The pressure gradient is simply 1/rho * del(p), where del(p) is the gradient operator, which can be displayed in Grads using the mathematical decomposition of the gradient operator (i.e., derivatives in the x- and y-directions). Use cdiff for those derivatives. Note, you'll have to define your x- and y- grid spacing values as well. See the examples on the <a href="http://www.iges.org/grads/gadoc/gradfunccdiff.html">cdiff help page</a> for how to do that.<br>
<br>Jeff Duda<br><br><div class="gmail_quote">On Wed, Aug 8, 2012 at 5:48 AM, Djordje Romanic <span dir="ltr"><<a href="mailto:djordje8@gmail.com" target="_blank">djordje8@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear Users, <br><br>I have to calculate the pressure gradient in a given
area (Southeast Europe) and I have a pressure date at 2.5 x 2.5 degrees
(reanalysis data). Does anyone know how to calculate it in GrADS and
how to show the results in the vector form? <br>
<br>Thanks in advance.<br><br>Regards,<br clear="all">Djordje Romanic<br>M.Sc. in Meteorology<br>Cell: +38164 254 3539<br><a href="http://www.linkedin.com" target="_blank">www.linkedin.com</a> (Djordje Romanic profile)<br>
<br>
<br>_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
<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>