Question About GSI vs. WRFDA for Data Assimilation

Naser

Naser

Member
Hi everyone,

I’ve been working on some experiments using GSI for data assimilation and wanted to get your thoughts on a few things.

Here’s what I’ve done so far:
  • Ran WRF-Chem for my study period at 00 and 12 UTC.
  • Used wrapper_gen_be_gsi.ksh to generate the background error covariance.
  • Ran GSI using run_gsi_chem.ksh.
  • Used the resulting wrf_inout file to update my WRF initial conditions.
Now I’m shifting focus to WRFDA-3DVAR, and I have a few questions:
  1. What are the main differences between GSI and WRFDA?
  2. Is it correct to say that GSI is not a pure 3DVAR or 4DVAR system?
  3. Based on your experience, which system would you recommend using for atmospheric chemical data assimilation?
  4. Has anyone done a direct comparison between the results from GSI and WRFDA?

I’d really appreciate any insights or suggestions. Thanks in advance!


Best,
Naser
 
Naser,

I am sorry that we no longer provide support for WRFDA due to limited human power. However, please take a look at the documents here, which provides helpful information for WRFDA.
 
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