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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.

This wiki is meant to facilitate communication between GEOS-Chem users and developers. If this is your first time here, check out the features page. If you would like to contribute to the wiki, please register as a user by clicking create account at the top right corner of this page.

New information is continually being added to the wiki, so please check back here often, or even better, subscribe to the recent changes' RSS feed: you will not miss a discussion!



GEOS-Chem v11-02-final will also carry the designation GEOS-Chem 12.0.0. We are migrating to a purely numeric versioning system in order to adhere more closely to software development best practices. For a complete description of the new versioning system, please see our GEOS-Chem version numbering system wiki page.




Getting started w/ GEOS-Chem: Welcome letter for new users GEOS-Chem basics
Current release candidate: v11-02-release-candidate v11-02 benchmark history
Pending major release: GEOS-Chem 12.0.0
aka v11-02-final in the
old version number system
GEOS-Chem 12 benchmark history
Version for HPC environments: GEOS-Chem HP GEOS-Chem HP Status
List of publications: Refer to this page
GEOS-Chem public license: License agreement document List of developers


General information about GEOS-Chem

Introduction to GEOS-Chem and the International GEOS-Chem User Community
Getting started with GEOS-Chem


GEOS-Chem Code Developers' Forums

Coding Meteorological Fields
Current met field products

Obsolete met field products

Emissions Chemistry
Dynamics Deposition
Aerosols Benchmarking and Evaluation
Nested grid simulations Diagnostics
Related projects Other resources


Reference Section

IDL GAMAP
Fortran Perl
R Python
NCAR Command Language (NCL) Wiki documentation