[Wrf-users] ndown producing artifacts in terrain field [SEC=UNCLASSIFIED]

[Chris.Thomas at ga.gov.au]

Oriol,

I had different values of i_parent_start and j_parent_start in my namelist.wps from those in namelist.input, and this caused the problem for me. Now it seems to be doing ok. Note that you will get some blending though. The boundaries of the fine domain will have topography which is a blend of that from the coarse domain and the fine domain.

Chris

-----Original Message-----
From: oriol jorba [mailto:oriol.jorba at bsc.es]
Sent: Thursday, 9 July 2009 6:31 PM
To: Thomas Chris
Subject: Re: [Wrf-users] ndown producing artifacts in terrain field [SEC=UNCLASSIFIED]


Hi Chris, I find the same problem as you, can explain me how did you solve it? I use:

 &bdy_control
 spec_bdy_width                      = 5,


Regards,

Oriol





Chris.Thomas at ga.gov.au escribió:
> Hello,
>
> Don't waste your time on this one, wrf-help pointed out to me the
> inconsistency in my namelists. Sorry for the silly post.
>
> Chris
>
>     -----Original Message-----
>     *From:* wrf-users-bounces at ucar.edu
>     [mailto:wrf-users-bounces at ucar.edu] *On Behalf Of *Thomas Chris
>     *Sent:* Friday, 12 June 2009 12:41 PM
>     *To:* wrf-users at ucar.edu
>     *Subject:* [Wrf-users] ndown producing artifacts in terrain field
>     [SEC=UNCLASSIFIED]
>
>     Hello,
>
>     In trying to use ndown to do a one way nested run I encounter what
>     appears to be artifacts in the HGT field. I have attached three
>     image files (screenshots from ncview) which illustrate this. To
>     help you orient the images, the nest is at the eastern end of the
>     central mountain range which is visible in the screenshot of the
>     parent domain.
>
>     wrfinput_d01.pdf is the output of real.exe for the parent domain
>     (this is Tasmania by the way)
>     wrfndi_d02.pdf is the output of real.exe for the nest
>     wrfinput_d02.pdf is the output of ndown.exe
>
>     Note the artifacts on the boundary of wrfinput_d02, most
>     noticeable on the north and east boundaries.
>
>     I understand that WRF does some blending of the terrain at the
>     boundaries of the nests. However it is clear from the parent
>     terrain that this is not simply blending.
>
>     I have also attached my namelists in case anyone would like to
>     attempt to reproduce this problem.
>
>     Can anyone shed some light on this?
>
>     Regards
>
>     Chris
>
>
>
>
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-- ______________________________________________________________________

Dr. Oriol Jorba Casellas
Earth Sciences Department
Barcelona Supercomputing Center - Centro Nacional de Supercomputación Edificio Nexus II c/ Jordi Girona 29, 08034 Barcelona, Spain

phone +34 934134050 fax +34 934137721
mail to: oriol.jorba at bsc.es

BSC web page: http://www.bsc.es/ ______________________________________________________________________