[ARPSSUPPORT] wrf2arps

[Yunheng Wang]

Hi,

The default parameters in file input/wrf2arps.input are what we recommend.

Keith,

Do you have anything others to comment since it is the same set of 
parameters used with "ext2arps"?

Yunheng.



----- 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



>  Hello,
>
>   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
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