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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 14.4.1	Future releases

News

• 03 Jul 2024: We have started migrating older content to GEOS-Chem Wiki archive.
• 28 Jun 2024: GEOS-Chem 14.4.1 is now available!
• 02 Feb 2024: Read the GEOS-Chem Newsletter 2024, Issue #1
• A GEOS-Chem Google Scholar page is now available!
  • Click 'Follow' to be notified of new publications.
  • Contact Bex Horner with issues or questions.
• The GEOS-Chem Youtube Channel has 350+ subscribers and a new URL: https://www.youtube.com/~geoschem
• NASA/GMAO is now producing GEOS chemical forecasts (GEOS-CF) using GEOS-Chem coupled to the NASA/GEOS ESM

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

Documentation

Archives

In order to prepare for a migration of the wiki platform, we have archived many of the oldest wiki pages to PDF format. Please see our GEOS-Chem Wiki archives to view these pages.

GEOS-Chem manuals and tutorials

Read user manuals for GEOS-Chem 14 and related software. Also see our GEOS-Chem in CESM wiki page for more information about running GEOS-Chem in the NCAR CESM Earth System Model.

Also see our list of software tools maintained by GEOS-Chem users.

The user manual for GEOS-Chem 13.4.1 and prior versions may be found HERE.

General information about GEOS-Chem

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

Item	Link	Description
GEOS-Chem website	geos-chem.org	Website that links to GEOS-Chem information and resources
Welcome Letter	geos-chem.org/welcome.html	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	geos-chem.org/narrative.html	A narrative descrption of GEOS-Chem that you can include in scientific papers (plus instructions for citing GEOS-Chem)
GEOS-Chem New Developments	geos-chem.org/new-developments.html	A list of significant GEOS-Chem updates and the developers who worked on them
GEOS-Chem Steering Committee (GCSC)	geos-chem.org/steering-committee.html	A listing of current GCSC members and minutes from GCSC meetings
GEOS-Chem Working Groups	geos-chem.org/working-groups.html	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	View GEOS-Chem Species properties (ReadTheDocs page)	A listing of the species used in the GEOS-Chem chemistry mechanisms
GEOS-Chem Guides	GEOS-Chem Guides (wiki page)	List of several user guides explaining topics in-depth
Requesting Support	GEOS-Chem support guidelines	ReadTheDocs page with instructions for creating GEOS-Chem support requests using the Github issue trackers
Submitting code or data	GEOS-Chem contributing guidelines	ReadTheDocs page with instructions for submitting new source code or data updates to be included into GEOS-Chem.