WRFDA for nested domains

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jorge_p
Posts: 8
Joined: Tue Nov 20, 2018 3:45 pm

WRFDA for nested domains

Post by jorge_p » Thu Mar 07, 2019 5:28 pm

Hi,
I've been searching the forum and documentation but still no luck for a more detailed explanation of running 4dvar for both the parent and nested domains of a WRF forecast simulation setup.

It's clear that no nesting is supported in WRFDA and one must separately run 4dvar for each domain.

After running real.exe for a 2 way nested run you get the wrfbdy_d01 boundary file only for the parent domain, needed for the assimilation together with wrfinput_d01.
1. How do we continue with the nested domains? Which boundary conditions file wrfbdy_d0? do we use for the nested domains.
Are the namelist.input options grid_id, parent_id, i&j_parent_start relevant when assimilating data over the nested domains?
2. Do we have to use ndown to provide wrfbdy_d02, d03, etc. ?
3. Do we have to run WPS and WRF in single domain mode for each domain (parent and child domains)?


Any help will be appreciated,
Thanks

JakeLiu
Posts: 14
Joined: Fri Jun 08, 2018 8:29 am

Re: WRFDA for nested domains

Post by JakeLiu » Sun Mar 31, 2019 9:26 pm

You are right that WRFDA does not support nested run and you have to run WRFDA separately for different domains.
So for 4DVAR, you need to create a wrfbdy file for each domain you want to analyze.

zamba666
Posts: 1
Joined: Tue Feb 11, 2020 3:30 pm
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Re: WRFDA for nested domains

Post by zamba666 » Tue Feb 11, 2020 3:33 pm

had similar issue and yes wrfbdy file helped

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