60
> > > *(mm/hr)
> > >
> > > Can anyone help on correcting it? Thank you for your help.
> > >
> > > _______________________________________________
> > > gradsusr mailing list
> > > gradsusr at gradsusr.org
> > > http://gradsusr.org/mailman/listinfo/gradsusr
> > >
> > >
> >
> >
> > --
> > Jeff Duda
> > Graduate research assistant
> > University of Oklahoma School of Meteorology
> > Center for Analysis and Prediction of Storms
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> >
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> ------------------------------
>
> Message: 3
> Date: Sat, 28 Jul 2012 23:53:36 -0500
> From: Jeff Duda <jeffduda319 at gmail.com>
> Subject: Re: [gradsusr] gradsusr Digest, Vol 29, Issue 55
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <CAAig09AHnEGK=
> bJbCK1Jndx2hD08L-nG2fkFDH-yaj-xiYyKRQ at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I'm not familiar with using that method to estimate rain rate. Sorry, I
> cannot help you further.
>
> On Sat, Jul 28, 2012 at 10:30 PM, Chuan-Chi Tu <beth0509 at gmail.com> wrote:
>
> > Hi,
> > I use u, v in m/s.
> > I use the vint function. I has the gravity term in it.
> > http://www.iges.org/grads/gadoc/gradfuncvint.html
> >
> > I am not sure if I add gravity term again. How do I add gravity and
> > density term to the equation.
> >
> > The large value I get is about 120 mm/hr. The model simulated rain rate
> is
> > 50-90 mm/hr. These two terms
> > should be close. Thanks for the help.
> >
> > Chuan-Chi
> >
> > 2012/7/28 <gradsusr-request at gradsusr.org>
> >
> >> Send gradsusr mailing list submissions to
> >> gradsusr at gradsusr.org
> >>
> >> To subscribe or unsubscribe via the World Wide Web, visit
> >> http://gradsusr.org/mailman/listinfo/gradsusr
> >> or, via email, send a message with subject or body 'help' to
> >> gradsusr-request at gradsusr.org
> >>
> >> You can reach the person managing the list at
> >> gradsusr-owner at gradsusr.org
> >>
> >> When replying, please edit your Subject line so it is more specific
> >> than "Re: Contents of gradsusr digest..."
> >>
> >>
> >> Today's Topics:
> >>
> >> 1. Re: calculating vertically integrated moisture convergence
> >> (Jeff Duda)
> >>
> >>
> >> ----------------------------------------------------------------------
> >>
> >> Message: 1
> >> Date: Fri, 27 Jul 2012 11:59:44 -0500
> >> From: Jeff Duda <jeffduda319 at gmail.com>
> >> Subject: Re: [gradsusr] calculating vertically integrated moisture
> >> convergence
> >> To: GrADS Users Forum <gradsusr at gradsusr.org>
> >> Message-ID:
> >> <
> >> CAAig09DuYno-BOwJYY7Ss1zfOO-f76fweTQr3HFywFueiF+5jQ at mail.gmail.com>
> >> Content-Type: text/plain; charset="iso-8859-1"
> >>
> >> What units are your u and v in? If they're not in not m/s, that may be
> >> the
> >> cause. Also, it looks more like you are attempting to compute
> >> precipitable
> >> water. If so, I think you are missing the density of liquid water and
> the
> >> gravitational constant term.
> >>
> >> Jeff Duda
> >>
> >> On Fri, Jul 27, 2012 at 10:08 AM, Chuan-Chi Tu <beth0509 at gmail.com>
> >> wrote:
> >>
> >> > Hi
> >> >
> >> > Can anyone help on calculating vertically integrated moisture
> >> convergence?
> >> >
> >> > I use following script but the value looks too high
> >> >
> >> > q: specific humidity kg/kg
> >> > PSFC:hPa
> >> >
> >> > set lev 1000 300
> >> > define qu=q*u
> >> > define qv=q*v
> >> > define conv=-hdivg(qu,qv)
> >> >
> >> > set lev 1000
> >> > d vint(PSFC,conv,300)*60*60
> >> > *(mm/hr)
> >> >
> >> > Can anyone help on correcting it? Thank you for your help.
> >> >
> >> > _______________________________________________
> >> > gradsusr mailing list
> >> > gradsusr at gradsusr.org
> >> > http://gradsusr.org/mailman/listinfo/gradsusr
> >> >
> >> >
> >>
> >>
> >> --
> >> Jeff Duda
> >> Graduate research assistant
> >> University of Oklahoma School of Meteorology
> >> Center for Analysis and Prediction of Storms
> >> -------------- next part --------------
> >> An HTML attachment was scrubbed...
> >> URL:
> >>
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> >>
> >> ------------------------------
> >>
> >> _______________________________________________
> >> gradsusr mailing list
> >> gradsusr at gradsusr.org
> >> http://gradsusr.org/mailman/listinfo/gradsusr
> >>
> >>
> >> End of gradsusr Digest, Vol 29, Issue 55
> >> ****************************************
> >>
> >
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> >
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
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> ------------------------------
>
> Message: 4
> Date: Sun, 29 Jul 2012 15:37:26 +0300
> From: Stefan Gofferje <stefan at saakeskus.fi>
> Subject: [gradsusr] Time interpolation
> To: gradsusr at gradsusr.org
> Message-ID: <50152E86.8040008 at saakeskus.fi>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> is it possible to do time interpolation in map plots with grads?
> Obviously, when I use gxout line, some interpolation is done.
> I'd like to create movies/animations from gfs data but I'd like them to
> be a bit smoother than 3h-steps, let's say, 1h steps or even 30min-steps.
>
> How would I do this with grads?
>
> --Stefan
>
> --
> Suomen S??keskus - Hyv? s?? on makuasia
>
> Stefan Gofferje
> Haukantie 2 B 5
> FIN-37600 Valkeakoski
> GSM: +358 (41) 7290730
>
> http://www.saakeskus.fi/
> stefan at saakeskus.fi
>
>
>
>
> ------------------------------
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
> End of gradsusr Digest, Vol 29, Issue 56
> ****************************************
>
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