Question About GSI vs. WRFDA for Data Assimilation

[Naser]

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

 

[Ming Chen]

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.

 

[Naser]

Dear Chen,

Thank you for your reply.
I am sorry to hear that.
I will try to find myself.

Naser