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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 and by the Atmospheric Composition Analysis Group at Washington University.

GEOS-Chem overview
Past releases Current release: GEOS-Chem 13.3.4 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 Link Description
GEOS-Chem Classic Getting Started with GEOS-Chem (wiki page)
  • NOTE: Will be ported to soon
GEOS-Chem single-node implementation
(using 1-64 computational cores)
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

GEOS-Chem coupled to the WRF weather model
HEMCO The Harmonized Emissions Component
GCPy The GEOS-Chem Python Toolkit
KPP-for-GEOS-Chem The Kinetic PreProcessor (KPP), customized for GEOS-Chem
GEOS-Chem Adjoint GEOS-Chem Adjoint (wiki page) The GEOS-Chem adjoint model
(NOTE: maintained separately from GEOS-Chem)
GEOS-Chem Videos Tutorial videos for GEOS-Chem, GCHP, HEMCO, GCPy, etc., and recordings of GEOS-Chem meeting sessions
GEOS-Chem Guides GEOS-Chem Guides (wiki page) Short manuals giving a deeper dive into various GEOS-Chem topics (such as compilers, netCDF, diagnostics, etc.)

General information about GEOS-Chem

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

Item Link Description
GEOS-Chem website Website that links to GEOS-Chem information and resources
Welcome Letter GEOS-Chem welcome letter for new users (wiki page) A welcome letter for new users of GEOS-Chem
GEOS-Chem Overview GEOS-Chem overview (wiki page) A page with linking to many GEOS-Chem topics.
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 GEOS-Chem versions (wiki page) A listing of GEOS-Chem versions (with links for more information)
GEOS-Chem Species List Guide to species in GEOS-Chem (wiki page) A listing of the species used in the GEOS-Chem chemistry mechanisms
Requesting Support Submitting GEOS-Chem support requests (wiki page) Instructions for creating GEOS-Chem support requests using the Github issue trackers
Submitting code or data Submitting updates for inclusion in GEOS-Chem (wiki page) Instructions for submitting new source code or data updates to be included into GEOS-Chem.