ywang at gcn.ou.edu
Thu Sep 24 09:28:53 CDT 2009
The default parameters in file input/wrf2arps.input are what we recommend.
Do you have anything others to comment since it is the same set of
parameters used with "ext2arps"?
----- Original Message -----
*From:* Ivar Lie <ivli at online.no>
*To:* arpssupport at ou.edu
*Sent:* 09/23/2009 3:49:02 AM -0500
*Subject:* [ARPSSUPPORT] wrf2arps
> We are using wrf2arps to produce initial and boundary data for ARPS.
> However, running ARPS with 1 km resolution based on WRF at 3 km,
> the vertical velocity explodes after a few
> timesteps. I guess that the initial w field is somewhat out of balance,
> so I have a few questions regarding the interpolation and the
> adjustment to the fields:
> 1) The options ext_lbc sets zero gradient BCs to the lateral boundaries
> for all wind components, and ext_vbc the top and bottom BCs to w.
> These two operations are done in a slightly different way, so I was
> wandering if you recommend that these options be set and what
> reasonable values of tbc anf bbc would be.
> 2) The options intropt and nsmooth. What value should one use for
> intropt, and what is a reasonable value for nsmooth ?
> 3) Is there any point in using hydradj =/ 0 ?
> 4) The options wndadj and obropt (and obrzero). wndadj actually changes
> the w field, so I was wondering what would be reasonable values of
> these options.
> -------- Regards,
> Ivar Lie
> ARPSSUPPORT mailing list
> ARPSSUPPORT at caps.ou.edu
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