Difference between real grid dimension and ARWpost grid

Discussions related to the use of ARWPost

Difference between real grid dimension and ARWpost grid

Postby rabah » Mon Feb 28, 2011 8:39 am

Hello All,

When i use ARWpost to plot WRF outputs ,
I noticed he had a difference in the size of the grid files netcdf
and the output of ARWpost ctl. dat files.
there is a header of netcdf output :
===========================================
// global attributes:
:TITLE = " OUTPUT FROM WRF V3.1 MODEL" ;
:START_DATE = "2011-02-28_00:00:00" ;
:SIMULATION_START_DATE = "2011-02-28_00:00:00" ;
:WEST-EAST_GRID_DIMENSION = 140 ;
:SOUTH-NORTH_GRID_DIMENSION = 160 ;
:BOTTOM-TOP_GRID_DIMENSION = 28 ;
:DX = 20000.f ;
:DY = 20000.f ;
:GRIDTYPE = "C" ;
:DIFF_OPT = 0 ;
:KM_OPT = 0 ;
:DAMP_OPT = 3 ;
:DAMPCOEF = 0.2f ;
=======================================================
and .ctl file
=======================================================
dset ^jour.dat
options byteswapped
undef 1.e30
title OUTPUT FROM WRF V3.1 MODEL
pdef 139 159 lcc 32.000 2.000 70.000 80.000 60.00000 30.00000 -18.00000 20000.000 20000.000
xdef 432 linear -14.63611 0.09009009
ydef 388 linear 14.44415 0.09009009
zdef 27 linear 1 1
tdef 9 linear 00Z28FEB2011 360MN
VARS 97
LU_INDEX 1 0 LAND USE CATEGORY (-)
U 27 0 x-wind component (m s-1)
V 27 0 y-wind component (m s-1)
W 27 0 z-wind component (m s-1)
PH 27 0 perturbation geopotential (m2 s-2)
PHB 27 0 base-state geopotential (m2 s-2)
T 27 0 perturbation potential temperature (theta-t0) (K)
MU 1 0 perturbation dry air mass in column (Pa)
MUB 1 0 base state dry air mass in column (Pa)
NEST_POS 1 0 - (-)
P 27 0 perturbation pressure (Pa)
PB 27 0 BASE STATE PRESSURE (Pa)
SR 1 0 fraction of frozen precipitation (-)
POTEVP 1 0 accumulated potential evaporation (W m-2)
SNOPCX 1 0 snow
==============================================================
my initial grid is 140 by 160 points with 20Km resolution
and in .ctl file i see : ga> q dims
Default file number is: 1
X is varying Lon = -14.6361 to 24.1927 X = 1 to 432
Y is varying Lat = 14.4442 to 49.309 Y = 1 to 388
Z is fixed Lev = 1 Z = 1
T is fixed Time = 00Z28FEB2011 T = 1
E is fixed Ens = 1 E = 1

432 by 388 with 0.09° resolution


Any suggestions or response to this query .....

Thank you all
rabah
 
Posts: 13
Joined: Tue Jan 27, 2009 3:13 pm

Re: Difference between real grid dimension and ARWpost grid

Postby thomas2 » Fri Mar 04, 2011 3:39 am

I implemented a switch in the public release of ARWpost:

put
Code: Select all
grads_low_res = .true.

in the io section of namelist.ARWpost

Thomas
thomas2
 
Posts: 75
Joined: Mon Sep 01, 2008 4:56 am


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