GEOS-Chem versions

NOTE: The order in which various updates enter into the standard GEOS-Chem code may differ than what is listed here, depending on circumstances.

v8-01-04

Also adds:

• Hongyu Liu's fix: set random cloud overlap as the default option for FAST-J photolysis

v8-01-03

Also adds:

• EPA/NEI99 California transport sector fix
• Updated MEGAN annual emission factors for isoprene
• PERHAPS -- Updated mercury simulation (cf. Noelle, Elsie, Chris, Sarah Strode, etc.)

v8-01-02

Also adds:

• May Fu's updated chemistry mechanism ???
• New scale factors for anthropogenic emissions (cf. Aaron van Donkelaar)

v8-01-01

PUBLIC RELEASE scheduled for April 2008

Contains everything in v7-04-13, with the following additions:

• This is the first version to be compatible with GEOS-5 met fields.

1-Year Benchmarks

Description

• Results from v8-01-01 1-year benchmark simulation (w/ GEOS-5 met) are contained in the FTP directory:

/pub/geos-chem/1yr_benchmarks/v7-04-12/geos5/2005/Run

• This benchmark uses the same input conditions and emissions as v7-04-13. The only difference is that this benchmark was done w/ GEOS-5 met and v7-04-13 was done w/ GEOS-4 met.

The 3 models compared (and their colors on the plots) were:

Color	Quantity Plotted	Met Field Type	Lightning algorithm
Red	v7-04-12 Run2	GEOS-4 4x5	near-land w/ OTD-LIS regional scaling
Green	v7-04-13	GEOS-4 4x5	updated non-near-land w/ OTD-LIS local scaling
Blue	This model version	GEOS-5 4x5	updated non-near-land w/ OTD-LIS local scaling
Black	Observations

Release Notes

• We have implemented the fix for the Last year of GFED2 biomass emissions, (which is now 2006) into v8-01-01.

v7-04-13

BETA RELEASE November 2007

Contains everything in v7-04-12, with the following additions:

• Offline H2/HD simulation (cf. Lyatt Jaegle et al)
• Bug fix in "smvgear.f" -- due to a design flaw, you could have a situation where you could have negative or zero tracer in a box even if the global & local error criteria were satisfied. If this condition is encountered, we now revert to the concentrations at the end of the previous internal timestep, and then reduce the internal timestep and try again until we get convergence.
• Bug fix -- replace GEMISNOX w/ module arrays to avoid common block errors in lightning & aircraft NOx emissions
• Bug fix -- cap variable tropopause at 200hPa for polar regions (90S-60S and 60N-90N)
• Lee Murray's local lightning redistribution of lightning flashes
• Minor bug fixes for GCAP and diagnostics

1-Year Benchmarks

Description

• Results from 1-year benchmark simulation (w/ GEOS-4 met) are contained in the directory: <tt/pub/geos-chem/1yr_benchmarks/v7-04-12/geos4/2005/Run
• This benchmark uses the same input conditions and emissions as v7-04-12-Run2, except for the updated lightning emissions as described above.

The 3 models compared (and their colors on the plots) were:

Color	Quantity Plotted	Met Type	Lightning algorithm
Red	v7-04-12 Run1	GEOS-4 4x5	ancient
Green	v7-04-12 Run2	GEOS-4 4x5	near-land w/ OTD-LIS regional scaling
Blue	This model version	GEOS-4 4x5	updated non-near-land w/ OTD-LIS local scaling
Black	Observations

Release Notes

• The Last year of GFED2 biomass emissions is still 2005 in this version. If you want to use the 2006 emissions you will have to edit the source code module "gfed2_biomass_mod.f".

v7-04-12

BETA RELEASE October 2007

We have already done the following 1-year benchmark simulations:

1-Year Benchmarks

Run0

In FTP directory: /pub/geos-chem/1yr_benchmarks/v7-04-12/geos4/2001/Run0

• Run w/ 4x5 GEOS-4 for met field year 2001 (spun up thru 2000 & 1999)
• with G-C "old" fossil fuel (GEIA + EPA/NEI99)
• with G-C "default" climatological biomass burning
• with old lightning parameterization
• with MEGAN biogenic emissions
• with SMVGEAR chemistry up to dynamic tropopause
• with new dust emissions (w/ GOCART source function)
• with new TOMS/SBUV ozone columns for FAST-J photolysis
• with variable tropopause on

Run1

In FTP directory: /as2/pub/ftp/pub/geos-chem/1yr_benchmarks/v7-04-12/geos4/2005/Run1

• Run w/ 4x5 GEOS-4 for met field year 2005 (spun up thru 2003 & 2004)
• with G-C "old" fossil fuel (GEIA + EPA/NEI99)
• with G-C "default" climatological biomass burning
• with old lightning parameterization
• with MEGAN biogenic emissions
• with SMVGEAR chemistry up to dynamic tropopause
• with new dust emissions (w/ GOCART source function)
• with new TOMS/SBUV ozone columns for FAST-J photolysis
• with variable tropopause on

Run2

In FTP directory: /pub/geos-chem/1yr_benchmarks/v7-04-12/geos4/2005/Run2

• Run w/ GEOS-4 for met field year 2005 (spun up thru 2003 & 2004)
• with G-C "old" fossil fuel (GEIA + EPA/NEI99)
• with G-C "default" climatological biomass burning
• with new lightning parameterization (with OTD/LIS v2 regional redistribution of flashes)
• with MEGAN biogenic emissions
• with SMVGEAR chemistry up to dynamic tropopause
• with new dust emissions (w/ GOCART source function)
• with new TOMS/SBUV ozone columns for FAST-J photolysis
• with variable tropopause on

Results

Release Notes

1. Variable tropopause has bug fix from v7-04-11 but not 200 hPa cap at polar latitudes
2. NOTE: There is a bug in this version when lightning emissions are turned off. The bug will be fixed in v7-04-13. For the time being, if you must turn lighting emissions off in v7-04-12, please do this by setting FLASHRATE = 0 in the lightning_nox_nl_mod.f.