[gradsusr] gradsusr Digest, Vol 29, Issue 55

[Jeff Duda]

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>
>
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>> 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.
>> >
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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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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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