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Can I use both grid nudging and observational nudging at the same time for the same domain?

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kwerner

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Yes, you can; however, using FDDA over a fine grid domain may result in smooth fields, and without solid physical basis (in PBL). It is typically better to use analysis nudging over coarser domains (e.g., dx > 30km) and obs nudging for finer domains.
 
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