<div>Dear GrADS-users,</div> <div>Sorry if some of you getting this mail for the second time. In fact, I sent this mail to <A href="mailto:gradsusr@list.cineca.it">gradsusr@list.cineca.it</A> a few days ago but I didn't receive it to my mailbox back. So I decided to send it again!<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></div> <div>I am trying to write a script for calculating diabatic heating.<BR>Actually, it can be computed from the thermodynamic equation.<BR>It is consist of three following terms:<BR>''(dtheta/dt)+(u*dtheta/dx+v*dtheta/dy)-(omega*dtheta/dp)''<BR>I have written a script and it seems that I have succeeded to compute terms 1 and 2 but somthing is wrong with term3.<BR> As I am not sure about their accuracy, would somebody please help me and check if the script is correct for terms 1 and 2?<BR>and also,<BR>I have really appreciate any help to make a correction of term3.<BR> Sorry for long note and
thank you very much for your time.<BR>Azar Zarrin<BR></div> <div><BR>'reinit'<BR>*****opening four files (NCEP/NCAR DAILY MEAN) of air temprature,u,v and omega.<BR>'sdfopen airtemp.nc'<BR>'sdfopen uwind.nc'<BR>'sdfopen vwind.nc'<BR>'sdfopen omega.nc'<BR> 'PP = lev'<BR>'set lat 0 50'<BR>'set lon 400 480'<BR>'set lev 1000 100'<BR>'set t 2'<BR> "define Term1 = (air(t-1)*pow(1000/PP(t-1),0.286)-air*pow(1000/PP,0.286)))/24"<BR>'set lat 32.5'<BR>'set zlog on'<BR>'d Term1'<BR> say 'hit return to continue and plot'<BR>pull cmd<BR>'c'<BR> 'set lat 0 50'<BR>'set lon 400 480'<BR>'set lev 1000 100'<BR>'set t 2'<BR>'define pt=air+273.15*pow(1000/PP,0.286)'<BR>"dptx =(cdiff(pt,x))"<BR>"dpty =(cdiff(pt,y))"<BR>'set dfile 2'<BR>'u = uwnd'<BR>"dux =(cdiff(u,x))"<BR>'set dfile 3'<BR>'v=vwnd'<BR>"dvy =(cdiff(v,y))"<BR>'dx = cdiff(lon,x)*cos(lat*3.14/180)*111325'<BR>"dy =cdiff(lat,y)*55445"<BR>'define Term2 = (pt*(dux/dx))+(pt*(dvy/dy))'<BR>'set lat 32.5'<BR>'set zlog
on'<BR>'d Term2'<BR> <div><BR>say 'hit return to continue and plot'<BR>pull cmd<BR>'c'<BR> 'set lat 0 50'<BR>'set lon 400 480'<BR>'set lev 1000 100'<BR>'set t 2'<BR>'set dfile 1'<BR>"define Term3=(air(z-1)*pow(1000/PP(z-1),0.286)-air(z+1)*pow(1000/PP(z+1),0.286)))/(PP(z-1)-PP(z+1))"<BR>'set lat 32.5'<BR>'set zlog on'<BR>'d Term3'<BR>say error.....<BR>Cannot plot data - all undefined values.<BR> ----------------------------------------------------------------<BR>Azar Zarrin<BR>Geography Dept.<BR>Tarbiat Modares University<BR>Tehran, Iran<BR> <div><BR> <div><BR></div><p> 
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