You can use several different assimilated meteorological data products to drive GEOS-Chem simulations. For more information, please consult the following GEOS-Chem wiki resources:
|Met data product||Wiki Documentation|
(aka GEOS-5 "forward processing")
These have been de-supported in GEOS-Chem 12.0.0 (aka v11-02-final), per request of NASA/GMAO.