Thanks David and Denis,
I tried the code, it ran fine and interpolated the ECMWF data to WRF grid but dumped "_" in most of the interpolated grid domain. Well, '_' is not a default missing value, i checked ecmwf variable before interpolation, it does not contain any '_' or missing data but after interpolation xgrd had the data in the following form:
T2M =
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, 305.5426, 305.4818,
305.4208, 305.3597, 305.2985, 305.2372, 305.1757, 305.114, 305.0522,
304.9902, 304.9281, 304.8658, 304.8033, 304.7407, 304.6779, 304.615,
304.5568, 304.6154, 304.6741, 304.733, 304.7921, 304.8513, 304.9108,
304.9704, 305.0303, 305.0903, 305.1505, 305.2109, 305.2716, 305.3325,
305.3935, 305.4547, 305.5163, 305.5607, 305.5962, 305.6317, 305.6672,
305.7028, 305.7383, 305.7739, 305.8095, 305.8451, 305.8807, 305.9164,
305.952, 305.9877, 306.0234, 306.0592, 306.0949, 306.111, 306.0729,
306.0346, 305.9962, 305.9576, 305.9188, 305.8799, 305.8408, 305.8015,
305.7621, 305.7225, 305.6827, 305.6427, 305.6025, 305.5622, 305.5216,
305.4809, 305.4523, 305.4257, 305.3994, 305.3732, 305.3473, 305.3217,
305.2962, 305.271, 305.246, 305.2213, 305.1969, 305.1726, 305.1487,
305.125, 305.1015, 305.0783, 305.0619, 305.0533, 305.0447, 305.0362,
305.0279, 305.0196, 305.0115, 305.0035, 304.9956, 304.9878, 304.9802,
304.9726, 304.9651, 304.9579, 304.9507, 304.9436, 304.9363, 304.9231,
304.9098, 304.8964, 304.8828, 304.8692, 304.8555, 304.8416, 304.8277,
304.8136, 304.7994, 304.7852, 304.7708, 304.7563, 304.7416, 304.7269,
304.712, 304.7005, 304.6913, 304.6819, 304.6724, 304.6627, 304.6528,
304.6427, 304.6324, 304.6219, 304.6111, 304.6002, 304.5891, 304.5777,
304.5662, 304.5544, 304.5424, 304.5343, 304.5432, 304.5517, 304.56,
304.568, 304.5757, 304.583, 304.5901, 304.5968, 304.6033, 304.6094,
304.6153, 304.6208, 304.6259, 304.6308, 304.6354, 304.6396, 304.6326,
304.6216, 304.6103, 304.5988, 304.5869, 304.5749, 304.5625, 304.5499,
304.537, 304.5238, 304.5104, 304.4966, 304.4826, 304.4683, 304.4537,
304.4389, 304.4266, 304.422, 304.4177, 304.4138, 304.4102, 304.4071,
304.4043, 304.4019, 304.4, 304.3984, 304.3973, 304.3965, 304.3961,
304.3962, 304.3967, 304.3976, 304.3988, 304.4434, 304.4978, 304.5516,
304.6049, 304.6577, 304.7099, 304.7616, 304.8128, 304.8634, 304.9135,
304.963, 305.012, 305.0605, 305.1083, 305.1556, 305.2024, 305.2323,
305.2268, 305.2212, 305.2155, 305.2096, 305.2037, 305.1976, 305.1914,
305.1851, 305.1787, 305.1721, 305.1656, 305.1588, 305.1519, 305.1449,
305.1378, 305.1305, 305.1208, 305.1106, 305.1005, 305.0904, 305.0804,
305.0704,
I am using the following code:
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
begin
wrf_grid = addfile("/project/k14/basit/wrf-sims/wrf_164/20060520.nc","r")
lat2d = wrf_grid->XLAT(0,:,:)
lon2d = wrf_grid->XLONG(0,:,:)
era_file = addfile("/project/k14/basit/wrf-sims/wrf_164/ei_oper_an_sfc_075x075_20060427_20060620.nc","r")
t2m = era_file->2T_GDS0_SFC(:,:,:) ; get T2m (var 167)
g0_lat_1 = era_file->g0_lat_1(:)
g0_lon_2 = era_file->g0_lon_2(:)
; invert latitudes for rgrid2rcm
t2m = t2m(:,::-1,:)
g0_lat_1 = g0_lat_1(::-1)
printVarSummary(t2m)
printVarSummary(g0_lat_1)
printVarSummary(g0_lon_2)
f = addfile("t2m_erai-wrfgridX.nc","c") ; Create blank file to write to
g0_lat_1!0= "south_north"
g0_lon_2!0= "west_east"
g0_lat_1@units="degree_north"
g0_lon_2@units="degree_east"
xgrd = rgrid2rcm_Wrap(t2m&g0_lat_1, t2m&g0_lon_2, t2m, lat2d, lon2d, 0)
xgrd!0 = "Time" ; restore meta data
xgrd!1 = "south_north"
xgrd!2 = "west_east"
printVarSummary(xgrd)
filedimdef(f,"time",-1,True)
f->T2M = xgrd(:,:,:)
end
One thing that i noticed is that the longitude array g0_lon_2 is from 0 to 360 which is different from WRF. I tried to change 0 - 360 longitude array to make it consistent with wrf by applying the following, but this also did not have any effect on the outcome.
dimsLon = dimsizes(g0_lon_2)
g0_lon_2X = new((/dimsLon/),float)
do i = 0, dimsLon-1, 1
if(g0_lon_2(i) .le. 180) then
g0_lon_2X(i) = g0_lon_2(i)
else
g0_lon_2X(i) = g0_lon_2(i) - 360
end if
end do
delete(g0_lon_2)
g0_lon_2 = g0_lon_2X
So, I guess, the problem lies somewhere else. I would greatly appreciate if you could suggest some tip/solution. I've not yet tried ESMF regrid method suggested by Denis Shea though.
Cheers,
----
Basit A. Khan, Ph.D.
Postdoctoral Research Fellow
Division of Physical Sciences & Engineering
Office# 3204, Level 3, Building 1,
King Abdullah University of Science & Technology
4700 King Abdullah Blvd, Box 2753, Thuwal 23955 –6900,
Kingdom of Saudi Arabia.
Office: +966(0)2 808 0276, Mobile: +966(0)5 0860 3617
E-mail: basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa>
Skype name: basit.a.khan
From: David Jones <jonesd647@yahoo.ca<mailto:jonesd647@yahoo.ca>>
Reply-To: David Jones <jonesd647@yahoo.ca<mailto:jonesd647@yahoo.ca>>
Date: Sun, 27 Jan 2013 11:39:39 -0800
To: "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>" <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>, KAUST <basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa>>
Subject: Re: regridding of ECMWF to WRF grid
You could also try using the NCL function "rgrid2rcm" like in the script below.
I've used this for ERA-I data before.
Dave.
======================================================
; interpolation script
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
begin
wrf_grid = addfile("wrfout_d01_2001-12-24_00:00:00.nc","r")
lat2d = wrf_grid->XLAT(0,:,:)
lon2d = wrf_grid->XLONG(0,:,:)
files = asciiread("erai_files.asc",-1,"string") ; -1 for all
print(files)
erai_grid = addfiles(files,"r")
t2m = erai_grid[:]->2T_GDS4_SFC(:,:,:)
printVarSummary(t2m)
t2m = t2m(:,::-1,:) ; INVERT LATITUDES FOR rgrid2rcm
printVarSummary(t2m)
g4_lat_1 = erai_grid[:]->g4_lat_1(:)
printVarSummary(g4_lat_1)
g4_lat_1 = g4_lat_1(::-1)
printVarSummary(g4_lat_1)
g4_lon_2 = erai_grid[:]->g4_lon_2(:)
f = addfile("t2m_erai-wrfgrid.nc","c") ; Create blank file to write to
;xgrd = rgrid2rcm(x&lat, x&lon, x, lat2d, lon2d, 0)
xgrd = rgrid2rcm_Wrap(t2m&g4_lat_1, t2m&g4_lon_2, t2m, lat2d, lon2d, 0)
xgrd!0 = "Time" ; restore meta data
xgrd!1 = "south_north"
xgrd!2 = "west_east"
printVarSummary(xgrd)
filedimdef(f,"time",-1,True)
f->T2M = xgrd(:,:,:)
end
=====================================================
________________________________
From: "ncl-talk-request@ucar.edu<mailto:ncl-talk-request@ucar.edu>" <ncl-talk-request@ucar.edu<mailto:ncl-talk-request@ucar.edu>>
To: ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>
Sent: Sunday, January 27, 2013 8:00:04 PM
Subject: ncl-talk Digest, Vol 110, Issue 33
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Today's Topics:
1. Re: How to define the rec_type in the function of fbinrecread
to read a special binary file (Guangshan Chen)
2. Re: How to define the rec_type in the function of fbinrecread
to read a special binary file (shea@ucar.edu<mailto:shea@ucar.edu>)
3. Re: How to define the rec_type in the function of fbinrecread
to read a special binary file (Guangshan Chen)
4. regridding of ECMWF to WRF grid (BasitAli Khan)
5. Re: regridding of ECMWF to WRF grid (BasitAli Khan)
6. Re: regridding of ECMWF to WRF grid (shea@ucar.edu<mailto:shea@ucar.edu>)
----------------------------------------------------------------------
Message: 1
Date: Sat, 26 Jan 2013 19:19:22 -0600
From: Guangshan Chen <gchen9@gmail.com<mailto:gchen9@gmail.com>>
Subject: Re: How to define the rec_type in the function of
fbinrecread to read a special binary file
To: Dennis Shea <shea@ucar.edu<mailto:shea@ucar.edu>>
Cc: "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu> NCL" <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Message-ID: <EB1B55CD-DCAD-4D64-964E-B7A743E45D54@gmail.com<mailto:EB1B55CD-DCAD-4D64-964E-B7A743E45D54@gmail.com>>
Content-Type: text/plain; charset=iso-8859-1
Dear Dennis and Dave,
Thanks for the suggestion.
It does not work.
Hopeful NCL can read read multiple types at a time one day!
Guangshan
On Jan 25, 2013, at 2:31 PM, Dennis Shea <shea@ucar.edu<mailto:shea@ucar.edu>> wrote:
> NCL's fbin*read functions can only read one type at a time/
>
> fili = "example01"
> ii = fbinrecread(fili, 0, 3, "integer")
> rr = fbinrecread(fili, 0, 3, "float" )
>
> a = ii(0)
> b = rr(1)
> c = rr(2)
>
> Good luck
>
> On 01/25/2013 09:17 AM, Guangshan Chen wrote:
>> Dear all,
>>
>> I have a binary file. It is written as the following in the fortran code:
>>
>> integer a
>> real b,c
>>
>> a=10
>> b=20.0
>> c=30.0
>>
>> open(11, file="example01", form="unformatted")
>> write(11) a, b, c
>>
>>
>> There is only record in this binary file. If I would like to use fbinrecread to read
>> finrecread("example01", 0, 3, ????). How to define the rec_type?
>>
>> a is integer, b and c are real.
>>
>> Thanks for any help.
>>
>> Guangshan
>>
>> _______________________________________________
>> ncl-talk mailing list
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>
------------------------------
Message: 2
Date: Sat, 26 Jan 2013 19:38:13 -0700
From: shea@ucar.edu<mailto:shea@ucar.edu>
Subject: Re: How to define the rec_type in the function of
fbinrecread to read a special binary file
To: "Guangshan Chen" <gchen9@gmail.com<mailto:gchen9@gmail.com>>
Cc: "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu> NCL" <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Message-ID:
<7a1ed3f797131e150d70b790c8c4bd1f.squirrel@webmail.cgd.ucar.edu<mailto:7a1ed3f797131e150d70b790c8c4bd1f.squirrel@webmail.cgd.ucar.edu>>
Content-Type: text/plain;charset=iso-8859-1
The outlined approch has worked on multiple machines and operating systems.
Perhaps the fortran sequential file was created on a 'big-endian' machine
and you are reading on a little-endian machine or vice versa.
There is no automatic way to test. It is the user's responsibility to use
thr sppropriate 'setfileoption' .
> Dear Dennis and Dave,
>
> Thanks for the suggestion.
>
> It does not work.
>
> Hopeful NCL can read read multiple types at a time one day!
>
> Guangshan
>
> On Jan 25, 2013, at 2:31 PM, Dennis Shea <shea@ucar.edu<mailto:shea@ucar.edu>> wrote:
>
>> NCL's fbin*read functions can only read one type at a time/
>>
>> fili = "example01"
>> ii = fbinrecread(fili, 0, 3, "integer")
>> rr = fbinrecread(fili, 0, 3, "float" )
>>
>> a = ii(0)
>> b = rr(1)
>> c = rr(2)
>>
>> Good luck
>>
>> On 01/25/2013 09:17 AM, Guangshan Chen wrote:
>>> Dear all,
>>>
>>> I have a binary file. It is written as the following in the fortran
>>> code:
>>>
>>> integer a
>>> real b,c
>>>
>>> a=10
>>> b=20.0
>>> c=30.0
>>>
>>> open(11, file="example01", form="unformatted")
>>> write(11) a, b, c
>>>
>>>
>>> There is only record in this binary file. If I would like to use
>>> fbinrecread to read
>>> finrecread("example01", 0, 3, ????). How to define the rec_type?
>>>
>>> a is integer, b and c are real.
>>>
>>> Thanks for any help.
>>>
>>> Guangshan
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>
>
------------------------------
Message: 3
Date: Sat, 26 Jan 2013 20:41:21 -0600
From: Guangshan Chen <gchen9@gmail.com<mailto:gchen9@gmail.com>>
Subject: Re: How to define the rec_type in the function of
fbinrecread to read a special binary file
To: shea@ucar.edu<mailto:shea@ucar.edu>
Cc: "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu> NCL" <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Message-ID: <42A91B9A-015E-4323-8044-32133DEC2CE1@gmail.com<mailto:42A91B9A-015E-4323-8044-32133DEC2CE1@gmail.com>>
Content-Type: text/plain; charset=iso-8859-1
Dear Dennis,
Thanks.
It was created on a "big-endian" machine. I have set the setfileoption to read big-endian.
Guangshan
On Jan 26, 2013, at 8:38 PM, shea@ucar.edu<mailto:shea@ucar.edu> wrote:
> The outlined approch has worked on multiple machines and operating systems.
>
> Perhaps the fortran sequential file was created on a 'big-endian' machine
> and you are reading on a little-endian machine or vice versa.
>
> There is no automatic way to test. It is the user's responsibility to use
> thr sppropriate 'setfileoption' .
>
>> Dear Dennis and Dave,
>>
>> Thanks for the suggestion.
>>
>> It does not work.
>>
>> Hopeful NCL can read read multiple types at a time one day!
>>
>> Guangshan
>>
>> On Jan 25, 2013, at 2:31 PM, Dennis Shea <shea@ucar.edu<mailto:shea@ucar.edu>> wrote:
>>
>>> NCL's fbin*read functions can only read one type at a time/
>>>
>>> fili = "example01"
>>> ii = fbinrecread(fili, 0, 3, "integer")
>>> rr = fbinrecread(fili, 0, 3, "float" )
>>>
>>> a = ii(0)
>>> b = rr(1)
>>> c = rr(2)
>>>
>>> Good luck
>>>
>>> On 01/25/2013 09:17 AM, Guangshan Chen wrote:
>>>> Dear all,
>>>>
>>>> I have a binary file. It is written as the following in the fortran
>>>> code:
>>>>
>>>> integer a
>>>> real b,c
>>>>
>>>> a=10
>>>> b=20.0
>>>> c=30.0
>>>>
>>>> open(11, file="example01", form="unformatted")
>>>> write(11) a, b, c
>>>>
>>>>
>>>> There is only record in this binary file. If I would like to use
>>>> fbinrecread to read
>>>> finrecread("example01", 0, 3, ????). How to define the rec_type?
>>>>
>>>> a is integer, b and c are real.
>>>>
>>>> Thanks for any help.
>>>>
>>>> Guangshan
>>>>
>>>> _______________________________________________
>>>> ncl-talk mailing list
>>>> List instructions, subscriber options, unsubscribe:
>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>
>>>
>>
>>
>
>
------------------------------
Message: 4
Date: Sun, 27 Jan 2013 09:25:08 +0000
From: BasitAli Khan <BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa>>
Subject: regridding of ECMWF to WRF grid
To: "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>" <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Message-ID:
<5B0AEC9F228B0E4093880B97E72BBDCE9D1710@WTHEMXND03.KAUST.EDU.SA<mailto:5B0AEC9F228B0E4093880B97E72BBDCE9D1710@WTHEMXND03.KAUST.EDU.SA>>
Content-Type: text/plain; charset="us-ascii"
Hello,
I want to regrid Era Interim Reanalysis data (0.75 x 0.75 deg) to my high resolution WRF gird (3 km). Just wondering which regridding/interpolation function is best to use for this purpose. I know there are heaps of functions and regridding scripts available but could not find anything that suits my requirement. WRF has a curvilinear grid while Era-Interim Re-analysis (if i am not wrong) uses Gaussian grid. I would greatly appreciate if anyone have the script and would like to share it.
Thanks in advance
Best regards,
basit
________________________________
This message and its contents including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email.
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------------------------------
Message: 5
Date: Sun, 27 Jan 2013 11:23:25 +0000
From: BasitAli Khan <BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa>>
Subject: Re: regridding of ECMWF to WRF grid
To: "bjfisel@gmail.com<mailto:bjfisel@gmail.com>" <bjfisel@gmail.com<mailto:bjfisel@gmail.com>>, "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>"
<ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Message-ID:
<5B0AEC9F228B0E4093880B97E72BBDCE9D1724@WTHEMXND03.KAUST.EDU.SA<mailto:5B0AEC9F228B0E4093880B97E72BBDCE9D1724@WTHEMXND03.KAUST.EDU.SA>>
Content-Type: text/plain; charset="windows-1252"
Hi,
That's right, its generally an easy fix, however, unfortunately WPS does not interpolate all the Era-Interim variables to WRF grid e.g T2, U10 and V10. To output these vars i probably would need to make changes in V-table and/or at some other places and may also need to recompile WPS. I am not sure if i can take values of the first level of TT, UU and VV from met_em_d0* with any degree of confidence but i would appreciate if you could share your experience on this.
Cheers,
----
Basit A. Khan, Ph.D.
Postdoctoral Research Fellow
Division of Physical Sciences & Engineering
Office# 3204, Level 3, Building 1,
King Abdullah University of Science & Technology
4700 King Abdullah Blvd, Box 2753, Thuwal 23955 ?6900,
Kingdom of Saudi Arabia.
Office: +966(0)2 808 0276, Mobile: +966(0)5 0860 3617
E-mail: basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa><mailto:basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa>>
Skype name: basit.a.khan
From: "bjfisel@gmail.com<mailto:bjfisel@gmail.com><mailto:bjfisel@gmail.com<mailto:bjfisel@gmail.com>>" <bjfisel@gmail.com<mailto:bjfisel@gmail.com><mailto:bjfisel@gmail.com<mailto:bjfisel@gmail.com>>>
Date: Sun, 27 Jan 2013 05:09:10 -0600
To: KAUST <basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa><mailto:basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa>>>
Subject: Re: regridding of ECMWF to WRF grid
Hi,
You should ingest the ECMWF data into the WRF Preprocessing System (WPS), which will put the data on the WRF 3-km grid. There is no need to regrid.
On Jan 27, 2013, at 3:25, BasitAli Khan <BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa><mailto:BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa>>> wrote:
Hello,
I want to regrid Era Interim Reanalysis data (0.75 x 0.75 deg) to my high resolution WRF gird (3 km). Just wondering which regridding/interpolation function is best to use for this purpose. I know there are heaps of functions and regridding scripts available but could not find anything that suits my requirement. WRF has a curvilinear grid while Era-Interim Re-analysis (if i am not wrong) uses Gaussian grid. I would greatly appreciate if anyone have the script and would like to share it.
Thanks in advance
Best regards,
basit
________________________________
This message and its contents including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email.
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Message: 6
Date: Sun, 27 Jan 2013 08:28:00 -0700
From: shea@ucar.edu<mailto:shea@ucar.edu>
Subject: Re: regridding of ECMWF to WRF grid
To: "BasitAli Khan" <BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa>>
Cc: "ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>" <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Message-ID:
<f83aabad438e5ab23a9bb29a3d4a54ea.squirrel@webmail.cgd.ucar.edu<mailto:f83aabad438e5ab23a9bb29a3d4a54ea.squirrel@webmail.cgd.ucar.edu>>
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rectilinear [ECMWF] to curvilinear [WRF]: You could use ESMF regrid
example 9 and (say) example 20 as a start. Generating the weight file may
take some time but, once the weight file is generated, the actual
regridding is quite fast.
> Hi,
> That's right, its generally an easy fix, however, unfortunately WPS does
> not interpolate all the Era-Interim variables to WRF grid e.g T2, U10 and
> V10. To output these vars i probably would need to make changes in V-table
> and/or at some other places and may also need to recompile WPS. I am not
> sure if i can take values of the first level of TT, UU and VV from
> met_em_d0* with any degree of confidence but i would appreciate if you
> could share your experience on this.
>
> Cheers,
> ----
> Basit A. Khan, Ph.D.
> Postdoctoral Research Fellow
> Division of Physical Sciences & Engineering
> Office# 3204, Level 3, Building 1,
> King Abdullah University of Science & Technology
> 4700 King Abdullah Blvd, Box 2753, Thuwal 23955 ?6900,
> Kingdom of Saudi Arabia.
>
> Office: +966(0)2 808 0276, Mobile: +966(0)5 0860 3617
> E-mail: basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa><mailto:basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa>>
> Skype name: basit.a.khan
>
> From: "bjfisel@gmail.com<mailto:bjfisel@gmail.com><mailto:bjfisel@gmail.com<mailto:bjfisel@gmail.com>>"
> <bjfisel@gmail.com<mailto:bjfisel@gmail.com><mailto:bjfisel@gmail.com<mailto:bjfisel@gmail.com>>>
> Date: Sun, 27 Jan 2013 05:09:10 -0600
> To: KAUST <basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa><mailto:basitali.khan@kaust.edu.sa<mailto:basitali.khan@kaust.edu.sa>>>
> Subject: Re: regridding of ECMWF to WRF grid
>
> Hi,
>
> You should ingest the ECMWF data into the WRF Preprocessing System (WPS),
> which will put the data on the WRF 3-km grid. There is no need to regrid.
>
>
> On Jan 27, 2013, at 3:25, BasitAli Khan
> <BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa><mailto:BasitAli.Khan@kaust.edu.sa<mailto:BasitAli.Khan@kaust.edu.sa>>> wrote:
>
> Hello,
>
> I want to regrid Era Interim Reanalysis data (0.75 x 0.75 deg) to my
> high resolution WRF gird (3 km). Just wondering which
> regridding/interpolation function is best to use for this purpose. I know
> there are heaps of functions and regridding scripts available but could
> not find anything that suits my requirement. WRF has a curvilinear grid
> while Era-Interim Re-analysis (if i am not wrong) uses Gaussian grid. I
> would greatly appreciate if anyone have the script and would like to share
> it.
>
> Thanks in advance
> Best regards,
> basit
>
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