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GEOS–Chem Wiki

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!

Current public release:

GEOS-Chem v10-01

v10-01 benchmark history

Version in development:

GEOS-Chem v11-01

v11-01 benchmark history

Version for high-performance computing (HPC) environments:



Supported meteorological fields:

Refer to this table


List of publications:

Refer to this page


Info for getting started:

GEOS-Chem welcome letter for new users
GEOS-Chem basics



General information about GEOS–Chem

Introduction and overview Steering Committee And Working Groups
Getting Started With GEOS-Chem General Technical Information


GEOS–Chem Code Developers' Forums

Coding Diagnostics
Emissions Chemistry
Dynamics Deposition
Aerosols Met Fields
Nested Grid Simulations Earth System Model Framework
Benchmarking and Evaluation Related Projects


Reference Section

Fortran Perl
R Python
NCAR Command Language (NCL) Wiki Documentation