[gradsusr] stream function in pressure level

[afzaalkarori]

  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.
Good Luck!
2012-05-22 



Muhammad Afzaal Karori
Institute of Atmospheric Physics
Chinese Academy of Sciences
Beijing - P.R. China




发件人： resmi ea 
发送时间： 2012-05-22  18:18:13 
收件人： GrADS Users Forum 
抄送： 
主题： [gradsusr] stream function in pressure level 

Dear users
 i have calculated stream function using open grads from 1000-10 hPa level using NCEP/NCAR reanalysis data ex.1dec2009
The grads script give the grd file containing three variable like psi,upsi and vpsi.
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.
 i want to know that whether it is correct or not. how can i modify the programme
'reinit'
'sdfopen G:\windows\ncep\uwnd\uwnd.2009.nc'
'sdfopen G:\windows\ncep\uwnd\vwnd.2009.nc'
'set lon 0 357.5'
'set lat -90 90'
prompt 'key-in file name for psi:'
pull fname
'set fwrite 'fname
tt=1
while (tt<=1)
'set t 'tt
zz=1
while (zz<=17)
'set z 'zz
'define psi= fish_psi(uwnd,vwnd.2)'
'define one=1+0*lat'
'define upsi=mvadv(one,psi)'
'define vpsi=-muadv(one,psi)'
'set gxout fwrite'
'd psi/1e7'
'd upsi'
'd vpsi'
zz=zz+1
endwhile
tt=tt+1
endwhile
'disable fwrite'



-- 
Resmi E A
Research Scholar
Cochin university of science and technology
Cochin-16


 
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