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
New version of MAPL GMAO
Lizzie Lundgren (GCST)

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
N2O5, NO3, NO2 reactive uptake updates Viral Shah (UW)
Lyatt Jaegle (UW)
Chris Holmes (FSU)
Erin McDuffie (Dalhousie)
  • Delivered to GCST (Dec 2018)
Cloud reactive uptake of NOx Chris Holmes (FSU) Science
Photolysis of NITs (off by default) Tomas Sherwen (York)
Prasad Kasibhatla (Duke)
  • Delivered to GCST (Mar 2019)
Emissions and surface fluxes updates
MEIC emissions over China (2000-2017) Qiang Zhang (Tsinghua)
Lu Shen (Harvard)
  • Available on a collaborative basis; contact developer Qiang Zhang
Updates to cold-temperature deposition Lyatt Jaegle (UW) Science
Simple parameterization for CO2 dependence of stomatal resistance Amos Tai (CUHK) Science
Wet deposition updates
Wet deposition parameterizations: Henry's law coefficients, etc. Sarah Safieddine (MIT) Science
Aerosol updates
Update to hygroscopic growth Robyn Latimer (Dalhousie)
Randall Martin (Dalhousie)
Sea salt emissions from sea ice Jiayue Huang (UW) Science
Heterogeneous sulfate production Lin Zhang (PKU)
Becky Alexander (UW)
Yuxuan Wang (U. Houston)
  • Described by Shao et al., ACPD, 2019
Transport updates
ND49 timeseries diagnostic for correcting ozone from the height of the lowest model level to 10m Katie Travis (MIT) Science
Structural updates
Carbon cycle outputs in xCO2, xCH4 as a diagnostic Beata Bukosa (Wollongong)
Dylan Jones (U. Toronto)

--Melissa Sulprizio (talk) 13:13, 19 February 2019 (UTC)

Almost there (< 6 months)

Item Author(s) Type Status
Transport updates
GEOS resolution & subgrid convection Karen Yu (Harvard)
Bob Yantosca (GCST)
Tailong He (Toronto)
  • Installed in 12.1.0 by Bob Yantosca (Harvard), currently being tested by Tailong He (Toronto)
GCHP updates
Use CMake to simplify GCHP and GEOS-Chem "Classic" build process Liam Bindle (Dalhousie) Structural
  • Work in progress
Structural updates
Replace HEMCO built-in unit conversions with scale factors in config file GCST Structural
  • Differences in precision and order of operations may result in small number differences

--Melissa Sulprizio (talk) 13:13, 19 February 2019 (UTC)

Over the horizon (6-12 months)

Item Author(s) Type Status
Ecophysiology module in GEOS-Chem for biosphere-atmosphere exchange Amos Tai (CUHK) Science
Additional modifications for FlexChem, including:
  • Migrating specialty chemistry mechanisms (e.g. CH4, CO2) to KPP
  • Add capability for custom chemistry mechanism by building KPP on-the-fly in GEOS-Chem
GCST Structural

--Melissa Sulprizio (talk) 15:46, 3 May 2019 (UTC)

Longer term (12-24 months)

Item Author(s) Type Status
None at this time

--Melissa Sulprizio (talk) 13:13, 19 February 2019 (UTC)

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