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WRF FDDA Best Practices?

Posted: Tue May 11, 2021 8:27 pm
by rconrick
Hi all,

I'm wondering if anyone can offer or point me to some best practices for using WRF's FDDA nudging options.
Our operational WRF runs use a 36-12-4-1.33 km configuration with nudging on the outer 36km domain.

For my research runs, I'm using a 12 km domain (nudged) with a 4 km domain nested within (not nudged). These are generally short (case study) simulations of 24-48 hours, but I'd like to match observations/analysis as closely as possible.

Is there any advice out there about whether this 12-4 km setup is okay? Or should I ditch the nudging entirely?

Thanks!

Re: WRF FDDA Best Practices?

Posted: Wed May 12, 2021 11:16 pm
by Ming Chen
Please take a look at the website: https://www2.mmm.ucar.edu/wrf/users/doc ... chap7.html
where you can find detailed introduction how to do FDDA, whether ad when FDDA should be conducted for nested domain. etc.
In generally, if you have dense, high-quality observations over your model domain, then FDDA is a good option that may help to improve your simulation. The 12km-4km setting is commonly used in many case studies, and I believe it is appropriate.