Hi,<div>I use u, v in m/s.<br><div>I use the vint function. I has the gravity term in it.</div><div><a href="http://www.iges.org/grads/gadoc/gradfuncvint.html">http://www.iges.org/grads/gadoc/gradfuncvint.html</a></div><div>
<br></div><div>I am not sure if I add gravity term again. How do I add gravity and density term to the equation.</div><div><br></div><div>The large value I get is about 120 mm/hr. The model simulated rain rate is 50-90 mm/hr. These two terms</div>
<div>should be close. Thanks for the help.</div><div><br></div><div>Chuan-Chi <br><br><div class="gmail_quote">2012/7/28 <span dir="ltr"><<a href="mailto:gradsusr-request@gradsusr.org" target="_blank">gradsusr-request@gradsusr.org</a>></span><br>
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Today's Topics:<br>
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1. Re: calculating vertically integrated moisture convergence<br>
(Jeff Duda)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Fri, 27 Jul 2012 11:59:44 -0500<br>
From: Jeff Duda <<a href="mailto:jeffduda319@gmail.com">jeffduda319@gmail.com</a>><br>
Subject: Re: [gradsusr] calculating vertically integrated moisture<br>
convergence<br>
To: GrADS Users Forum <<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a>><br>
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<br>
What units are your u and v in? If they're not in not m/s, that may be the<br>
cause. Also, it looks more like you are attempting to compute precipitable<br>
water. If so, I think you are missing the density of liquid water and the<br>
gravitational constant term.<br>
<br>
Jeff Duda<br>
<br>
On Fri, Jul 27, 2012 at 10:08 AM, Chuan-Chi Tu <<a href="mailto:beth0509@gmail.com">beth0509@gmail.com</a>> wrote:<br>
<br>
> Hi<br>
><br>
> Can anyone help on calculating vertically integrated moisture convergence?<br>
><br>
> I use following script but the value looks too high<br>
><br>
> q: specific humidity kg/kg<br>
> PSFC:hPa<br>
><br>
> set lev 1000 300<br>
> define qu=q*u<br>
> define qv=q*v<br>
> define conv=-hdivg(qu,qv)<br>
><br>
> set lev 1000<br>
> d vint(PSFC,conv,300)*60*60<br>
> *(mm/hr)<br>
><br>
> Can anyone help on correcting it? Thank you for your help.<br>
><br>
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<br>
--<br>
Jeff Duda<br>
Graduate research assistant<br>
University of Oklahoma School of Meteorology<br>
Center for Analysis and Prediction of Storms<br>
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