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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 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.

Please check back here often, as new information is continually being added to the wiki!

General Information about GEOS-Chem

The links below provide more information about general GEOS-Chem topics.

Introduction and Overview

• GEOS-Chem Overview
• GEOS-Chem Vision
• GEOS-Chem Management Charter
• GEOS-Chem People & Projects
• GEOS-Chem welcome letter for new users
• GEOS-Chem programming staff

Getting Started with GEOS-Chem

• Minimum system requirements for GEOS-Chem
• GEOS-Chem supported platforms and compilers
• Downloading GEOS-Chem source code and data
• GEOS-Chem code development cycle
• GEOS-Chem programming resources (e.g. tutorials, user guides, etc.)
• GEOS-Chem Programming Style Guide
• Running GEOS-Chem with TESTRUN

General Technical Information

• Tips on how to debug GEOS-Chem effectively
• Reporting GEOS-Chem bugs
• Parallelizing GEOS-Chem with the OpenMP directives
• Common GEOS-Chem error messages

Code Developers' Forums

These pages contain more specific information about coding issues, emissions, chemistry, met fields, version history, and other aspects of GEOS-Chem. GEOS-Chem users and developers should feel free to contribute to these pages and to initiate discussion on the various topics listed here.

Coding

• GEOS-Chem versions under development
• Machine issues & portability
• Floating point math issues
• Outstanding issues yet to be resolved
• Bugs and fixes

Diagnostics

• Overview of diagnostics characteristics
• Mass Flux (ND24/25/26)

Emissions

• Overview
• Aircraft emissions
• Anthropogenic emissions
  • Table of available anthropogenic emissions inventories for use w/ GEOS-Chem
• Biofuel emissions
• Biogenic emissions
• Biomass burning emissions
• Lightning NOx emissions

Chemistry

• NOx-Ox-hydrocarbon-aerosol (aka "full-chemistry") simulation
• Mercury simulation

Aerosols

• Aerosol thermodynamical equilibrium

Met Fields

• GCAP
• GMAO GEOS-5
  • List of GEOS-5 met fields
  • GEOS-5 issues
• GEOS-Chem Met Fields (from website)

Related Projects

• GEOS-Chem Adjoint
• GEOS-Chem nested grid simulations
• Near-Real-Time Simulations
• Code development with the Earth System Model Framework

Data Visualization and Analysis

IDL

• ITT Visualization (vendor)
• 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

• GAMAP web page
• GAMAP on-line users' guide
• GAMAP tips and tricks
• Date and time computations with GAMAP
• Text manipulation with GAMAP
• Working with timeseries output in GAMAP
• Working with color in IDL by Chris Holmes

Wiki Documentation

• MediaWiki FAQ
• MediaWiki User's Guide
• Examples of Wiki markup text
• One-page editing reference card
• Configuration Settings list
• MediaWiki release mailing list