Source code repositories¶
The GEOS-Chem Classic source code is distributed into 3 Github repositories, as described below. This setup allows the GEOS-Chem core science routines to be easily integrated into several modeling contexts, such as:
GEOS-Chem within the NASA/GEOS ESM
GEOS-Chem within CESM (aka CESM-GC)
GEOS-Chem withn WRF (aka WRF-GC)
This repository setup also aligns with our GEOS-Chem Vision and Mission statements.
GEOS-Chem Science Codebase¶
The GEOS-Chem “Science” Codebase repository (https://github.com/geoschem/geos-chem) contains the GEOS-Chem science routines, plus:
Scripts to create GEOS-Chem run directories
Scripts to create GEOS-Chem integration tests
Interfaces (i.e. the driver programs) for GEOS-Chem Classic, GCHP, etc.
The HEMCO repository (https://github.com/geoschem/HEMCO) contains the source code for the Harmonized Emissions Component, which is used to read and regrid emissions, met fields, and other inputs to GEOS-Chem.
The GCClassic repository (https://github.com/geoschem/GCClassic) is a lightweight wrapper that encompasses GEOS-Chem and HEMCO. We say that GCClassic is the superproject (i.e. top-level source code folder), and that GEOS-Chem (science codebase) and HEMCO are submodules.