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Jeff,<br><br>I seems my question wasn't well framed, and so you dealt with the typo. I have attached two Figs showing what the calculations below will give and what exactly I'll like to do.<br><br>Thanks,<br><br>Hyacinth<br><br><br>> Date: Thu, 15 Sep 2011 17:34:50 -0500><br>From: Jeffrey Duda <jdduda@iastate.edu>><br> Subject: Re: [gradsusr] Moisture flux convergence/divergence<br>> To: GrADS Users Forum <gradsusr@gradsusr.org><br><div>> Message-ID:<br>>         <CAP9LQ-VNkxcu-+ey_QkZU7f4MHf+VwJDvav=Dci3ns+x+pjG8Q@mail.gmail.com><br>> Content-Type: text/plain; charset="iso-8859-1"<br>> <br>> Set the graphics output to vector ('set gxout vector'), then 'd zon;mer'<br>> (note the semicolon instead of a comma).<br>> <br>> Jeff Duda<br>> <br>> 2011/9/15 Hyacinth Nnamchi <hyacinth.1@hotmail.com><br>> <br>> > Hello,<br>> ><br>> > This is not directly about GrADS but since most of address similar<br>> > problems, I guess someone on this forum will be able to answer my question.<br>> ><br>> > I understand that to calculate moisture transport, given zonal, meridional<br>> > winds and specific humidity, can simply do:<br>> ><br>> > 'define zon=uwnd.1*shum.3'<br>> > 'define mer=vwnd.2*shum.3'<br>> > 'd zon,mer'<br>> ><br>> > But, I want to plot vectors indicating field of net moisture flux (all arrows converging/diverging) instead of just transport.<br>> ><br>> > Thanks for any ideas.<br>> ><br>> > Hyacinth<br>> ><br>> ><br>> > __<br></div>                                            </div></body>
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