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.

GEOS-Chem versions in development


See the GEOS-Chem 13.0.0 page for more details.

Priorities assigned to upcoming GEOS-Chem versions


This version will require a 1-month full-chemistry benchmark.

Feature Submitted by Type Notes
Distribute emissions vertically in the boundary layer Barron Henderson (EPA)
Structural &
  • Vertical profiles have been delivered to GCST
Diurnal scale factors of power plants emissions in China Hongjian Weng (PKU)
Jintai Lin (PKU)
Initial modifications for HEMCO internal grid Haipeng Lin (Harvard) Structural
Update GMAO submodules in GCHP GCST Structural


This version will require a 1-month and 1-year full-chemistry benchmarks, with and without Luo wet deposition.

Feature Submitted by Type Notes
Update US emissions to NEI2016 Barron Henderson (EPA)
Lyssa Freese (MIT)
  • 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."
Canopy Physics Model Sam Silva (MIT) Structural
Improved wet scavenging from Luo et al. (2020) (as option) Gan Luo (Albany)
Fangqun Yu (Albany)

Provide climatologies for lightning NOx, volcano, and open fire emissions GCST Science
Trace metal simulation Junwei Xu (Dalhousie) Science


This version will require a 1-month and 1-year full-chemistry benchmarks, with and without the adaptive chemical solver.

Feature Submitted by Type Notes
C2H4 and C2H2 chemistry Kelvin Bates (Harvard)
Ke Li (Harvard)
HMS chemistry Jonathan Moch (Harvard) Science
Blowing snow emissions of sea salt and sea salt bromide Lyatt Jaegle (UW) Science
Updated aerosol dry deposition Jeff Pierce (CSU) Science
Updated Yuan/BNU MODIS LAI product (2000-2019) Jenny Fisher (U. Wollongong) Science
  • Processing scripts delivered to GCST (Aug 2020)
Updated Rn-222 emissions Bo Zhang Science
Adaptive chemical solver (as option) Lu Shen (Harvard) Science

Priorities not yet assigned to a particular version

The following items have been identified as priorities for GEOS-Chem, but have not yet been assigned to a particular GEOS-Chem version.

Ready to go in

Feature Submitted by Type Notes

Implement H2 chemistry in UCX Chris Holmes (FSU) Science
Stratospheric HCN chemistry Armin Kleinbohl (JPL)
Debra Weisenstein (Harvard, retired)
  • Delivered to GCST (Jun 2020)
MEGAN3 Sam Silva (MIT) Science
GC-YIBs biosphere-atmospheric chemistry coupled model Xu Yue (NUIST) Science
Extend UCX into the mesosphere Sebastian Eastham (MIT)
Eric Fleming (NASA GMAO)

Almost there (< 6 months)

Item Author(s) Type Notes
Fix stratospheric flooding Sebastian Eastham (MIT) Science/Bug fix
Diagnostic to archive XCO2, XCO, and XCH4 Dylan Jones (Toronto) Science
Provide archived TCR-2 GEOS-Chem OH fields for carbon simulations Kazu Miyazaki (JPL) Science
Aromatic VOC chemistry Kelvin Bates (Harvard)
Ke Li (Harvard)
BrC aging Xuan Wang (Harvard)
Melanie Hammer(Dalhousie)
One-Way Coupling w/ GISS ModelE3 Lee Murray (Rochester) Structural
  • Work is finished and a manuscript is in preparation
Shared Socioeconomic Pathways Emission Inventories Hong Liao (NUIST) Science
Ecophysiology module in GEOS-Chem for biosphere-atmosphere exchange Amos Tai (CUHK) Science

Rediagnosis of RAS convection in GEOS-Chem Tailong He (Toronto)
Dylan Jones (Toronto)
Andrea Molod (NASA/GMAO)
  • Work is finished and a manuscript is in preparation.
Read-in of native GEOS output in GCHP WUStL GCST Science
Adoption of the Spack package manager for dependency management Harvard GCST Structural
Modularization of GEOS-Chem: FAST-JX as proof-of-concept NASA GMAO Structural

Over the horizon (6-12 months)

Item Author(s) Type Notes
Update OCS simulation in the standard code Kevin Bowman (JPL) Science
Methylethylketone chemistry Jared Brewer (CSU) Science
Add sulfate dependence to SOA yield from isoprene in simple SOA Eloise Marais (Leicester) Science
Updated Hg chemistry:
  • Streamlining of Hg simulation through HEMCO and KPP
  • Hg gas-phase photo-reduction
Viral Shah (Harvard)
Colin Thackray (Harvard)
GTMM updates Ben Geyman (Harvard) Science
Landcover/Fire Emissions Offline LPJlmfire Loretta Mickley (Harvard) Science
Aerosol dry deposition updates Jeff Pierce (CSU) Science
Integrating GMAO's tracer gridded component in GCHP Christoph Keller (NASA GMAO) Structural
Mass flux-based transport in GCHP Sebastian Eastham (MIT) Science
Streamlining of specialty simulations through HEMCO and KPP GCST Science

Longer term (12-24 months)

Item Author(s) Type Notes
GCHP Adjoint Daven Henze (CU Boulder) Science
Implement isotope simulation for CO and CH4 in GCHP Lee Murray (Rochester) Science
Migrate LETFK DA scheme to GCHP Kazu Miyazaki (JPL) Science
Super fast chemistry scheme Benjamin Brown-Steiner (AER)
Makoto Kelp (Harvard)
  • 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) Science
DMS oxidation scheme updating Becky Alexander (UW)
Qianjie Chen (UW)
  • 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)
  • Delayed - implemented pre-KPP
Hg in WRF-GC Yanxu Zhang (Nanjing) Science
Hg with blowing snow Yanxu Xhang (Nanjing) Science
Hg isotopes Xiaotian Xu, Yanxu Xhang (Nanjing) Science
Hg in CESM CAM-CHEM Peng Zhang, Yanxu Xhang (Nanjing) Science
Complex / multicomplex variables Shannon Capps (Drexel) Structural

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