On top of Pavel's advice, use the vint() function to compute the mass weighted vertical integral of divergence. There will be some errors if you assume omega at the surface is zero, and you should try to correct for there being zero omega at the tropopause, but that's only if you need very accurate results.<br>
<br>Jeff Duda<br><br><div class="gmail_quote">On Thu, Jan 10, 2013 at 5:43 AM, Pavel Kishcha <span dir="ltr"><<a href="mailto:pavel@cyclone.tau.ac.il" target="_blank">pavel@cyclone.tau.ac.il</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><p class="MsoNormal" style="direction:ltr">Rana,</p>
<p class="MsoNormal" style="direction:ltr"> </p>
<p class="MsoNormal" style="direction:ltr">The
GRADS function hdivg(u,v) calculates the horizontal divergence (du/dx+dv/dy).</p>
<p class="MsoNormal" style="direction:ltr">Here
is a link:</p>
<p class="MsoNormal" style="direction:ltr"><a href="http://www.iges.org/grads/gadoc/gadocindex.html" target="_blank">http://www.iges.org/grads/gadoc/gadocindex.html</a></p>
<p class="MsoNormal" style="direction:ltr"> </p>
<p class="MsoNormal" style="direction:ltr">Pavel</p><p class="MsoNormal" style="direction:ltr"><br></p><br><div class="gmail_quote"><div><div class="h5">On Thu, Jan 10, 2013 at 12:48 PM, Rana Samuels <span dir="ltr"><<a href="mailto:ranas@post.tau.ac.il" target="_blank">ranas@post.tau.ac.il</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Dear all,<br>I would like to calculate the vertical velocity/omega from the continuity equation:<br>
<br>
du/dx+dv/dy+dw/dp=0<br><br>(where I have u, v and would like to calculate it from 1000 to 300 mb)<br><br>
Can anyone help me with this?<br>Thanks<span><font color="#888888"><br>Rana<br></font></span></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>