[RegCNET] How to calculate the geopotential height and defintion problem

[Satyaban Bishoyi Ratna]

Hi Rajesh,
Why don't you use the Post Processing tool of RegCM3.
This post processing tool will solve all your query in this mail.
This tool can help you to derive monthly mean of your desired variables and also it can get geopotential height.

Anyway, there is some wrong with defining time with your grads script.
You see each CTL file and average the variable as per the number of time stamp available. You can use this example script with slight modification of your script.

define r1=ave(tpr.1,t=1,t=120)*30/10
define r2=ave(tpr.2,t=1,t=124)*31/10
define r3=ave(tpr.3,t=1,t=124)*31/10 ....and so on.

The same method you can apply for wind. Hope this helps you.

Thanks.

Regards
Satyaban




On Thu, 13 May 2010 12:01:23 +0530  wrote
>Hello All,
 
 I am plotting monthly and seasonal precipitaion  , circulation field(200,850).
These are the step(Given below) i am following for plot like precipitation and vector wind.
Let me correct , if i am missing something  for correct plot.
I need help on how to  plot geopotential height(monthly and seasonal) and give the idea(with example) . 
Please  help me regarding the above problem.
 
ga-> open ATM.2005060100.ctl 
Scanning description file:  ATM.2005060100.ctl
Data file ATM.2005060100 is open as file 1
LON set to 49.4242 111.019 
LAT set to -10.48 39.77 
LEV set to 1008.43 1008.43 

Time values set: 2005:6:1:6 2005:6:1:6 
E set to 1 1 
ga-> open ATM.2005070100.ctl 
Scanning description file:  ATM.2005070100.ctl
Data file ATM.2005070100 is open as file 2
ga-> open ATM.2005080100.ctl 

Scanning description file:  ATM.2005080100.ctl
Data file ATM.2005080100 is open as file 3
ga-> open ATM.2005090100.ctl 
Scanning description file:  ATM.2005090100.ctl
Data file ATM.2005090100 is open as file 4


Define function 
 
1)- precipitation
 
ga-> define r1=ave(tpr.1,t=1,t=120)*30/10
Averaging.  dim = 3, start = 1, end = 120
Define memory allocation size = 133584 bytes
ga-> define r2=ave(tpr.2,t=120,t=244)*31/10
Averaging.  dim = 3, start = 120, end = 244

Data Request Warning:  Request is completely outside file limits
  Entire grid contents are set to missing data 
  Grid limits of file:     X = 1 138  Y = 1 121  Z = 1 23  T = 1 124  E = 1 1 
  Grid limits of request:  X = 1 138  Y = 1 121  Z = 1 1  T = 0 0  E = 1 1 

  Warning issued for variable = tpr.2
Define memory allocation size = 133584 bytes

ga-> define r3=ave(tpr.3,t=244,t=368)*31/10
...
..
ga-> define r4=ave(tpr.4,t=368,t=488)*30/10
..
..
ga-> define r=(r1+r2+r3+r4)
 
 
2) vector wind
 
ga-> define u1=ave(u.1,t=1,t=120)
 

 
ga-> define v1=ave(v.1,t=1,t=120)
 

ga-> define u2=ave(u.2,t=120,t=244)
 

 
ga-> define v2=ave(v.2,t=120,t=244)
 
ga-> d skip(u1,5,5);v1
..
...
..
ga-> define u=(u1+u2+u3+u4)
 
ga-> define v=(v1+v2+v3+v4)
 

-- 
Waiting for your necessary suggestion on it.
 
Thanks
Rajesh Kumar Maurya
M.Sc(Tech)- Geophysics(Meteorology); Junior Research Fellow & Research Scholar
Department of Geophysics
Banaras Hindu University
Varanasi 221005

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-------------------------------------------------------------------------------
Dr. Satyaban Bishoyi Ratna
Computational Atmospheric Sciences Team
Scientific & Engineering Computing Group
Centre for Development of Advanced Computing (C-DAC)
Pune University Campus, Ganeshkhind
Pune - 411 007, Maharashtra, India
E-mail: satyabanb at cdac.in
Tel (O): +91-020-2570 4226,  (Cell): +91-094223 56326
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