[Wrf-users] Re: Wrf-users Digest, Vol 38, Issue 21

Mon Oct 29 18:44:41 MDT 2007

I's say use the same radt for all domains. For your grid size range,  
use something like 10 or 15 min should be good.

wrfhelp

On Oct 29, 2007, at 12:00 PM, wrf-users-request at ucar.edu wrote:

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> Today's Topics:
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>    1. RADT and nesting in WRF ARW (Eric Altshuler)
>    2. wrf (Guan Song)
>    3. Re: RADT and nesting in WRF ARW (Ravan Ahmadov)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Oct 2007 12:33:52 -0400 (EDT)
> From: Eric Altshuler <ela at cola.iges.org>
> Subject: [Wrf-users] RADT and nesting in WRF ARW
> To: wrf-users at ucar.edu
> Message-ID: <1656250940.62811193675632316.JavaMail.root at mail.iges.org>
> Content-Type: text/plain; charset=utf-8
>
> Hello,
>
> When running a nested simulation in WRF ARW, is it better to use  
> one value of RADT (number of minutes between radiation calls) for  
> all domains, or should each domain have its own value of RADT  
> according to its horizontal resolution? For example, if I have the  
> following domain configuration:
>
> Domain 1 (coarse mesh) 36km
> Domain 2 (parent is domain 1) 12km
> Domain 3 (parent is domain 2) 4km
>
> should the RADT setting in namelist.input be:
>
> RADT = 36, 36, 36
>
> or should it be:
>
> RADT = 36, 12, 4
>
> The various WRF docs give conflicting information on what the  
> proper setting of RADT is in the case of nested simulations.
>
> Any comments would be appreciated.
>
> Best regards,
>
> Eric L. Altshuler
> Assistant Research Scientist
> Center for Ocean-Land-Atmosphere Studies
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705-3106
> USA
>
> E-mail: ela at cola.iges.org
> Phone: (301) 902-1257
> Fax: (301) 595-9793
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 29 Oct 2007 16:37:40 +0000
> From: Guan Song <songguan1981 at hotmail.com>
> Subject: [Wrf-users] wrf
> To: Guan Song <gs6r at virginia.edu>, wrfhelp <wrfhelp at ucar.edu>, "Users,
> 	WRF"	<wrf-users at ucar.edu>, <ncl-talk-request at ucar.edu>
> Message-ID: <BAY137-W281968C818034D23F84011C6910 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>> Hi all
>>
>> I run the idealized 2D hill case. I just changed e_sn to 302 (in  
>> namelist.input) and obtain the output.
>>
>> I used NCL to examine output.
>>
>> I wrote the script as follows, it seems work, but not in the right  
>> way. I attach the script below.I also attach the figure and the  
>> error I got.
>> I already got WRFHELP's response to remove the map call from my  
>> script.
>> ___________________________________
>> mpres=True
>> map=wrf_map(wks,a,mpres)
>>
>> wrf_map_overlay(wks,map,(/contour/),True)
>> _____________________________________
>> However if I removed the following statement,it did not work.  
>> Nothing is pop up.
>> So I have to keep these statement.
>>
>> I am not sure what is wrong with my script, and I really need your  
>> help.
>>
>> thanks a lot in advance.
>>
>> __________________________________________________________--
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
>>
>> begin
>>
>> ;WRF ARW INPUT FILE
>>
>> ;a=addfile("../wrfout_d01_2003-07-15_00-00-00.nc","r")
>> a=addfile("../public/WRFV2/run/ 
>> wrfout_d01_0001-01-01_00:00:00.nc","r")
>> type="x11"
>> wks=gsn_open_wks(type,"plt_Surface")
>> ;SET BASIC OPTIONS
>>
>> ARWres=True
>> ARWres at MainTitle="REAL-TIME WRF"
>>
>>
>> ;---------------------------------------------------------------
>> ;LETS FIND OUT HOW MANY TIMES ARE IN THE DATASETS.
>>
>> times=wrf_user_list_times(a) ; GET TIMES IN THE FILE
>> ntimes=dimsizes (times) ;NUMBER OF TIMES IN THE FILE
>>
>> do it=0,ntimes-1,10 ;WE ARE ONLY INTERESTED IN THE LAST TIME
>> ;ARWres at TimeLabel = times (it);keep some time information
>> mpres=True
>> map=wrf_map(wks,a,mpres)
>> u=wrf_user_getvar(a,"U",it)
>> v=wrf_user_getvar(a,"V",it)
>>
>> hgt=wrf_user_getvar(a,"HGT",it)
>>
>> opts=ARWres
>>
>> opts at cnMonoFillPattern =True
>> opts at cnFillOn=True
>> opts at pmLabelBarDisplayMode = "Always" ; Turn on label bar.
>> contour=wrf_contour(a,wks,u(:,:,4),opts)
>> wrf_map_overlay(wks,map,(/contour/),True)
>> end do
>> end
>> -------------------------------------------------------------------
>>
>> Copyright (C) 1995-2007 - All Rights Reserved
>> University Corporation for Atmospheric Research
>> NCAR Command Language Version 4.3.1
>> The use of this software is governed by a License Agreement.
>> See http://www.ncl.ucar.edu/ for more details.
>>
>>
>> Variable: times
>> Type: string
>> Total Size: 88 bytes
>> 11 values
>> Number of Dimensions: 1
>> Dimensions and sizes: [11]
>> Coordinates:
>> Number Of Attributes: 2
>> description : times in file
>> _FillValue : missing
>> (0) 0001-01-01_00:00:00
>> (1) 0001-01-01_01:00:00
>> (2) 0001-01-01_02:00:00
>> (3) 0001-01-01_03:00:00
>> (4) 0001-01-01_04:00:00
>> (5) 0001-01-01_05:00:00
>> (6) 0001-01-01_06:00:00
>> (7) 0001-01-01_07:00:00
>> (8) 0001-01-01_08:00:00
>> (9) 0001-01-01_09:00:00
>> (10) 0001-01-01_10:00:00
>> warning:ContourPlotInitialize: scalar field is constant;  
>> ContourPlot not possible:[errno=1102]
>>
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^
>> Best regards,
>> Guan
>>
>> ________________________________
>>
>> _________________________________________________________________
>> Peek-a-boo FREE Tricks & Treats for You!
>> http://www.reallivemoms.com?ocid=TXT_TAGHM&loc=us
>
> _________________________________________________________________
> Peek-a-boo FREE Tricks & Treats for You!
> http://www.reallivemoms.com?ocid=TXT_TAGHM&loc=us
>
> ------------------------------
>
> Message: 3
> Date: Mon, 29 Oct 2007 17:47:10 +0100
> From: Ravan Ahmadov <rahmadov at bgc-jena.mpg.de>
> Subject: Re: [Wrf-users] RADT and nesting in WRF ARW
> To: Eric Altshuler <ela at cola.iges.org>
> Cc: wrf-users at ucar.edu
> Message-ID: <47260E8E.3000003 at bgc-jena.mpg.de>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Dear Eric,
>
> As I know it's better to use the same number for all domains.
>
> Cheers,
> Ravan.
>
>
>
>
> Eric Altshuler wrote:
>> Hello,
>>
>> When running a nested simulation in WRF ARW, is it better to use  
>> one value of RADT (number of minutes between radiation calls) for  
>> all domains, or should each domain have its own value of RADT  
>> according to its horizontal resolution? For example, if I have the  
>> following domain configuration:
>>
>> Domain 1 (coarse mesh) 36km
>> Domain 2 (parent is domain 1) 12km
>> Domain 3 (parent is domain 2) 4km
>>
>> should the RADT setting in namelist.input be:
>>
>> RADT = 36, 36, 36
>>
>> or should it be:
>>
>> RADT = 36, 12, 4
>>
>> The various WRF docs give conflicting information on what the  
>> proper setting of RADT is in the case of nested simulations.
>>
>> Any comments would be appreciated.
>>
>> Best regards,
>>
>> Eric L. Altshuler
>> Assistant Research Scientist
>> Center for Ocean-Land-Atmosphere Studies
>> 4041 Powder Mill Road, Suite 302
>> Calverton, MD 20705-3106
>> USA
>>
>> E-mail: ela at cola.iges.org
>> Phone: (301) 902-1257
>> Fax: (301) 595-9793
>>
>> _______________________________________________
>> Wrf-users mailing list
>> Wrf-users at ucar.edu
>> http://mailman.ucar.edu/mailman/listinfo/wrf-users
>>
>>
>>
>
>
> -- 
> Yours sincerely,
> Dr. Ravan Ahmadov
>
> *************************************************************
> Postdoc at Max-Planck-Institute for Biogeochemistry
>
> Mailing Address:
> P.O.Box 100164, 07701 Jena, Germany
>
> Phone:    +49 3641 576361
> Fax:      +49 3641 577300
> E-mail:   rahmadov at bgc-jena.mpg.de
> Web page: www.bgc-jena.mpg.de/~ravan.ahmadov
> *************************************************************
>
>
>
>
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> End of Wrf-users Digest, Vol 38, Issue 21
> *****************************************