Thanks for your reply<div>Actually am using meridional wind component (vwind) and </div><div>so am trying to plot (find) rising motion and sinking motion </div><div>over latitude from -90S to 90N (i.e we can see three cells Hadley, Ferrel, Polar)</div>
<div>at different pressure levels</div><div>for this am using</div><div>sdfopen <a href="http://vwnd.nc">vwnd.nc</a></div><div>sdfopen <a href="http://wwnd.nc">wwnd.nc</a> (vertical velocity)</div><div>set lat -90 90</div>
<div>set lon 40 110</div><div>set lev 500</div><div>d skip(vwnd,1,1);-vvel*1.0*e3 (this command have got it from grads document from IISc)</div><div>if you give this command its plotting the wind directions but not rising n sinking motions</div>
<div>vvel is pressure velocity. </div><div><br></div><div><br></div><div><br><br><div class="gmail_quote">On Mon, Sep 17, 2012 at 12:59 PM, Sravan <span dir="ltr"><<a href="mailto:sravan_sase@yahoo.in" target="_blank">sravan_sase@yahoo.in</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-size:12pt;font-family:arial,helvetica,sans-serif"><div>Hi,</div><div>Let me know the script that you are using to calculate the stream function and the error message.</div>
<div><br></div><div>Sravan</div><div><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"> </div><div></div><div style="font-size:12pt;font-family:arial,helvetica,sans-serif">
<div style="font-size:12pt;font-family:'times new roman','new york',times,serif"><div dir="ltr"><font face="Arial"> <b><span style="font-weight:bold">From:</span></b> kalyan chakravarthy <<a href="mailto:kalyan4space@gmail.com" target="_blank">kalyan4space@gmail.com</a>><br>
<b><span style="font-weight:bold">To:</span></b> <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a> <br> <b><span style="font-weight:bold">Sent:</span></b> Monday, 17 September 2012 12:07 PM<br>
<b><span style="font-weight:bold">Subject:</span></b> [gradsusr] STREAM FUNCTION<br> </font> </div><div><div class="h5"> <br><div><pre><font face="courier new, monospace" size="4"><br></font></pre><pre><font face="courier new, monospace" size="4">Dear All,</font></pre>
<pre><font face="courier new, monospace" size="4"><br></font></pre><blockquote style="margin:0 0 0 40px;border:none;padding:0px">
<pre style="text-align:left"><font face="courier new, monospace" size="4">I have global wind data at 2.5 degrees resolution and need to calculate</font></pre><pre style="text-align:left"><span style="font-size:large">and display a mean meridional wind stream function (rising and sinking </span></pre>
<pre style="text-align:left"><font face="courier new, monospace" size="4">motions of three cells) in GrADS. I have choose domain -90S/90N and 40/110E.</font></pre><pre style="text-align:left"><span style="font-size:large">Then I want to calculate and display psi.</span><font size="4" face="courier new, monospace">I'm having trouble figuring out a way to</font></pre>
<pre style="text-align:left"><font size="4" face="courier new, monospace">structure this within GrADS.</font><span style="font-size:large"> How to calculate psi from wind components.</span></pre>
<pre style="text-align:left"><span style="font-size:large">Any suggestions, or a script for me to use? Thanks.</span></pre></blockquote><div><br></div><font face="courier new, monospace" size="4">-- <br>
</font><div><font face="courier new, monospace" size="4">Regards</font></div><div><font face="courier new, monospace" size="4">Y.Kalyan Chakravarthy</font></div><div><font face="courier new, monospace" size="4">Indian Meteorological Department</font></div>
<div><font face="courier new, monospace" size="4">New Delhi</font></div><div><br></div><div><div><br></div></div><div><br></div><div><div><font face="'comic sans ms', sans-serif"><br></font><br></div></div><br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><span style="font-family:'comic sans ms',sans-serif">Regards</span></div><div><span style="font-family:'comic sans ms',sans-serif">Y.Kalyan Chakravarthy</span></div>
<div>Indian Meteorological Department</div><div>New Delhi</div><div><br></div><div><div><span style="background-color:rgb(231,244,216)"><i><font face="georgia, serif" color="#009900">" No single technology will stop global warming, but there is a silver bullet: </font></i></span></div>
<div><font color="#009900"><span style="background-color:rgb(231,244,216)"><i><font face="georgia, serif">a cap on carbon that will launch all these solutions into the mainstream".</font></i></span></font></div></div>
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