On Mon, Jun 21, 2010 at 10:58 AM, Giovana Luz <span dir="ltr"><<a href="mailto:luzgiovana@hotmail.com">luzgiovana@hotmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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Hello all,<br><br><br>I've tried to use fish function, to calculate streamfunction (fish_psi)<br>and velocity potential (fish_chi), I get to use, but results are different<br>of website that I compare, using the same data and time.<br>
<br>*************<br><br>'sdfopen <a href="http://uwnd.mon.mean.nc" target="_blank">uwnd.mon.mean.nc</a>'<br>'sdfopen <a href="http://vwnd.mon.mean.nc" target="_blank">vwnd.mon.mean.nc</a>'<br><br>'set t 1 last'<br>
<br>'set z 10' ***200 hpa<br><br><br>*streamfunction<br>'define psi = fish_psi(uwnd,vwnd.2)'<br><br>*velocity potential<br>'define chi = fish_chi(uwnd,vwnd.2)'<br><br>**************<br>someone could help me?<br>
<br></div></blockquote><div><br></div><div>Streamfunction and velocity potential are defined up to an arbitrary constant. It is common practice to remove the global mean, e.g.,</div><div><br></div><div>ga-> d chi - aave(chi,global)</div>
<div><br></div><div>This is mentioned in the documentation:</div><div><br></div><div> <a href="http://opengrads.org/doc/udxt/fish/">http://opengrads.org/doc/udxt/fish/</a></div><div><br></div><div> Arlindo</div>
<div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div>Thanks,<br><br>Giovana Luz<br>______________________________________________<br><font size="2"> <br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>