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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
Supported meteorological fields:	Refer to this table
List of publications:	Refer to this page

 

General information about GEOS–Chem
Introduction and overview	Steering Committee And Working Groups
GEOS-Chem welcome letter for new users Features of the GEOS-Chem public wiki Customizing your GEOS-Chem Wiki Settings GEOS-Chem Overview GEOS-Chem People & Projects User Resources, Code Development Guidelines, and Debugging Tips GEOS-Chem Support Team GEOS-Chem newsletters GEOS-Chem Search Engines Recommendations for offering co-authorships to GEOS-Chem developers GEOS-Chem code development history	GEOS-Chem Steering Committee GEOS-Chem model development priorities GEOS-Chem Working Groups Adjoint Model and Data Assimilation Working Group Aerosols Working Group Carbon Cycle Working Group Chemistry-Climate Working Group GEOS-Chem High Performance Working Group Hg and POPs Working Group Organics Working Group Oxidants and Chemistry Working Group Nested Model Working Group Sources and Surface Uptake Working Group Transport Working Group
Getting Started With GEOS-Chem	General Technical Information
Frequently asked questions about GEOS-Chem Minimum system requirements for GEOS-Chem GEOS-Chem supported platforms and compilers Downloading GEOS-Chem source code and data Creating GEOS-Chem run directories GEOS-Chem programming resources (e.g. tutorials, user guides, etc.) GEOS-Chem Programming Style Guide	Initial conditions for GEOS-Chem Centralized chemistry time step Tips on how to debug GEOS-Chem effectively Reporting GEOS-Chem bugs Debugging with the GEOS-Chem unit tester Parallelizing GEOS-Chem with the OpenMP directives Common GEOS-Chem error messages Adding advected tracers and chemical species to GEOS-Chem Adding passive (CO-like) tracers to GEOS-Chem

 

GEOS–Chem Code Developers' Forums
Coding	Diagnostics
GEOS-Chem versions under development List of GEOS-Chem bugs and in which version they were resolved Currently unresolved issues in GEOS-Chem Common GEOS-Chem error messages GEOS-Chem performance Machine issues & portability Passing array arguments efficiently in GEOS-Chem Floating point math issues Version control with Git	Overview of diagnostics characteristics Diagnostic time step Mass Flux (ND24/25/26) Additional diagnostics
Emissions	Chemistry
HEMCO emissions component HEMCO data directories Aerosol emissions Aircraft emissions Anthropogenic emissions Scale factors for anthropogenic emissions Biofuel emissions Biogenic emissions Biomass burning emissions Lightning NOx emissions Ship emissions Soil NOx emissions Volcanic emissions Historical and future emissions	GEOS-Chem chemistry mechanisms Stratopsheric chemistry options Specialty simulations (aka "offline simulations") Other resources Chemistry Issues Process Analysis Diagnostics Photolysis mechanisms used in GEOS-Chem DSMACC chemical box model List of recent papers about isoprene Linking GEOS-Chem to CMAQ Coupling GEOS-Chem with RRTMG GEOS-Chem species database (NEW in v11-01!) Physical properties of GEOS-Chem species (NEW in v11-01!)
Dynamics	Deposition
Advection scheme TPCORE Boundary layer mixing Cloud convection Dynamic tropopause	Dry deposition Leaf area indices in GEOS-Chem Wet deposition
Aerosols	Met Fields
Aerosols working group Aerosol-only simulation Aerosol optical properties Aerosol thermodynamical equilibrium Carbonaceous aerosols Mineral dust aerosols Secondary organic aerosols Sea salt aerosols Sulfate aerosols Aerosol Microphysics APM TOMAS	GCAP List of GCAP met fields used by GEOS-Chem Overview of GMAO met data products Version history of GMAO met data products GMAO GEOS-4 List of GEOS-4 met fields used by GEOS-Chem GMAO GEOS-5.2.0 List of GEOS-5.2.0 met fields used by GEOS-Chem Issues with GEOS-5.2.0 met data GMAO MERRA "reanalysis" List of MERRA met fields used by GEOS-Chem Implementing MERRA into GEOS-Chem GMAO GEOS-FP List of GEOS-FP met fields used by GEOS-Chem Implementing GEOS-FP into GEOS-Chem GEOS-Chem Met Fields (from website) Notes regarding GEOS vertical grids
Nested Grid Simulations	Earth System Model Framework
GEOS-Chem nested grid simulations Setting up GEOS-Chem nested grid simulations Available met data for nested grid simulations Protocol for nested-grid data downloads	Installing ESMF and other required libraries Code development with the Earth System Model Framework Generating automatic LaTeX documentation with protex Web-based LaTeX tutorial
Benchmarking and Evaluation	Related Projects
General info about GEOS-Chem benchmark simulations List of GEOS-Chem 1-year benchmark simulations Mean OH lifetime in GEOS-Chem FTP site with output from 1-year GEOS-Chem benchmark simulations GEOS-Chem participation in community intercomparisons Satellite Instrument Specifications Table	Grid-independent GEOS-Chem GEOS-Chem Adjoint GEOS-Chem Near-Real-Time Simulations FlexAOD

 

Reference Section
IDL	GAMAP
Exelis Visual Information Solutions (vendor) Online IDL Reference Manual @ Exelis website Structures in IDL Pointers in IDL Overview of Mathematics in IDL Coyote's Guide to IDL Programming (David Fanning's Web Site) - Lots of tips on how to accomplish programming tasks IDL Page at Max Planck Institute for Meteorology Martin Schultz's IDL Tutorial (PDF Format) IDL Astronomy User's Library JHU/APL/S1R IDL routines page Craig Markwardt's IDL library The Underground Guide to IDL by Liam Gumley (PDF) Reading binary files in IDL	GAMAP web page GAMAP on-line users' guide GAMAP bugs and fixes GAMAP tips and tricks General GAMAP usage TVMAP cheat sheet File I/O with GAMAP Working with timeseries output in GAMAP Color and graphics with GAMAP Loading Color Tables in GAMAP v2.12 Working with color in IDL by Chris Holmes Regridding with GAMAP Date and time computations with GAMAP Text manipulation with GAMAP
Fortran	Perl
Intel Fortran Compiler Version 11.1 Version 12.1 Version XE 13.1 Version 15.0 PGI Fortran IBM XL Fortran Sun Studio 11 Fortran Compiler Modular Programming w/ Fortran 90 (U. Liverpool) Other University of Liverpool F90 tutorials and courses User Notes on FORTRAN Programming Fortran 90 for the FORTRAN 77 Programmer Fortran 90 Home Page at King's College, London Object Oriented Fortran 90 Programming	Perl.com Beginning Perl by Simon Cozens (free online book) Perl in 20 pages MediaWiki User's Guide Comprehensive Perl Archive Network (CPAN.org)
R	Python
The R project for statistical computing The R journal R by example Using R to analyze GEOS-Chem data	Python code for GEOS-Chem Python.org: Main site for all things Python Python.org Tutorial PythonWiki.org: List of tutorials and resources Google's Python tutorial
NCAR Command Language (NCL)	Wiki Documentation
NCL main page NCL applications NCL documentation Sign up for NCL-Talk email list NCL4GC: NCL tools for GEOS-Chem	Sandbox MediaWiki FAQ MediaWiki User's Guide Examples of Wiki markup text One-page editing reference card Configuration Settings list MediaWiki release mailing list