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<big>'''GEOS-Chem Wiki'''</big>
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|<p><font color="#FFFFFF" size="+3">'''GEOS&#150;Chem Wiki'''</font></p>


The [http://www.as.harvard.edu/ctm/geos/ 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 [http://www.as.harvard.edu NASA Global Modeling and Assimilation Office]. It is applied by [http://www.as.harvard.edu/ctm/geos/geos_people.html research groups around the world] to a wide range of atmospheric composition problems, Central management and support of the model is provided by the [http://www.as.harvard.edu/ctm/index.html Atmospheric Chemistry Modeling Group at Harvard University.]
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This wiki is meant to facilitate communication between GEOS-Chem users and developers. If this is '''your first time here''', check out [[Features of the GEOS-Chem public wiki|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.
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New information is continually being added to the wiki, so please check back here often, or even better, [[Features_of_the_GEOS-Chem_public_wiki#Let_the_GEOS-Chem_wiki_inform_you_of_recent_changes.21|subscribe to the recent changes' RSS feed]]: you will not miss a discussion!
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== General Information about GEOS-Chem ==
----


The links below provide more information about general GEOS-Chem topics.  
<p align="center"><big>'''GEOS-Chem Community Mission: to advance understanding of human and natural influences on the environment<br>through a comprehensive, state-of-the-science, readily accessible global model of atmospheric composition.'''</big></p>


=== Introduction and Overview ===
The [http://geos-chem.org 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 [http://gmao.gsfc.nasa.gov/ NASA Global Modeling and Assimilation Office]. It is applied by [https://geoschem.github.io/geos-chem-people-projects-map/ research groups around the world] to a wide range of atmospheric composition problems. Central management and support of the model is provided by the [https://acmg.seas.harvard.edu/ Atmospheric Chemistry Modeling Group at Harvard University] and by the [https://sites.wustl.edu/acag/ Atmospheric Composition Analysis Group at Washington University].
* [[Features of the GEOS-Chem public wiki]]
* [http://www.as.harvard.edu/ctm/geos/geos_overview.html GEOS-Chem Overview]
* [http://www.as.harvard.edu/ctm/geos/geos_vision.html GEOS-Chem Vision]
* [http://www.as.harvard.edu/ctm/geos/geos_charter.html GEOS-Chem Management Charter]
* [http://www.as.harvard.edu/ctm/geos/geos_people GEOS-Chem People & Projects]
* [[GEOS-Chem Working Groups and Steering Committee]]
* [[GEOS-Chem welcome letter for new users]]
* [[GEOS-Chem programming staff]]
* [[GEOS-Chem newsletters]]


=== Getting Started with GEOS-Chem ===
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* [[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.)
* [http://www.as.harvard.edu/ctm/geos/doc/man/appendix_7.html GEOS-Chem Programming Style Guide]
* [[Running GEOS-Chem with TESTRUN]]


=== General Technical Information ===
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* [[Initial conditions for GEOS-Chem]]
* [[GEOS-Chem Debugging Tips|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 ==
|-valign="top"
|colspan="3" align="center" bgcolor="#CCCCCC"|'''<font size="+2">[[GEOS-Chem overview]]</font>'''
|-valign="top"
|width="225px" align="center"|<font size="+2">[[GEOS-Chem versions|Past releases]]</font>
|width="450px" align="center" bgcolor="#CCFFFF"|<font size="+2">[[GEOS-Chem 14.4.0|'''Current release: GEOS-Chem 14.4.0''']]</font>
|width="225px" align="center"|<font size="+2">[[GEOS-Chem model development_priorities|Future releases]]</font>


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 ===
== News ==
* [[GEOS-Chem versions under development]]
*31 May 2024: [[GEOS-Chem 14.4.0]] is now available!
* [[Machine issues & portability]]
*02 Feb 2024: Read the [https://drive.google.com/file/d/1v0cHAf6S8EMpUZNb7eVqvcRwbIAIxpRI/view?usp=sharing GEOS-Chem Newsletter 2024, Issue #1]
* [[Floating point math issues]]
*A [https://scholar.google.com/citations?user=ho-sNj4AAAAJ GEOS-Chem Google Scholar page] is now available!
* [[Bugs and fixes]]
**Click 'Follow' to be notified of new publications.
* [[Previous issues that are now resolved...]]
**Contact [mailto:rebekah.horner.20@ucl.ac.uk Bex Horner] with issues or questions.
** [[Previous issues now resolved in v8-01-01|in GEOS-Chem v8-01-01]]
*The GEOS-Chem Youtube Channel has 350+ subscribers and a new URL: <tt>'''https://www.youtube.com/~geoschem'''</tt>
** [[Previous issues now resolved in v8-01-02|in GEOS-Chem v8-01-02]]
*NASA/GMAO is now producing [https://gmao.gsfc.nasa.gov/weather_prediction/GEOS-CF/ GEOS chemical forecasts (GEOS-CF)] using GEOS-Chem coupled to the NASA/GEOS ESM
** [[Previous issues now resolved in v8-01-03|in GEOS-Chem v8-01-03]]
* [[Outstanding issues yet to be resolved]]


=== Diagnostics ===
For access to all past GEOS-Chem newsletters, visit [[GEOS-Chem newsletters|this page]].
* [http://www-as.harvard.edu/chemistry/trop/geos/doc/man/appendix_5.html Overview of diagnostics characteristics]
* [[Mass Flux (ND24/25/26)]]
* [[Additional diagnostics]]


=== Emissions ===
== Documentation ==
* [[Overview]]
* [[Aircraft emissions]]
* [[Anthropogenic emissions]]
** [http://www.as.harvard.edu/ctm/geos/word_pdf_docs/INVENTORY_GC_public.pdf Table of available anthropogenic emissions inventories for use w/ GEOS-Chem]
* [[Biofuel emissions]]
* [[Biogenic emissions]]
* [[Biomass burning emissions]]
* [[Lightning NOx emissions]]


=== Chemistry ===
=== GEOS-Chem manuals and tutorials ===
* [[Chemistry Issues]]
* [[NOx-Ox-HC-aerosol|NOx-Ox-hydrocarbon-aerosol (aka "full-chemistry") simulation]]
* [[Photolysis mechanism]]
* [[Mercury|Mercury simulation]]
* [[Tagged CO simulation]]


=== Aerosols ===
Read [https://geos-chem.readthedocs.io/en/latest/geos-chem-shared-docs/supplemental-guides/related-docs.html '''user manuals'''] for GEOS-Chem 14 and related software.
* [[Aerosols overview: projects and developments]]
* [[Aerosol thermodynamical equilibrium]]
* [[Secondary organic aerosols]]
* [[Sea salt aerosols]]
* [[Sulfate aerosols]]


=== Met Fields ===
Also see our list of [[Software_maintained_by_GEOS-Chem_community_members|'''software tools maintained by GEOS-Chem users''']].
* [[GCAP]]
* GMAO GEOS-5
** [[List of GEOS-5 met fields]]
** [[GEOS-5 issues]]
** [[GEOS-5 met field reprocessing]]
* [http://www.as.harvard.edu/ctm/geos/doc/man/appendix_4.html GEOS-Chem Met Fields (from website)]


=== Earth System Model Framework ===
The user manual for GEOS-Chem 13.4.1 and prior versions may be found '''[[Getting Started with GEOS-Chem|HERE]]'''.
* [[Installing ESMF and other required libraries]]
* [[Code development with the Earth System Model Framework]]
* [[Automatic documentation with protex|Generating automatic LaTeX documentation with protex]]
** [http://frodo.elon.edu/tutorial/tutorial/tutorial.html Web-based LaTeX tutorial]


=== Related Projects ===
=== General information about GEOS-Chem ===
* [[GEOS-Chem Adjoint]]
* [[GEOS-Chem nested grid simulations]]
* [[GEOS-Chem Near-Real-Time Simulations]]


== Data Visualization and Analysis ==
The table below lists where you can find general information about GEOS-Chem.


=== IDL ===
{| border=1 cellpadding=5 cellspacing=0
* [http://www.ittvis.com/ ITT Visualization (vendor)]
* [http://idlastro.gsfc.nasa.gov/idl_html_help/Structures.html Structures in IDL]
* [http://idlastro.gsfc.nasa.gov/idl_html_help/Pointers.html Pointers in IDL]
* [http://idlastro.gsfc.nasa.gov/idl_html_help/Overview_of_Mathematics_in_IDL.html Overview of Mathematics in IDL]
* [http://www.dfanning.com/ Coyote's Guide to IDL Programming (David Fanning's Web Site)] - Lots of tips on how to accomplish programming tasks
* [http://www.mpimet.mpg.de/en/misc/software/idl IDL Page at Max Planck Institute for Meteorology]
* [http://www.mpimet.mpg.de/en/misc/software/idl/doc/mgs_script.pdf Martin Schultz's IDL Tutorial (PDF Format)]
* [http://idlastro.gsfc.nasa.gov/homepage.html IDL Astronomy User's Library]
* [http://fermi.jhuapl.edu/s1r/idl/idl.html JHU/APL/S1R IDL routines page]
* [http://cow.physics.wisc.edu/~craigm/idl/idl.html Craig Markwardt's IDL library]
* [http://cimss.ssec.wisc.edu/~gumley/doc/idltips.pdf The Underground Guide to IDL by Liam Gumley (PDF)]
* [[Reading binary files in IDL]]


=== GAMAP ===
|-valign="top"
* [http://www.as.harvard.edu/ctm/gamap/ GAMAP web page]
!width="200px" bgcolor="#CCCCCC"|Item
* [http://www.as.harvard.edu/ctm/gamap/doc/ GAMAP on-line users' guide]
!width="360px" bgcolor="#CCCCCC"|Link
* [[GAMAP bugs and fixes]]
!width="365px" bgcolor="#CCCCCC"|Description
* [[GAMAP tips and tricks]]
**[[General GAMAP usage]]
**[[File I/O with GAMAP]]
***[http://www-as.harvard.edu/chemistry/trop/gamap/doc/timeseries_brief_tutorial.pdf Working with timeseries output in GAMAP]
**[[Color and graphics with GAMAP]]
*** [http://www.as.harvard.edu/ctm/geos/wiki_docs/gamap/gamap_color_table_file.pdf Loading Color Tables in GAMAP v2.12]
*** [http://www.as.harvard.edu/chemistry/trop/forum_files/cdh_ColorInIDL.pdf Working with color in IDL by Chris Holmes]
**[[Regridding with GAMAP]]
**[[Date and time computations with GAMAP]]
**[[Text manipulation with GAMAP]]


== Wiki Documentation ==
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* [[Sandbox]]
|'''GEOS-Chem website'''
* [http://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
|[http://www.geos-chem.org geos-chem.org]
* [http://meta.wikimedia.org/wiki/Help:Contents MediaWiki User's Guide]
|Website that links to GEOS-Chem information and resources
* [http://meta.wikimedia.org/wiki/Help:Wikitext Examples of Wiki markup text]
 
* [http://meta.wikimedia.org/wiki/Help:Reference_card One-page editing reference card]
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* [http://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration Settings list]
|'''Welcome Letter'''
* [http://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
|[http://geos-chem.org/welcome.html geos-chem.org/welcome.html]
|A welcome letter for new users of GEOS-Chem
 
|-valign="top"
|'''GEOS-Chem Overview'''
|[[GEOS-Chem overview]] (wiki page)
|A page with linking to many GEOS-Chem topics.
 
|-valign="top"
|'''GEOS-Chem Narrative'''
|[http://geos-chem.org/narrative.html geos-chem.org/narrative.html]
|A narrative descrption of GEOS-Chem that you can include in scientific papers (plus instructions for citing GEOS-Chem)
 
|-valign="top"
|'''GEOS-Chem New Developments'''
|[http://geos-chem.org/new-developments.html geos-chem.org/new-developments.html]
|A list of significant GEOS-Chem updates and the developers who worked on them
 
|-valign="top"
|'''GEOS-Chem Steering Committee (GCSC)'''
|[http://geos-chem.org/steering-committee.html geos-chem.org/steering-committee.html]
|A listing of current GCSC members and minutes from GCSC meetings
 
|-valign="top"
|'''GEOS-Chem Working Groups'''
|[http://geos-chem.org/working-groups geos-chem.org/working-groups.html]
|A listing of GEOS-Chem Working Groups and Working Group Co-Chairs
 
|-valign="top"
|'''GEOS-Chem Versions'''
|[[GEOS-Chem versions]] (wiki page)
|A listing of GEOS-Chem versions (with links for more information)
 
|-valign="top"
|'''GEOS-Chem Species List'''
|[https://geos-chem.readthedocs.io/en/latest/geos-chem-shared-docs/supplemental-guides/species-guide.html View GEOS-Chem Species properties] (ReadTheDocs page)
|A listing of the species used in the GEOS-Chem chemistry mechanisms
 
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|'''GEOS-Chem Guides'''
|[[GEOS-Chem_overview#GEOS-Chem_Guides|GEOS-Chem Guides (wiki page)]]
|List of several user guides explaining topics in-depth
 
|-valign="top"
|'''Requesting Support'''
|[https://geos-chem.readthedocs.io/en/latest/help-and-reference/SUPPORT.html GEOS-Chem support guidelines]
|ReadTheDocs page with instructions for creating GEOS-Chem support requests using the Github issue trackers
 
|-valign="top"
|'''Submitting code or data'''
|[https://geos-chem.readthedocs.io/en/latest/help-and-reference/CONTRIBUTING.html GEOS-Chem contributing guidelines]
|ReadTheDocs page with instructions for submitting new source code or data updates to be included into GEOS-Chem.
 
|}

Revision as of 17:45, 31 May 2024

GEOS&#150;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 and by the Atmospheric Composition Analysis Group at Washington University.

GEOS-Chem overview
Past releases Current release: GEOS-Chem 14.4.0 Future releases

News

For access to all past GEOS-Chem newsletters, visit this page.

Documentation

GEOS-Chem manuals and tutorials

Read user manuals for GEOS-Chem 14 and related software.

Also see our list of software tools maintained by GEOS-Chem users.

The user manual for GEOS-Chem 13.4.1 and prior versions may be found HERE.

General information about GEOS-Chem

The table below lists where you can find general information about GEOS-Chem.

Item Link Description
GEOS-Chem website geos-chem.org Website that links to GEOS-Chem information and resources
Welcome Letter geos-chem.org/welcome.html A welcome letter for new users of GEOS-Chem
GEOS-Chem Overview GEOS-Chem overview (wiki page) A page with linking to many GEOS-Chem topics.
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)
GEOS-Chem New Developments geos-chem.org/new-developments.html A list of significant GEOS-Chem updates and the developers who worked on them
GEOS-Chem Steering Committee (GCSC) geos-chem.org/steering-committee.html A listing of current GCSC members and minutes from GCSC meetings
GEOS-Chem Working Groups geos-chem.org/working-groups.html A listing of GEOS-Chem Working Groups and Working Group Co-Chairs
GEOS-Chem Versions GEOS-Chem versions (wiki page) A listing of GEOS-Chem versions (with links for more information)
GEOS-Chem Species List View GEOS-Chem Species properties (ReadTheDocs page) A listing of the species used in the GEOS-Chem chemistry mechanisms
GEOS-Chem Guides GEOS-Chem Guides (wiki page) List of several user guides explaining topics in-depth
Requesting Support GEOS-Chem support guidelines ReadTheDocs page with instructions for creating GEOS-Chem support requests using the Github issue trackers
Submitting code or data GEOS-Chem contributing guidelines ReadTheDocs page with instructions for submitting new source code or data updates to be included into GEOS-Chem.
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