[Wrf-users] Pls reply to my query

[Geeta Geeta]

Hi. 
I have to compute areal average RF for a domain 9-22/74-87. 
I am sending you the WRFPRS files and nc file.   
So I have to compute area average rainfall from wrf output.  I have two software's Grads and NCL for doing this job. 

ga-> open 2011070100-27.ctl
Scanning description file:  2011070100-27.ctl
Data file WRFPRS_d01.027 is open as file 1
LON set to 73.943 87.057
LAT set to 9.097 21.711
LEV set to 1000 1000
Time values set: 2011:6:1:3 2011:6:1:3
ga-> open 2011070100-03.ctl
Scanning description file:  2011070100-03.ctl
Data file WRFPRS_d01.003 is open as file 2

ga-> define rain=apcpsfc.1-apcpsfc.2
Define memory allocation size = 106928 bytes
ga-> d aave(rain,lon=74,lon=87,lat=9,lat=22)
Result value = 2.87697

using
 Grads, I get Area Average Rf as 2.87697. ( this is after wrfout file is
 post-processed using ARWpost and then Grads is used). 

2nd Approach.  When I use NCL. I have netcdf file (model24_2011070100.nc).

NCAR Command Language Version 5.0.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
 
 
Variable: data
Type: float
Total Size: 106276 bytes
            26569 values
Number of Dimensions: 2
Dimensions and sizes:   [lat | 163] x [lon | 163]
Coordinates:
Number Of Attributes: 12
  name :        APCP
  long_name :   Total precipitation
  level :       A24
  units :       kg/m^2
  grib_code :   61
  _FillValue :  -9999
  init_time :   20110701_000000
  init_time_ut :        1309478400
  valid_time :  20110702_030000
  valid_time_ut :       1309575600
  accum_time :  240000
  accum_time_sec :      86400
 
 
Variable: rf_average
Type: float
Total Size: 4 bytes
            1 values
Number of Dimensions: 1
Dimensions and sizes:   [1]
Coordinates:
Number Of Attributes: 1
  _FillValue :  -9999
(0)     2.793683
bash-3.2$

So there is difference in answer. Kindly explain.
thanks
geeta



 		 	   		  
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