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GEOS–Chem Wiki

GEOS-Chem Community Mission: to advance understanding of human and natural influences on the environment
through a comprehensive, state-of-the-science, readily accessible global model of atmospheric composition.

The GEOS–Chem model is a global 3-D model of atmospheric composition driven by assimilated meteorological observations from the Goddard Earth Observing System (GEOS) of the NASA Global Modeling and Assimilation Office. It is applied by research groups around the world to a wide range of atmospheric composition problems, Central management and support of the model is provided by the Atmospheric Chemistry Modeling Group at Harvard University.

GEOS-Chem overview
Past releases Current release: GEOS-Chem 12.9.3 Future releases


For access to all past GEOS-Chem newsletters, visit this page.


GEOS-Chem manuals and tutorials

The table below lists the various manual pages for GEOS-Chem and its related software packages.

Item Description Documentation is located at:
GEOS-Chem Classic GEOS-Chem single-node implementation
(using 1-64 computational cores)
Getting Started with GEOS-Chem (wiki page)
GCHP GEOS-Chem multi-node "high performance" implementation
(using 100's - 1000's of computational cores)
GEOS-Chem on the cloud Instructions for running GEOS-Chem on the Amazon Web Services EC2 cloud-computing platform
WRF-GC GEOS-Chem coupled to the WRF GCM
HEMCO The Harmonized Emissions Component
GCPy The GEOS-Chem Python Toolkit
GEOS-Chem Adjoint The GEOS-Chem adjoint model
(NOTE: maintained separately from GEOS-Chem)
GEOS-Chem Adjoint (wiki page)
GEOS-Chem Videos Tutorial videos for GEOS-Chem, GCHP, HEMCO, GCPy, etc., and recordings of GEOS-Chem meeting sessions
GEOS-Chem Guides Short manuals giving a deeper dive into various GEOS-Chem topics (such as compilers, netCDF, diagnostics, etc.) GEOS-Chem Guides (wiki page)

General information about GEOS-Chem

The table below lists where you can find general information about GEOS-Chem.

Item Description Documentation is located at:
GEOS-Chem website Website that links to GEOS-Chem information and resources
Welcome Letter A welcome letter for new users of GEOS-Chem GEOS-Chem welcome letter for new users (wiki page)
GEOS-Chem Overview A page with linking to many GEOS-Chem topics. GEOS-Chem overview (wiki page)
GEOS-Chem Narrative A narrative descrption of GEOS-Chem that you can include in scientific papers (plus instructions for citing GEOS-Chem)
GEOS-Chem New Developments A list of significant GEOS-Chem updates and the developers who worked on them
GEOS-Chem Steering Committee (GCSC) A listing of current GCSC members and minutes from GCSC meetings
GEOS-Chem Working Groups A listing of GEOS-Chem Working Groups and Working Group Co-Chairs
GEOS-Chem Versions A listing of GEOS-Chem versions (with links for more information) GEOS-Chem versions (wiki page)
GEOS-Chem Species List A listing of the species used in the GEOS-Chem chemistry mechanisms Guide to species in GEOS-Chem (wiki page)
Requesting Suppport Instructions for creating GEOS-Chem support requests using the Github issue trackers Submitting GEOS-Chem support requests (wiki page)
Submitting code or data Instructions for submitting new source code or data updates to be included into GEOS-Chem. Submitting updates for inclusion in GEOS-Chem (wiki page)