GEOS-Chem versions

Here we have posted links to a separate wiki page describing each GEOS-Chem model version.

GEOS-Chem development history

In the sections below, we list information about current and past GEOS-Chem releases.

NOTES:

1. Information about 1-year benchmark simulations can be found on the individual wiki pages for each GEOS-Chem version listed below.
2. For versions prior to v7-04-12, please see the GEOS-Chem version history web page.

--Bob Y. 15:25, 16 January 2014 (EST)

Current GEOS-Chem version in development

Version	Expected release	Important features	Benchmark history
GEOS-Chem v10-01	Late 2014	UCX chemistry mechanism; HEMCO, Online radiative transfer	v10-01 history

--Bob Y. 09:43, 25 April 2014 (EDT)

Previously released GEOS-Chem versions

NOTE: Each new GEOS-Chem version since v9-01-02 is now evaluated with one or more 1-year benchmark simulations prior to release. Therefore, each new GEOS-Chem version is now equivalent to what we used to call a "public release" prior to v9-01-02. We have since stopped using the terms "public release" and "beta release".

Version	Date Released	Important features	Benchmark history
GEOS-Chem v9-02	17 Jan 2014 (provisional) 03 Mar 2014 (public)	Updated soil NOx emissions module, POPs simulation, Inorganic chemistry updates, Methyl peroxy nitrate chemistry, Adopt Paulot isoprene scheme as standard, RCP emission scenarios, AEIC aircraft emissions inventory, GEOS-FP met fields	v9-02 history
GEOS-Chem v9-01-03	14 Sep 2012	Updated acetone sources & sinks; Improved sea salt emission & deposition; Improved snow scavenging and washout parameterization; Tropospheric bromine chemistry; Stratospheric P and k (monthly climatological)	v9-01-03 history
GEOS-Chem v9-01-02	28 Nov 2011	APM aerosol microphysics; GFED3 biomass emissions; RETRO Anthropogenic Emissions; Various fixes to correct several identified issues	v9-01-02 history
GEOS-Chem v9-01-01	07 Jun 2011	Compatibility with the GMAO MERRA met data product; Updated lightning NOx; various fixes	v9-01-01 history
GEOS-Chem v8-03-02	07 Sep 2010	Updated Hg and CO2 simulations
GEOS-Chem v8-03-01	04 May 2010	ISORROPIA II; TOMAS microphysics option; Updates to SOA and photolysis
GEOS-Chem v8-02-04	24 Feb 2010	LINOZ strat chemistry; NEI2005 anthro emissions; MEGAN v2.1 biogenic emissions
GEOS-Chem v8-02-03	Oct 2009	KPP solver; ICOADS emissions; Updated makefile structure
GEOS-Chem v8-02-02	08 Jun 2009	Non-local PBL mixing scheme; Updated Bond BC & OC emissions
GEOS-Chem v8-02-01	26 May 2009	Updated chemistry & photolysis reactions; Glyoxal chemistry mechanism
GEOS-Chem v8-01-04	10 Mar 2009	Various emissions updates (regional & global inventories); GFED2 biomass emissions updates
GEOS-Chem v8-01-03	Dec 2008	Installation of GMI TPCORE routine
GEOS-Chem v8-01-02	Nov 2008	Nested grid simulations for 0.5° x 0.666°
GEOS-Chem v8-01-01	May 2008	Capability to run with GEOS-5 met fields
GEOS-Chem v7-04-13	Nov 2007	H2/HD simulation; Bug fixes in SMVGEAR, lightning, and dynamic tropopause
GEOS-Chem v7-04-12	Oct 2007	Introduction of dynamic tropopause

--Bob Y. 15:25, 16 January 2014 (EST)

Mean OH from GEOS-Chem 1-year benchmark simulations

Here is a plot of the mean OH concentration from several recent GEOS–Chem 1-year benchmark simulations. The mean OH is an indicator how the chemistry mechanism is performing. Typical values are 10–12 x 10⁵ molecules cm^-1.

--Bob Y. 12:41, 17 January 2014 (EST)

GEOS–Chem Benchmarking Procedure

GEOS-Chem Benchmarking Protocol
adopted at the 5th International GEOS-Chem Meeting (May 2011)

1. Any change to the GEOS–Chem source code will require a dedicated 1-month "full-chemistry" benchmark and a version update code a,b,c... (such as v9–02a). These final letter codes are for internal use only and do not represent a version release. The benchmark results will be posted publicly with an email sent to the GEOS–Chem Steering Committee.

2. The developer will assess the benchmark results by filling out a form (created by Colette Heald and adapted to a wiki page) for all to see. If the developer has any concerns about the benchmark results they will contact the GEOS-Chem Support Team, the relevant GEOS–Chem Working Group Chairs, or Model Scientist Daniel Jacob. GEOS–Chem Steering Committee members can also comment on the benchmark results if they desire.

3. Once the developer is satisfied, GEOS–Chem Model Scientist Daniel Jacob will quickly review the results and approve the new internal version.

4. 1-year benchmarks for these internal version updates will be conducted only if justifiably requested by the developer or by GEOS–Chem Steering Committee members.

5. Each new version release (such as v9–02) will be subject to a 1-year benchmark to be inspected by the GEOS–Chem Steering Committee before approval (as was done for v9–01–01). Changes will be bundled so that we will have new versions released only every 9 months or so — this has been our rhythm in recent years.

Also, for each new version, we shall perform a standard 1-year Rn-Pb-Be simulation. This type of simulation is useful in examining if there are any significant impacts in convection or wet scavenging.

For more information about the standard 1-month and 1-year benchmark simulations, please see our GEOS-Chem Benchmarking web page.

--Bob Y. 10:31, 3 August 2011 (EDT)