GEOS-Chem 14.0.0

GEOS-Chem Versions Page

This page includes information about GEOS-Chem 14.0.0 (currently under development).

Version overview

The following items have been added to GEOS-Chem 14.0.0 since the last GEOS-Chem version GEOS-Chem 13.4.0. Also see the following Github pages:

• 14.0.0 milestone for geoschem/geos-chem
• 14.0.0 milestone for geoschem/GCHP
• 3.5.0 milestone for geoschem/HEMCO

Feature	Contributor(s)	Model scope	Notes and references
Updates that will affect full-chemistry benchmark simulations
Fix bugs causing differences when splitting up GC-Classic and GCHP simulations in time	Lizzie Lundgren (GCST)	Initialization	geoschem/geos-chem PR #1229 GCHP fullchem simulations now identical if broken up in time Differences in GCClassic persist due to I/O precision limitation of HEMCO
Remove unnecessary met-fields from GCClassic restart file that caused incorrect initial meteorology	Lizzie Lundgren (GCST)	Restart files	geoschem/geos-chem PR #1250
Updates that will NOT affect full-chemistry benchmark simulations
Convert input.geos to geoschem_config.yml	Bob Yantosca (GCST)	Input files	geoschem/geos-chem PR #1128
Update to KPP 2.5.0	Bob Yantosca (GCST)	Structural	geoschem/geos-chem PR #1258
Change 4D State_Chm%Species array to vector of 3D concentration arrays	Lizzie Lundgren (GCST)	Structural	geoschem/geos-chem PR #990
Fix to save boundary conditions on first timestep	Eloise Marais (UCL)	Diagnostics	geoschem/geos-chem PR #1268
Fix bug in total OC diagnostic	Lizzie Lundgren (GCST)	Diagnostics	geoschem/geos-chem PR #1229
Avoid div-by-zero in routine MMR_Compute_Flux	Bob Yantosca (GCST)	Bug fix	geoschem/geos-chem PR #1216
Updates that will only affect GCHP
Upgrade GMAO libraries in GCHP	Liam Bindle (GCST) Lizzie Lundgren (GCST)	Structural	geoschem/GCHP PR #214
Add option to use native GEOS-FP met fields in GCHP Includes choice of mass fluxes or derived winds for advection	Liam Bindle (GCST)	Met fields	geoschem/geos-chem PR #1230
Bug fixes for MEGAN HEMCO extension	Lizzie Lundgren (GCST)	Emissions	geoschem/HEMCO PR #140

New data directories

The following data directories have been added or updated in this version. You will have to download the directories relevant to your simulation.

Inventory	Simulations	What was added?	Directory
GEOS-FP	All	Native GEOS-FP met fields at c720 resolution (~12 km), includes mass fluxes and derived winds. Using these fields is an option in GCHP.	ExtData/GEOS_C720

1-month full-chemistry benchmarks

1-month benchmark setup

The following table describes the GEOS-Chem setup for both GEOS-Chem Classic and GCHP 1-month benchmark simulations.

Git tag(s):	GEOS-Chem Classic: TBD GCHP: TBD HEMCO: TBD
Compared to previous benchmark:	13.4.0
Software environment:	gcc 10.2.0 OpenMPI 4.1.0 netcdf-fortran 4.5.3 CMake 3.17.3 ESMF 8.0.1
Model resolution:	GEOS-Chem Classic: 4° x 5° GCHP: c24
Meteorology fields:	MERRA-2 GEOS-Chem Classic: 4° x 5° GCHP: 0.5° x 0.625°
Initial conditions:	July 1, 2019 NOTE: GCHP c48 restart file regridded from GEOS-Chem Classic 4° x 5°
Benchmark month:	July 2019
Emissions setup:	TBD
Chemistry setup:	TBD
This version will impact: (select all that apply with boldface)	Emissions Photolysis Chemistry Dry Deposition Wet Deposition Advection BL Mixing Convection Meteorology Fields Other (please specify):

1-month internal benchmarks

Each update that will introduce a significant change in the full-chemistry simulation is tagged with an alpha version in Git. For each of these alpha versions, the GCST runs an internal 1-month benchmark simulation to isolate the impact from that update.

For more details on the update(s) included in each alpha version and a link to benchmark results, see this Google sheet.