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<DIV><FONT color=#000000>I think streamfunciton is to see cyclonic
and anticyclonic circulations in horizontal plane, not in the
vertical. For vertical circulation purposes you may use
horizontal and vertical winds or mass-streamfunction. I don't know
how to calcuate the later in grads.</FONT></DIV>
<DIV><FONT color=#000000>Good Luck!</FONT></DIV>
<DIV><FONT color=#c0c0c0>2012-05-22 </FONT></DIV>
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<DIV><FONT color=#c0c0c0><SPAN>
<DIV>
<DIV><FONT size=2 face=Verdana></FONT><FONT size=4
face="Franklin Gothic Book">Muhammad Afzaal Karori</FONT></DIV>
<DIV><FONT face="Franklin Gothic Book">Institute of Atmospheric
Physics</FONT></DIV>
<DIV><FONT face="Franklin Gothic Book">Chinese Academy of
Sciences</FONT></DIV>
<DIV><FONT face="Franklin Gothic Book">Beijing - P.R.
China</FONT></DIV>
<DIV> </DIV></DIV></SPAN></FONT></DIV>
<HR>
<DIV><STRONG>发件人：</STRONG> resmi ea </DIV>
<DIV><STRONG>发送时间：</STRONG> 2012-05-22 18:18:13 </DIV>
<DIV><STRONG>收件人：</STRONG> GrADS Users Forum </DIV>
<DIV><STRONG>抄送：</STRONG> </DIV>
<DIV><STRONG>主题：</STRONG> [gradsusr] stream function in pressure
level </DIV></FONT>
<DIV> </DIV>
<DIV>Dear users<BR> i have calculated stream function using
open grads from 1000-10 hPa level using NCEP/NCAR reanalysis data
ex.1dec2009<BR>The grads script give the grd file containing three
variable like psi,upsi and vpsi.<BR>Here i have attached the figure.
i find mistake in the figure...the programme doesnot undergone
integration part, at each level it calculate three variable and
finally dispalys.<BR> i want to know that whether it is correct
or not. how can i modify the programme<BR>'reinit'<BR>'sdfopen
G:\windows\ncep\uwnd\<A
href="http://uwnd.2009.nc">uwnd.2009.nc</A>'<BR>'sdfopen
G:\windows\ncep\uwnd\<A
href="http://vwnd.2009.nc">vwnd.2009.nc</A>'<BR>'set lon 0
357.5'<BR>'set lat -90 90'<BR>prompt 'key-in file name for
psi:'<BR>pull fname<BR>'set fwrite 'fname<BR>tt=1<BR>while
(tt<=1)<BR>'set t 'tt<BR>zz=1<BR>while (zz<=17)<BR>'set z
'zz<BR>'define psi= fish_psi(uwnd,vwnd.2)'<BR>'define
one=1+0*lat'<BR>'define upsi=mvadv(one,psi)'<BR>'define
vpsi=-muadv(one,psi)'<BR>'set gxout fwrite'<BR>'d psi/1e7'<BR>'d
upsi'<BR>'d
vpsi'<BR>zz=zz+1<BR>endwhile<BR>tt=tt+1<BR>endwhile<BR>'disable
fwrite'<BR><BR><BR clear=all><BR>-- <BR>Resmi E A<BR>Research
Scholar<BR>Cochin university of science and
technology<BR>Cochin-16<BR><BR></DIV></DIV></TD></TR></TBODY></TABLE></TD>
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