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.<br>
<br>Jeff Duda<br><br><div class="gmail_quote">On Fri, Jul 27, 2012 at 10:08 AM, Chuan-Chi Tu <span dir="ltr"><<a href="mailto:beth0509@gmail.com" target="_blank">beth0509@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span style="border-collapse:collapse;color:rgb(34,34,34);font-family:arial,sans-serif;font-size:14px">Hi<div><br></div><div>Can anyone help on calculating vertically integrated moisture convergence?</div>
<div><br></div><div>I use following script but the value looks too high</div><div><br></div><div>q: specific humidity kg/kg</div><div>PSFC:hPa</div><div><br></div><div>set lev 1000 300</div><div>define qu=q*u</div><div>define qv=q*v</div>
<div>define conv=-hdivg(qu,qv)</div><div><br></div><div>set lev 1000</div><div>d vint(PSFC,conv,300)*60*60 </div><div>*(mm/hr)</div><div><br></div><div>Can anyone help on correcting it? Thank you for your help.</div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br><br>