[gradsusr] gradsusr Digest, Vol 29, Issue 55

[Chuan-Chi Tu]

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>

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> Today's Topics:
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>    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.
> >
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>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
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