Looking for revised mozbc code for WRF hybrid coordinate / WRF-Chem v4.5.1

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Yike Wang

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Jul 4, 2026, 12:59:50 AMJul 4

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Dear all,

I am preparing chemical initial and boundary conditions for WRF-Chem v4.5.1 simulations of CO₂ and CH₄ using mozbc.

My wrfinput_d01 file shows:

:HYBRID_OPT = 2 ;

so my WRF simulation uses the hybrid sigma-pressure vertical coordinate.

On the WRF-Chem tools community page, I found the following note:

Update November 2021: Thanks to a WRF-Chem user, revised mozbc code for use with the new WRF hybrid coordinate is available in the User Forum.

However, I have not been able to locate the revised mozbc files in the User Forum.

Could anyone please point me to the correct revised mozbc code for the WRF hybrid coordinate? Also, for WRF-Chem v4.5.1, should I use the official mozbc package from the ACOM download page, or the modified GitHub version below?

Official ACOM mozbc:
https://www.acom.ucar.edu/wrf-chem/download.shtml

Modified mozbc for WRF v3.9+:
https://github.com/fengx7/mozbc_for_WRFv3.9

Any advice or experience with mozbc for WRF-Chem v4.5.1 / HYBRID_OPT = 2 would be greatly appreciated.