GEOS-Chem 13.4.0

GEOS-Chem Versions Page

This page includes information about GEOS-Chem 13.4.0 (currently under development)

Version overview

The following items have been added to GEOS-Chem 13.4.0 since the last GEOS-Chem version GEOS-Chem 13.3.1. Also see the following Github pages:

• 13.4.0 milestone for geoschem/geos-chem
• 13.4.0 milestone for geoschem/GCHP

Feature	Contributor(s)	Model scope	Notes and references
Updates that will affect full-chemistry benchmark simulations
Fix bug in Henry law CALC_HEFF routine in hetchem computations	Viral Shah (Harvard)	Chemistry	geoschem/geos-chem PR #1042 geoschem/geos-chem #1001
Bug fix: Remove double-counting of HCl uptake on acidic sea salt	Viral Shah (Harvard)	Chemistry	geoschem/geos-chem PR #1041 geoschem/geos-chem #1034
Update surface resistance for ozone deposition to ice/snow	Ryan Pound (York) Shuting Zhai (UW)	Drydep	geoschem/geos-chem PR #1055 geoschem/geos-chem #997
Use updated definition of PM2.5; Add PM10 diagnostic	Bob Yantosca (GCST)	Diagnostics & Benchmarking	geoschem/geos-chem PR #992 Particulate Matter in GEOS-Chem (wiki) This update will cause PM2.5 diagnostic output to change slightly, which will be reflected as differences in benchmark plots
HEMCO bug fix: restore archiving via manual diagnostics (which had been inadvertently disabled in a prior update)	Melissa Sulprizio (GCST) Bob Yantosca (GCST)	Emissions	geoschem/HEMCO PR #121 Causes minor changes (less than 0.3%) in biogenic emissions, because the HEMCO MEGAN extension uses manual diagnostics internally. For more details, see this Github comment.
Use degassing-only volcano emissions in GEOS-Chem benchmark simulations	Christoph Keller (GMAO) Daniel Jacob (Harvard)	Emissions & Benchmarking	geoschem/geos-chem #1005 This will make it easier to compare results to past benchmarks in case the benchmark year should change.
Updates that will NOT affect full-chemistry benchmark simulations
Updates to enable automated run directory creation	Liam Bindle (GCST) Melissa Sulprizio (GCST)	Run directory	geoschem/geos-chem PR #459 Zero-diff update
Bug fix: Use REAL*8 precision in for CH3O2 + OH reaction definition in fullchem.eqn	Bob Yantosca (GCST)	Chemistry	geoschem/geos-chem #951 Zero-diff update
Updated Rn-222 emissions for TransportTracers simulations	Bo Zhang (NIA)	Emissions	geoschem/HEMCO #120 Existing Rn emissions will remain as an option
Updates that will only affect GCHP
Define a GCHP "Default" collection that will archive a small number of commonly-requested diagnostic fields	Liam Bindle (GCST)	Diagnostics	geoschem/geos-chem PR #1008

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	Type	What was added?	Directory
ZHANG_Rn222	Optional	Updated Rn222 emissions for TransportTracers simulations (cf Bo Zhang et al (2021))	HEMCO/ZHANG_Rn222/v2021-11