GEOS-Chem model development priorities

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On this page we list the current priorities for GEOS-Chem development. This list is continuously updated based on code readiness and input from the Working Groups and the Steering Committee. For history of past releases see the GEOS-Chem Versions wiki page.

Release schedule

Please see the GEOS-Chem Release Proposal outlining the procedure and schedule for releasing GEOS-Chem versions.

Merged and awaiting release

See the links below for items merged and awaiting release.

Patch version in development Minor version in development
TBD GEOS-Chem 13.3.0

Feature integration in progress

Features listed in this table are actively being integrated into GEOS-Chem by the GEOS-Chem Support Team.

Feature Contributor(s) Model scope Ease of implementation Notes
Update US emissions to NEI2016 (as option) Barron Henderson (EPA)
Lyssa Freese (MIT) 		Emissions Easy
  • Files available at this ftp site. Barron writes, "They have not yet been used in a publication, so I caution users to look for anything and report back."
Updates to enable automated run directory creation Liam Bindle (GCST)
Melissa Sulprizio (GCST) 		Run directory Medium
Upgrade Fast-J to Cloud-J Lizzie Lundgren (GCST) Structural Difficult
Migrating sulfate chemistry into KPP Mike Long (GCST) Chemistry &
Structural 		Difficult
  • Complete but needs validation & further testing
Updated Hg chemistry in KPP Viral Shah (Harvard)
Colin Thackray (Harvard)
Mike Long (Harvard) 		Chemistry Medium
Aromatic VOC chemistry Kelvin Bates (Harvard)
Ke Li (Harvard)
Mike Long (Harvard) 		Chemistry Medium
Updated offline dust emissions from Meng et al. (2021) Jun Meng (WUStL)
Yanshun Li (WUStL) 		Emissions Easy
Add capability to read mass fluxes for use in advection Sebastian Eastham (MIT) Transport Easy
  • Identified as a priority for GC 13, but not yet delivered
  • GCHP only
GEOS updates Christoph Keller (GMAO)
Lizzie Lundgren (GCST) 		GEOS Medium (ongoing)
CESM-GC updates Thibaud Fritz (MIT)
Lizzie Lundgren (GCST) 		CESM Medium (ongoing)
GMAO library version updates Tom Clune (GMAO)
Ben Auer (GMAO)
Atanas Trayanov
GCST 		GCHP Medium (ongoing)
GCHP Adjoint updates Colin Lee (Wash U.) GCHP Adjoint Medium (ongoing)

Feature integration in the queue

Features listed in this table have been delivered to the GEOS-Chem Support Team and are prioritized to be integrated into GEOS-Chem in the near future.

Feature Contributor(s) Model scope Ease of implementation Notes
Updated Rn-222 emissions Bo Zhang Emissions Easy
Climatologies for lightning NOx Lee Murray (Rochester) Emissions Easy
Updated aerosol dry deposition Jeff Pierce (CSU) Dry deposition Easy
Updates to IONO2 hydrolysis from Wang et al. (2021) Tomas Sherwen (York) Chemistry Medium
Joint CO2-CO-CH4-OCS simulation Beata Bukosa (NIWA)
Kevin Bowman (JPL) 		Specialty simulation Medium
Adaptive chemical solver (as option) Lu Shen (Harvard) Chemistry Difficult
  • Needs to be merged with Bob Yantosca's gckpp_HetRates.F90 updates slated for 13.3.0

Feature integration not yet prioritized

Features listed in this table have been delivered to the GEOS-Chem Support Team but are not yet prioritized for integrating into the model.

Feature Contributor(s) Model scope Ease of implementation Notes
Stratospheric HCN chemistry Armin Kleinbohl (JPL)
Debra Weisenstein (Harvard, retired) 		Chemistry Medium
  • Delivered to GCST (Jun 2020)
MEGAN3 Sam Silva (MIT) Emissions Medium
GC-YIBs biosphere-atmospheric chemistry coupled model Xu Yue (NUIST) Science Easy
Ecophysiology module in GEOS-Chem for biosphere-atmosphere exchange Joey Lam(CUHK)
Amos Tai (CUHK) 		Science Easy
Extend UCX into the mesosphere Sebastian Eastham (MIT)
Eric Fleming (NASA GMAO) 		Chemistry Easy
Archived CMIP6 Met Products for GEOS-Chem Input Lee Murray (Rochester) Input data Easy
Landcover/Fire Emissions Offline LPJlmfire Loretta Mickley (Harvard)
Yang Li (Harvard) 		Emissions Easy
  • Data files delivered to GCST (July 2021)
Canopy Physics Model Sam Silva (MIT) Science Medium

Almost there (< 6 months)

Features listed in this table are in development and will likely be delivered to the GEOS-Chem Support Team within the next 6 months.

Feature Contributor(s) Model scope Notes


Implement H2 chemistry in UCX Chris Holmes (FSU) Chemistry
  • Identified as a priority for GC 13, but not yet delivered


New soil NOx parameterization Yi Wang (U. Iowa)
Jun Wang (U. Iowa) 		Emissions
Updated offline biogenic emissions Hongjian Weng (PKU) Emissions
  • Identified as a priority for GC 13, but not yet delivered
  • Waiting on updated MODIS LAI data
Updated offline sea salt emissions Hongjian Weng (PKU) Emissions
  • Identified as a priority for GC 13, but not yet delivered
Updated offline soil NOx emissions Hongjian Weng (PKU) Emissions
  • Identified as a priority for GC 13, but not yet delivered
Provide recommended rather than hard-coded scaling factors for online emissions GCST Emissions
  • Identified as a priority for GC 13, but not yet developed
Provide climatologies for volcano emissions GCST Emissions
  • Identified as a priority for GC 13, but not yet developed
Provide climatologies for open fire emissions GCST Emissions
  • Identified as a priority for GC 13, but not yet developed
Diagnostic to archive XCO2, XCO, and XCH4 Dylan Jones (Toronto) Diagnostic
Provide archived TCR-2 GEOS-Chem OH fields for carbon simulations Kazu Miyazaki (JPL) Input data
BrC aging Xuan Wang (Harvard)
Melanie Hammer(Dalhousie) 		Chemistry
Shared Socioeconomic Pathways Emission Inventories Hong Liao (NUIST) Emissions
Rediagnosis of RAS convection in GEOS-Chem Tailong He (Toronto)
Dylan Jones (Toronto)
Andrea Molod (NASA/GMAO) 		Convection
  • Work is finished and a manuscript is in preparation.
Read-in of native GEOS output WUStL GCST Input data
  • GCHP only
Change GCHP advection inputs to use total pressure and mixing ratio rather than dry Sebastian Eastham (MIT) Transport
  • Identified as a priority for GC 13, but not yet delivered
  • GCHP only
HTAPv3 emissions (0.1 deg, 2002-2018) Emissions & Deposition WG Emissions
Migrating simple SOA formation from carbon_mod.F90 into the KPP "full-chemistry" mechanism GCST Chemistry

Over the horizon (6-12 months)

Features listed in this table are in development and will likely be delivered to the GEOS-Chem Support Team in the 6-12 months timeframe.

Feature Contributor(s) Model scope Notes
Methylethylketone chemistry Jared Brewer (CSU) Chemistry
Add sulfate dependence to SOA yield from isoprene in simple SOA Eloise Marais (Leicester) Chemistry
GTMM updates Ben Geyman (Harvard) Hg simulation


Integrating GMAO's tracer gridded component in GCHP Christoph Keller (NASA GMAO) Transport Tracer simulation
Streamlining of specialty simulations through HEMCO and KPP GCST Chemistry, Specialty simulations

Longer term (12-24 months)

Features listed in this table are in development and will likely be delivered to the GEOS-Chem Support Team in the 12-24 months timeframe.

Feature Contributor(s) Model scope Notes
Implement isotope simulation for CO and CH4 in GCHP Lee Murray (Rochester) Specialty simulation
Migrate LETFK DA scheme to GCHP Kazu Miyazaki (JPL) Structural
Super fast chemistry scheme Benjamin Brown-Steiner (AER)
Makoto Kelp (Harvard) 		Chemistry
  • SF mechanism has been implemented and benchmarked in GEOS-Chem 12.0.0. This mechanism is of interest for those groups wanting fast global simulation of oxidation fields in GEOS-Chem simulations focused on aerosol microphysics.
  • The machine-learned chemical solver is still probably 12 months away from online implementation into GEOS-Chem.
Add non-volatile cations to ISORROPIA Becky Alexander (UW) Aerosols
DMS oxidation scheme updating Becky Alexander (UW)
Qianjie Chen (UW) 		Chemistry
  • Delayed - implemented pre-KPP
  • Currently bring implemented in KPP by UC Riverside group
Heterogeneous sulfate production Lin Zhang (PKU)
Becky Alexander (UW)
Yuxuan Wang (U. Houston) 		Chemistry
  • Delayed - implemented pre-KPP
Hg in WRF-GC Yanxu Zhang (Nanjing) Hg simulation
Hg with blowing snow Yanxu Xhang (Nanjing) Emissions, Hg simulation
Hg isotopes Xiaotian Xu, Yanxu Xhang (Nanjing) Hg simulation
Hg in CESM CAM-CHEM Peng Zhang, Yanxu Xhang (Nanjing) Hg simulation
Complex / multicomplex variables Shannon Capps (Drexel) Structural

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