Re: ESMF_regrid

From: <jokalebo_at_nyahnyahspammersnyahnyah>
Date: Tue Sep 11 2012 - 10:34:07 MDT

Dennis,

Please see the enclosed code. I am using ESMF_regrid_16.ncl (http://www.ncl.ucar.edu/Applications/ESMF.shtml) which appears to me to be the closest code when regridding the WRF (12 km) (curvilinear) to NARR resolution (32 km) (curvilinear too). Both are of Lambert Conformal Projection. Do you recommend this code or should I use a different example?

I also changed the interpolation method to "conserve".
I have not gotten it to run yet as I am meanwhile awaiting for some help with missing libaries (libssl.so.6 and
libldap-2.3.so.0) to run the NCL Version 6.1.0-beta.
Thanks.

Jane Okalebo
PhD student
HPRCC, School of Natural Resources
University of Nebraska-Lincoln
249 Hardin Hall
3310 Holdrege,
Lincoln, Nebraska 68583-0749 U.S.A.

________________________________________
From: Dennis Shea [shea@ucar.edu]
Sent: Tuesday, September 11, 2012 7:42 AM
To: jokalebo@huskers.unl.edu
Cc: ncl-talk@ucar.edu
Subject: Re: ESMF_regrid

Yes. Interpolate the high resolution (PRISM & WRF) to the low
resolution NARR grid. Since precipitation does not have
a high degree of spatial correllation you should use
the ESMF's conservative regridding method.

On 9/11/12 2:04 AM, jokalebo@huskers.unl.edu wrote:
> *I need some advise please with regard to regridding.*
>
> *I have 3 different data files (rectilinear and curvilinear) with
> different resolutions: *
>
> *
> *PRISM is gridded data (cellsize is 0.041667 decimal degrees), *
> *
> *WRF (curvilinear dx= 12 km by dy = 12 km), and *
> *
> *NARR 0.3 degrees (32km) resolution***
>
> *I want to compare a variable (precipitation) over a specific region
> (namely Nebraska).*
>
> *Should I regrid from high to low resolution (WRF and PRISM - source
> files) and NARR (destination)???*
>
> *Kindly give me some tips.*
>
> *Thanks.*
>
> **
>
> *Jane*
>
> **
>
> **
>
> **
>
> **
>
> *PRISM (rectilinear) *
>
> **
>
> *ncols 1405*
>
> *nrows 621*
>
> *xllcorner -125.020833*
>
> *yllcorner 24.062500*
>
> *cellsize 0.041667*
>
> *NODATA_value -9999*
>
> **
>
> *0.041667 decimal degrees = 4.625037 km*
>
> **
>
> **
>
> *Wrf (curvilinear)*
>
> **
>
> *DY : 12000*
>
> *DX : 12000*
>
> BOTTOM-TOP_GRID_DIMENSION : 28
>
> SOUTH-NORTH_GRID_DIMENSION : 61
>
> WEST-EAST_GRID_DIMENSION : 74
>
> SIMULATION_START_DATE : 2008-01-01_00:00:00
>
> START_DATE : 2008-03-31_21:00:00
>
> TITLE : UNL RCMF WRF daily archive
>
> dimensions:
>
> time = 30// unlimited
>
> pres_lev = 11
>
> south_north = 60
>
> west_east = 73
>
> soil_layers = 4
>
> **
>
> *narr (curvilinear)*
>
> **
>
> The grid resolution is 349x277 which is approximately *0.3 degrees
> (32km) resolution* at the lowest latitude.
>
> Jane Okalebo
> PhD student
> HPRCC, School of Natural Resources
> University of Nebraska-Lincoln
> 249 Hardin Hall
> 3310 Holdrege,
> Lincoln, Nebraska 68583-0749 U.S.A.
>
>
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Received on Tue Sep 11 10:34:38 2012

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