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.

Merged and awaiting release

See the links below for items merged and awaiting release.

Patch version in development Minor version in development
GEOS-Chem 13.1.3 GEOS-Chem 13.2.0

Feature integration in progress

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."
Updated offline dust emissions Yanshun Li (WUStL) Emissions Easy
Updates to enable automated run directory creation GCST Run directory Medium
Modularize FAST-JX Lizzie Lundgren (GCST) Structural Difficult
  • Will allow other models to use FAST-JX without rest of GEOS-Chem

Feature integration in the queue

Feature Contributor(s) Model scope Ease of implementation Notes
Dust emissions from Meng et al. (in review) Jun Meng (WUStL)
Yanshun Li (WUStL) 		Emissions Easy
Updated Rn-222 emissions Bo Zhang Emissions Easy
Climatologies for lightning NOx Lee Murray (Rochester) Emissions Easy
C2H4 and C2H2 chemistry Kelvin Bates (Harvard)
Ke Li (Harvard) 		Chemistry Medium
HMS chemistry Jonathan Moch (Harvard) Chemistry Medium
Updated aerosol dry deposition Jeff Pierce (CSU) Dry deposition Easy
Adaptive chemical solver (as option) Lu Shen (Harvard) Chemistry Difficult
Joint CO2-CO-CH4-OCS simulation Beata Bukosa (NIWA)
Kevin Bowman (JPL) 		Specialty simulation Medium

Feature integration not yet prioritized

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
Updated Hg chemistry Viral Shah (Harvard)
Colin Thackray (Harvard) 		Chemistry Medium
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)

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
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
Aromatic VOC chemistry Kelvin Bates (Harvard)
Ke Li (Harvard) 		Chemistry
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
Add capability to read mass fluxes for use in advection Sebastian Eastham (MIT) Transport
  • Identified as a priority for GC 13, but not yet delivered
  • GCHP only

Over the horizon (6-12 months)

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)

Feature Contributor(s) Model scope Notes
GCHP Adjoint Daven Henze (CU Boulder) Structural
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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