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.

We also invite you to view our GEOS-Chem Support Team project management board on, which shows the current GCST workflow.

Priorities assigned to upcoming GEOS-Chem versions


This version is currently in development. See the GEOS-Chem 12 wiki page for details.


Feature Submitted by Type Status
Retire obsolete emission inventories Eloise Marais (Leicester)
Update GCHP to use MAPL v1.0.0 and ESMF v8.0.0 beta snapshot 28 Lizzie Lundgren (GCST) Structural
  • Replaces external tile files with online ESMF regridding weights
  • Includes parallel file I/O module
  • Enables use of GNU fortran compiler
Enable GEOS-Chem "Classic" netCDF (History) diagnostics to be subsetted vertically and horizontally GCST Structural
  • Undergoing validation (Jun 2019)
Add capability to compile GEOS-Chem Classic and GCHP using CMake Liam Bindle (Dalhousie) Structural
Enable accurate cloud pH diagnostic calculation via post-processing Jonathan Moch (Harvard) Structural
  • Applies to NetCDF diagnostic only


This version will require 1-month and 1-year full-chemistry benchmarks.

Feature Submitted by Type Status

N2O5, NO3, NO2 reactive uptake updates Viral Shah (UW)
Lyatt Jaegle (UW)
Chris Holmes (FSU)
Erin McDuffie (Dalhousie)
  • Delivered to GCST (Dec 2018)
HNO3 cold-temperature deposition Viral Shah (Harvard) Science
Bug in aerosol pH calculation when dry Becky Alexander (UW)
Xuan Wang (Harvard)
Remove isoprene in VBS (leaving aqueous) GCST w/ guidance from Sid Pai (MIT) Science
Historical biomass burning emissions (1750-2014, BCC4CMIP and LPJ-LMfire) Pengfei Liu (Harvard) Science
Checked GFED4 version used by HEMCO Siddhant Pai (MIT) Science
  • Older versions have bugs
Surface diagnostic (O3, HNO3) with user-selected height Katie Travis (MIT)
Updated aerosol hygroscopicity and optics Robyn Latimer (Dalhousie)
Jun Meng (Dalhousie)
Simple parameterization for CO2 dependence of stomatal resistance Amos Tai (CUHK) Science
Aerosol nitrate photolysis option (off by default) Tomas Sherwen (York)
Prasad Kasibhatla (Duke)
  • Delivered to GCST (Mar 2019)


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

Feature Submitted by Type Status
Subgrid cloud NOy chemistry Chris Holmes (FSU) Science


This version will require 1-month and 1-year full-chemistry benchmarks.

Feature Submitted by Type Status
Wet deposition parameterization Kelvin Bates (Harvard)


This version will require 1-month and 1-year full-chemistry benchmarks.

Feature Submitted by Type Status
Aromatic VOC chemistry Yingying Yan (PKU)
Jintai Lin (PKU)

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 Status
Chemistry updates
Implement H2 chemistry in UCX Chris Holmes (FSU) Science
Joint CO, CO2, CH4 simulation Beata Bukosa (Wollongong) Science
Emissions and surface fluxes updates
Updated Streets Hg emissions Colin Thackray (Harvard) Science
Updated EDGAR 4.3 Hg emissions Amanda Giang (UBC) Science
Offline CLM Harmonization Anthony Wong (BU)
Jeff Geddes (BU)
Aerosol updates
Arctic marine SOA Betty Croft (Dalhousie) Science
  • Details on wiki only, not in standard code

--Melissa Sulprizio (talk) 16:38, 14 May 2019 (UTC)

Almost there (< 6 months)

Item Author(s) Type Status
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
Evaluate the impact on the tropsophere of using the family approach for transport in the stratosphere Christoph Keller (NASA/GMAO) Science
Examine differences in the lightning NOx schemes in GEOS-Chem and GMI Christoph Keller (NASA/GMAO)
Lee Murray (Rochester)
Small alkyl nitrate chemistry Jenny Fisher (Wollongong) Science
Isoprene chemistry Kelvin Bates (Harvard) Science
HMS chemistry Jonathan Moch (Harvard) Science
Heterogeneous sulfate production Lin Zhang (PKU)
Becky Alexander (UW)
Yuxuan Wang (U. Houston)
Eliminate 27% scaling on semivolatile fire emissions for complex scheme Sidhant Pai (MIT) Science
BrC aging Xuan Wang (Harvard)
Melanie Hammer(Dalhousie)
APM update and integration with most recent GC version Gan Luo (SUNY-Albany)
Fangqun Yu (SUNY-Albany)
Retire carbon-based units for VOCs GCST Science
Ozone deposition to the ocean Ryan Pound (York)
Mat Evans (York)
Latitudinally and monthly resolved fixed surface concentrations for GGs back to 1850 Tomás Sherwen (York)
Lee Murray (Rochester)
Update of US emissions to NEI16 Barron Henderson (EPA) Science
Updated surface ocean dissolved Hg0 from MITgcm Yanxu Zhang (Nanjing) Science
HEMCO improvements Christoph Keller (NASA/GMAO)
Cmake in GEOS-Chem Liam Bindle (Dalhousie) Structural
One-Way Coupling w/ GISS ModelE3 Lee Murray (Rochester)
Eric Leibensperger (SUNY Plattsburgh)
Online Coupling w/ GEOS CCM Lizzie Lundgren (Harvard)
Lu Hu (U. MT)
Christoph Keller (NASA/GMAO)
Shared Socioeconomic Pathways Emission Inventories Hong Liao (NUIST) Science

--Melissa Sulprizio (talk) 16:38, 14 May 2019 (UTC)

Over the horizon (6-12 months)

Item Author(s) Type Status
Update OCS simulation in the standard code Kevin Bowman (JPL) Science
Examine what are the differences in the PSC implementation in GEOS-Chem and GMI and assess the implications of these differences for startospheric ozone Susan Strahan (Goddard)
Sebastian Eastham (MIT)
Rainout and washout update Gan Luo(SUNY-Albany)
Fangqun Yu (SUNY-Albany)
Rediagnosis of RAS convection in GEOS-Chem Tailong He (Toronto)
Dylan Jones (Toronto)
Andrea Molod (NASA/GMAO)
New schedule for tracer transport benchmarks (FP change, scavenging change, or major release) Andrea Molod (NASA/GMAO) Science
Methanol as part of standard chemical mechanism Dylan Millet (U Minnesota)
Katie Travis (NASA)
Updated cloud water pH Viral Shah (Harvard)
Jonathan Moch (Harvard)
Halogen chemistry update Tomas Sherwen (York)
Xuan Wang (Harvard)
Shuting Zhai (UW)
Methylethylketone chemistry Jared Brewer (CSU) Science
Add sulfate dependence to SOA yield from isoprene in simple SOA Eloïse Marais (Leicester) Science
Trace metal simulation Junwei Xu (Dalhousie) Science
Hg gas-phase photo-reduction Colin Thackray (Harvard) Science
Move GEOS-Chem Classic run directory creation from Unit Tester to source code GCST Structural
Dynamic diagnostic array size allocation based on settings in HISTORY.rc GCST Structural
Removal of binary punch diagnostics GCST Structural
GCPy 1-year benchmark and continued development GCST Structural
Ecophysiology module in GEOS-Chem for biosphere-atmosphere exchange Amos Tai (CUHK) Science
Canopy Physics Model Sam Silva (MIT) Structural
Landcover/Fire Emissions Offline LPJlmfire Loretta Mickley (Harvard) Science

--Melissa Sulprizio (talk) 16:38, 14 May 2019 (UTC)

Longer term (12-24 months)

Item Author(s) Type Status
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)
Add non-volatile cations to ISORROPIA Becky Alexander (UW) Science
Update Europe emissions to EMEP 2016 Eloise Marais (Leicester) Science
MEGAN3 Sam Silva (MIT)
Jen Kaiser (GIT)
Yuxuan Wang (UH)
DMS oxidation scheme updating Becky Alexander (UW)
Qianjie Chen (UW)
Streamlining of specialty simulations through HEMCO and KPP GCST
Chris Holmes (FSU)
Colin Thackray for POPs (Harvard)
Peter Ivatt (York) for PAH
Hg in WRF-GC Yanxu Zhang (Nanjing) Science
Hg with blowing snow Yanxu Xhang (Nanjing) Science
Updated treatment of Hg in ocean Chris Holmes (FSU) Science
GTMM updates Ben Geyman (Harvard) Science
Complex / multicomplex variables Shannon Capps (Drexel) Structural
Build KPP when you compile GC GCST Structural
Restructure source code folders GCST Structural
Archived CMIP6 Met Products for GEOS-Chem Input Lee Murray (Rochester) Science

--Melissa Sulprizio (talk) 16:38, 14 May 2019 (UTC)

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