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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 13.3.2	Future releases

News

• 19 Sep 2021: Read the GEOS-Chem Newsletter, Winter 2021
• 18 Nov 2021: GEOS-Chem 13.3.2 is now available!
• 11 Dec 2020: A GEOS-Chem Google Scholar page is now available

Click 'Follow' to be notified of new publications. Contact Gongda Lu with issues or questions.

• 02 Apr 2020: The GEOS-Chem Youtube Channel has 100+ subscribers and a new URL: https://youtube.com/c/geoschem
• 03 Feb 2020: View our GEOS-Chem "dry-run" tutorial at our GEOS-Chem Youtube channel
• 17 Sep 2019: 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

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 geos-chem.readthedocs.io soon	GEOS-Chem single-node implementation (using 1-64 computational cores)
GCHP	gchp.readthedocs.io	GEOS-Chem multi-node "high performance" implementation (using 100's - 1000's of computational cores)
GEOS-Chem on the cloud	cloud.geos-chem.org	Instructions for running GEOS-Chem on the Amazon Web Services EC2 cloud-computing platform
WRF-GC	wrf.geos-chem.org	GEOS-Chem coupled to the WRF GCM
HEMCO	hemco.readthedocs.io	The Harmonized Emissions Component
GCPy	gcpy.readthedocs.io	The GEOS-Chem Python Toolkit
KPP-for-GEOS-Chem	kpp.readthedocs.io	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	youtube.com/c/geos-chem	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	geos-chem.org	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	geos-chem.org/geos_chem_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/geos_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/geos_steering_cmte.html	A listing of current GCSC members and minutes from GCSC meetings
GEOS-Chem Working Groups	geos-chem.org/geos_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	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.