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GEOS-Chem Wiki |
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GEOS-Chem Community Mission: to advance understanding of human and natural influences on the environment 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 14.6.3 | Future releases |
| The 12th International GEOS-Chem Meeting (IGC12) will be held at Washington University in St. Louis (Missouri, USA) on June 8-12, 2026. | ||
Recent GEOS-Chem news
| Date | News |
|---|---|
| 04 Feb 2026 | GCPy 1.7.1 is now released! |
| 08 Jan 2026 | We have created the GEOS-Chem by the Numbers web page, which displays important statistics about GEOS-Chem and its growth over the past several years! |
| 28 Jul 2025 | GEOS-Chem 14.6.3 is now available! |
| 28 Jul 2025 | The status of the GEOS-IT meteorology product in GEOS-Chem has changed from "beta" to "ready to use". You may now use GEOS-IT meteorology to drive your simulations. |
| 03 Jun 2025 | Read the GEOS-Chem Newsletter 2025, Issue #2 |
| 22 May 2025 | New tutorial videos are available on the GEOS-Chem Youtube Channel and BiliBili Space! |
| Ongoing | NASA/GMAO is now producing GEOS chemical forecasts (GEOS-CF) using GEOS-Chem coupled to the NASA/GEOS ESM |
Documentation
General information about GEOS-Chem
You will find more information about GEOS-Chem at the links below:
| Item | Link | Description | Where? |
|---|---|---|---|
| GEOS-Chem website | geos-chem.org | Website that links to GEOS-Chem information and resources | GC web site |
| Welcome Letter | geos-chem.org/welcome.html | A welcome letter for new users of GEOS-Chem | GC Web Site |
| GEOS-Chem Overview | GEOS-Chem overview | A page with linking to many GEOS-Chem topics. | GC Wiki |
| GEOS-Chem by the Numbers | geos-chem.org/stats.html | Statistics documenting current GEOS-Chem usage and its growth over the years | GC Web Site |
| 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) | GC Web Site |
| GEOS-Chem New Developments | geos-chem.org/new-developments.html | A list of significant GEOS-Chem updates and the developers who worked on them | GC Web Site |
| GEOS-Chem Steering Committee (GCSC) | geos-chem.org/steering-committee.html | A listing of current GCSC members and minutes from GCSC meetings | GC Web Site |
| GEOS-Chem Working Groups | geos-chem.org/working-groups.html | A listing of GEOS-Chem Working Groups and Working Group Co-Chairs | GC Web Site |
| GEOS-Chem Versions | GEOS-Chem versions | A listing of GEOS-Chem versions (with links for more information) | GC Wiki |
| GEOS-Chem Species List | View GEOS-Chem Species properties | A listing of the species used in the GEOS-Chem chemistry mechanisms | ReadTheDocs |
| GEOS-Chem Guides | GEOS-Chem Guides | List of several user guides explaining topics in-depth | GC Wiki |
| Requesting Support | GEOS-Chem support guidelines | Instructions for creating GEOS-Chem support requests using the Github issue trackers | ReadTheDocs |
| Submitting code or data | GEOS-Chem contributing guidelines | Instructions for submitting new source code or data updates to be included into GEOS-Chem. | ReadTheDocs |
GEOS-Chem publications
A GEOS-Chem Google Scholar page is now available! Click 'Follow' to be notified of new publications. Contact Huilin Zhan with issues or questions.
GEOS-Chem newsletters
For access to all past GEOS-Chem newsletters, visit this page.
GEOS-Chem user manuals
- User manuals for GEOS-Chem and related software
- User manuals for legacy GEOS-Chem versions (13.0.0 and prior)
- Guide to running GEOS-Chem in CESM
- List of software tools maintained by GEOS-Chem users
GEOS-Chem Wiki archives
We have archived many of the oldest wiki pages to PDF format. Please see our GEOS-Chem Wiki archives to view these pages.