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Surface Data Assimilation in WRF/NMMB

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New member
Good morning!

Trying to understand how can I only run Surface Data Assimilation with GSI. Models I am working with like IFS and HARMONIE-AROME have separate modules for Surface DA and Upper Air DA, so you can execute only Surface DA if you want. This is what I would like to with WRF and NMMB, so with the GSI system I guess. I have been taking a look to the GSI user guide but it is not clear to me how to do this.

Does anyone have any information on this?

Many thanks to everybody.

Spanish Met Agency