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.
| Mergeable at any time | Version in development |
|---|---|
| GEOS-Chem no-diff-to-benchmark | GEOS-Chem 14.5.0 |
Feature integration in progress
Features listed in this table are actively being integrated into GEOS-Chem by the GEOS-Chem Support Team. In addition, we continuously implement structural updates in the model to maintain and develop coupling with other models including GEOS, CESM, and the model adjoint.
| Feature | Contributor(s) | Model scope | Ease of implementation | Notes and References |
|---|---|---|---|---|
| New soil NOx parameterization | Yi Wang (U. Iowa) Jun Wang (U. Iowa) |
Emissions | Medium |
|
| ALK4 & R4N2 chemistry | Jared Brewer (UMN) | Chemistry | Simple | |
| Horizontal flux regridding fix in MAPL | Tom Clune (GMAO) | GCHP | Medium | |
| Cloud-J 7.7.2 for greater flexibility in external models | Lizzie Lundgren (Harvard) | Photolysis | Medium |
|
| GCHP run directory improvements for mass flux, stretched grid, and GEOS-IT runs | Lizzie Lundgren (Harvard) | GCHP | Medium | |
| Fixes for GEOS-Chem 14.4 in CESM | Haipeng Lin (Harvard) Lizzie Lundgren (Harvard) |
CESM | Medium |
|
Prioritized and in the queue
Features listed in this table are prioritized for integration into GEOS-Chem in the near future.
| Feature | Contributor(s) | Model scope | Ease of implementation | Delivery status | Notes and References |
|---|---|---|---|---|---|
| New version of CEDS at 0.1 deg | Dandan Zhang (WashU) | Emissions | Simple | Delivered June 2024 | |
| Remove differences in GC-Classic due to HEMCO reading REAL8 restart as REAL4 | Lizzie Lundgren (Harvard) | GC-Classic | Medium |
Ready to go in
Features listed in this table are ready to go in but have either not been delivered or are not yet prioritized for integration into GEOS-Chem.
| Feature | Contributor(s) | Model scope | Delivery status | Notes and Refereneces
|
|---|---|---|---|---|
| Binary Activity Thermodynamic (BAT) model for non-ideal mixing of water and organics in organic aerosol | Camilo Serrano and Andreas Zuend (McGill) | Aerosols | Not delivered | |
| Extend aerosol settling | Eloise Marais (UCL) | Aerosols | Not delivered | |
| Comment back in Ca, Mg, and K cations in aerosol thermo (HETP) | Becky Alexander (UW) | Aerosols | Not delivered | |
| Seasalt aerosol from sea ice leads (2002-2011) | Hannah (UIUC) | Aerosols | Not delivered | |
| P/L species should not contribute to the error norm | Obin Sturm (USC) | Chemistry | Not delivered | |
| Additional 6 peroxynitrates (many PANs like species); improve ALK4 & add ALK6 | Katherine Travis (NASA LARC) | Chemistry | Not delivered | |
| Monoterpene oxidation more species & oxidation products | Kevin Bates (CU Boulder) | Chemistry | Not delivered | |
| PPN photolysis | Eloise Marais (UCL) | Chemistry | Not delivered | |
| Hlobal organic N dep from various emissions; nitrate aromatics updates | Tzung-May Fu (SUSTech) | Chemistry + Deposition |
Not delivered | |
| Adaptive chemistry (domain-specific) in WRF-GC | Tzung-May Fu (SUSTech) | Chemistry | Not delivered | |
| ALK4 from biogenic vs anthro | Jared Brewer (UMN) | Chemistry | Not delivered | |
| Dry deposition to F90 to improve readability | Chris Holmes (FSU) | Dry Deposition | Not delivered | |
| Ecophysiology module in GEOS-Chem for biosphere-atmosphere exchange | Joey Lam, Amos Tai (CUHK) | Dry deposition | Not delivered | |
| FRP-based fire emissions for eastern US at 0.2 | Chris Holmes (FSU) | Emissions | Not delivered | |
| China agriculture NH3 emissions | Amos Tai (CUHK) | Emissions | Not delivered | |
| T-dependent anthropogenic VOCs | May Fu (SUSTech) | Emissions | Not delivered | |
| New source functions for transport tracers beryllium-7 and beryllium-10 | Minjie Zheng (ETH) | Emissions | Not delivered | |
| LPJ land cover (global), fire (W US), dust emissions (SW N America), 1700-2100 | Yang Li (Baylor University), Loretta Mickley (Harvard) | Emissions | Not delivered | |
| Australian emissions | Stephen MacFarlane/Jenny Fisher (UWollongong) | Emissions | Not delivered | |
| Hg geogenic emissions (volcanic, rock weathering) | Eric Roy (MIT) | Emissions | Not delivered | |
| Hg biomass burning - FINN2.5 & GFED4 | Eric Roy (MIT) | Emissions | Not delivered | |
| BCC-GC online | Lin Zhang (PKU) | External Model | Not delivered | |
| GC-YIBS with online fire emissions | Xu Yue; Hong Liao; Xu Yue (NUIST) | External Model | Not delivered | |
| GISS-GC offline (GCAP) | Lee Murray (Rochester) | GCAP | Not delivered | |
| Archived TCR-2 OH fields for carbon simulations | Kazu Miyazaki (JPL) | Input data | Not delivered |
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 and References
|
|---|---|---|---|
| Capture all trop and PBL height changes in budget diagnostics | Chris Holmes (FSU) Lizzie Lundgren (Harvard) |
Diagnostics | |
| Dust non-sphericity impacts on optical properties | Inderjeet Singh (WashU) | Aerosols | |
| Fixes to stratospheric aerosol settling | Connor Barker, Eloise Marais (UCL) | Aerosols | |
| DMS chemistry in v14 | Linia Tashmim and Will Porter (UC Riverside) | Chemistry | |
| KPP standalone + 3D Interface | Obin Sturm (PSC) | Chemistry | |
| Load balancing in chemistry solver (GCHP) | Zhouran (Jordan) Sun (WashU) | Chemistry + Performance |
|
| UCX chemistry in mesosphere (GCHP/GCClassic) | Helena McDonald (MIT) | Chemistry | |
| Updated aromatic oxidation | Stephen MacFarlane/Jenny Fisher (University of Wollongong) | Chemistry | |
| MCO3 uptake by cloud forming MP; leading to lower PAN | Laura Yang (Harvard) | Chemistry | |
| Implement isotope simulation for CH4 in the carbon simulation | Lee Murray (Rochester) | Chemistry | |
| Active mesospheric chemistry | Helena McDonald (MIT), Seb Eastham (IC) | Chemistry | |
| Documentation for adding additional aerosol species | Connor Barker (UCL) | Documentation | |
| Column diagnostics | Lizzie Lundgren (Harvard), Viral Shah (GMAO) | Diagnostics | |
| TOMAS rate diagnostics -- improve performance | Betty Croft (WashU/Dal) | Diagnostics + Performance |
|
| Fix obspack - not working in 14.4.0 | Bob Yantosca (Harvard) | Diagnostics | |
| Archive gamma values from heterogeneous chemistry | Bob Yantosca (Harvard) | Diagnostics | |
| RRTMG Documentation | GCST | Documentation | |
| Canopy Physics Model | Sam Silva (MIT) | Dry Deposition | |
| Dry deposition diagnostics by land cover | Holly Nowell, Chris Holmes (FSU) | Dry Deposition | |
| Dry deposition process diagnostics | Holly Nowell, Chris Holmes (FSU) | Dry Deposition | |
| Biomass burning for TOMAS | Nicole June (CSU) | Emissions + Microphysics |
|
| Historic biomass burning () | Pengfei (Gtech) | Emissions | |
| Rice methane | Zichong Cheng (Harvard) | Emissions | |
| Fire and anthropogenic emissions not currently turned on (monoterpenes, 1-butadiene etc.) | Katie Travis / Kelvin Bates | Emissions | |
| Updated bottom-up global CH4 oil, gas, and coal emissions (GFEI v3) | Melissa Sulprizio (Harvard), Tia Scarpelli (Carbon MAPPER) | Emissions | |
| New prior biospheric fluxes from CMS-FLUX and GMAO | Kevin Bowman (JPL), Lesley Ott (GMAO) | Emissions | |
| Snowpack Br2 emission | Chris Holmes (FSU) | Emissions | |
| EDGAR v8.1_toxHg emissions for 1970-2022 | Eric Roy (MIT) | Emissions | |
| Improve pressure handling in GCHP advection | Yuanjian Zhang (WashU), Seb Eastham (ICL) | GCHP | |
| Add error trap for duplicate scale factors in HEMCO | Bob Yantosca (Harvard) | HEMCO | |
| Fix pressure handling in HEMCO standalone | Melissa Sulprizio (Harvard) | HEMCO | |
| Integration testing: Add stretched grid | Lizzie Lundgren (Harvard) | Quality Assurance | |
| Integration testing: Add GCAP2 | GCST | Quality Assurance | |
| Integration testing: Add GCHP mass flux run | Lizzie Lundgren (Harvard) | Quality Assurance | |
| Integration testing: Add run with all diagnostics turned on | GCST | Quality Assurance | |
| Integration testing: Reinstate TOMAS40 | Betty Croft (Dalhousie/WashU) | Quality Assurance | |
| Strat-adjusted RF in GCC and GCHP | Connor Barker, Eloise Marais (UCL) | Radiation | |
| Continue cleanup of C-preprocessor switches | Lizzie Lundgren (Harvard) | Structural | |
| updates to Luo deposition scheme | Gan Luo | Wet Deposition | |
| Testing the use of a new scavenging parameterization developed by Luo and Yu for cold cloud with Pb-210 aerosol tracer | Gan Luo (Albany), Fangqun Yu (Albany) | Wet Deposition |
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 and References |
|---|---|---|---|
| ML algorithms for bulk aerosol | Arshad Nair and Fangqun Yu (SUNY Albany) | Aerosols |
|
| Heterogeneous sulfate chemistry | Katie Travis | Chemistry | |
| H2 as an active species | Seb Eastham (IC) | Chemistry | |
| HCN, acetonitrile as fire tracers | Kevin Bates (CU Boulder) | Chemistry | |
| Implement ethane in carbon simulation | Yuzhong Zhang (Westlake) | Chemistry |
|
| VCPs emissions | Kelvin Bates (CU Boulder) | Emissions | |
| Mesospheric source of CO | Dylan Jones (UofT), Pam Wales (GSFC) | Emissions | |
| Drought-stress algorithm | Wei Li (U. Houston) | Emissions | |
| Physically-based resolution correction for BVOC emissions using MEGAN | May Fu (SUSTech) | Emissions | |
| Canadian forest fire prediction system (Canada government forecast model) | Robin (Montreal) | Emissions | |
| Furan emission factors (updates existing emissions) | Lu Hu/Lixu Jin (Montana) | Emissions | |
| Cooking emissions (not biofuel) | Kelvin Bates (CU Boulder) | Emissions | |
| State-specific annual emissions scaling factors (US) (1990-2021) | Ishir Dutta (MIT) | Emissions | |
| GISS-GC online | Lee Murray (Rochester) | External model |
|
| Hybrid MPI-OpenMP in GCHP | Seb Eastham (MIT); Killian Murphy (York); Lizzie Lundgren (Harvard) | GCHP |
|
| MAPL3: Update to MAPL3 in GCHP, including replacement of ExtData.rc and HISTORY.rc with YAML files | Lizzie Lundgren (Harvard) | GCHP | |
| MAPL3: Comply with MAPL "positive" standard in GCHP diagnostic files | Lizzie Lundgren (Harvard) | GCHP | |
| MAPL3: Wildcards in GCHP History | Lizzie Lundgren (Harvard) | GCHP | |
| MAPL3: Output emissions with positive up convention in GCHP | Lizzie Lundgren (Harvard) | GCHP | |
| Assessment/improvement of OpenMP performance in GC-Classic and HEMCO standalone | Bob Yantosca (Harvard) | Performance |
|
| Photophysical oxidation of aldehydes | Paulo Sebastianelli/Jenny Fisher (University of Wollongong) | Chemistry | |
| DMS updates | Will Porter (UCR) | Chemistry | |
| Furans emission and chemistry | Lixu Jin/Lu Hu(U Montana) | Chemistry + Emissions |
|
| Cl2 prodcution from Fe aerosol Qianjie Chen | (Hong Kong Poly)/Becky Alexander (UW) | Chemistry | |
| VCP, cooking: tracers species added i.e., D5, ethanol affecting PAN | Kevin Bates (CU Boulder) | Emissions | |
| bidirectional land-atmosphere exchange for Hg | Yuying Cui (MIT/Tsinghua) | Hg simulation | |
| OH covariances for inversions | Elise Penn (Harvard) | Inversions | |
| CESM2-GC offline | Seb Eastham (ICL); Lee Murray (Rochester) | Met fields | |
| Re-binning of off-line sea salt and dust for TOMAS | Betty Croft (Dalhousie) | Microphysics | |
| TOMAS nucleation updates | Sam O'Donnell (CSU) | Microphysics | |
| Stratospheric aerosol APM | Fangqun Yu (SUNY Albany) | Microphysics | |
| Transition from MERRA-2 to GEOS-IT for benchmarking | Yuanjian Zhang (WashU) | Quality Assurance | |
| Automate integration testing on AWS | Yidan Tang (WashU) | Quality Assurance | |
| Integration testing: Add across end of year run | GCST | Quality Assurance | |
| Integration testing: Add GEOS-IT | Yuanjian Zhang (WashU) | Quality Assurance | |
| Separate mixing, emissions, and drydep | Yuanjian Zhang (WashU) | Structural | |
| Intel IFX compiler | Bob Yantosca (Harvard) | Structural | |
| CMake option to only build libraries but not executable, also passing C-preprocessor statements to turn off code | Bob Yantosca (Harvard); Lee Murray (Rochester) | Structural | |
| Remove differences introduced when breaking up GC-Classic runs in time; and flexible precision in HEMCO | Lizzie Lundgren (Harvard) | Structural | |
| Limit allocation of State_Met to what is needed per simulation | Melissa Sulprizio (Harvard) | Structural |
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 and References |
|---|---|---|---|
| Modal aerosol model (MAM7) in GCHP | Shreya Sharma (MIT) | Aerosols | |
| Online OCIM ocean biogeochemistry | Lee Murray (Rochester); Hannah Horowitz (UIUC); Chris Holmes (FSU) | Chemistry | |
| Perchlorate chemistry | Yuk Chun Chan (UW) | Chemistry | |
| Non-stomatal dry deposition (2-layer canopy model) | Michael Vermeuel (Purdue) | Dry Deposition | |
| Continental chloride particle emissions (salty dust, road salt) | Jessica Haskins (Utah) | Emissions | |
| Multivolatility emission inventory to address gaps in EDGAR/HTAP etc. | Ruochong (Tshingua) | Emissions | |
| Lightning NOx production rates | Bex Horner (UCL) | Emissions | |
| HFO and CF3CHO | Beth Killen/Jenny Fisher (University of Wollongong) | Chemistry | |
| Glyoxal updates from isoprene | Tzung-May Fu (SUSTech) | Chemistry | |
| Iodine chemistry | Becky Alexander (UW)/Xuan Wang (cityU HK) | Chemistry | |
| Chlorine/Perchlorate | Yukchun Chan (UW) | Chemistry | |
| Playa dust chemistry to improve Cl over land | Jessica Haskins (Utah) | Chemistry | |
| GFED5 biomass burning | Eric Roy (MIT) | Emissions | |
| Ocean Hg surface concentrations for 2010-2020 from multi-model ensemble | Eric Roy (MIT)/Ari Feinberg (IQF-CSIC) | Hg simulation | |
| Soil Hg emissions 2010-2020 | Eric Roy (MIT)/Ari Feinberg (IQF-CSIC) | Hg simulation | |
| Air-sea exchange parameterization | Eric Roy (MIT) | Hg simulation | |
| Soil Hg emissions parameterization | Ari Feinberg (IQF-CSIC) | Hg simulation | |
| Sea salt uptake of GOM | Eric Roy (MIT) | Hg simulation | |
| Photoreduction rate constant | Eric Roy (MIT) | Hg simulation | |
| new observations (2010-2020) in standardized Hg benchmark for intercomparison | Eric Roy (MIT)/Ari Feinberg (IQF-CSIC) | Hg simulation | |
| Hg simulation in GCHP | Eric Roy (MIT) | Hg simulation | |
| OCIM - biogeochemical model - (C/P/N/Fe - no Hg yet) (MATLAB) | Hannah Horowitz (UIUC) | Hg simulation | |
| possibly updating Hg oxidation chemistry based on Utah field campaigns | Jessica Haskins (Utah) | Hg simulation | |
| New halogen/aerosol fields (surface area / AOD) from 10-year 14.4 benchmark simulation available online | Viral Shah (NASA GMAO); Eric Roy (MIT); Ari Feinberg (IQF-CSIC) | Input data | |
| Extend IMI to CO2 (ICI) | Hannah Nesser (JPL) | Inversions | |
| Global emission inventory of metals | Tzung-May Fu (SUSTech); He Zhong Tian (Peking Normal U) | Metals simulation | |
| Investigate and improve performance of aerosol chemistry | Bob Yantosca (Harvard) | Performance | |
| PAH - update from version 11 | Lexia Cicone (MIT) | POPs simulation | |
| Species database more accessible; doc updates; TOL discussion | Jessica Haskins (Utah) | Structural | |
| Stretched-grid plotting in GCPy | Killian Murphy (York) | Tools | |
| Model inter-comparison of transport (GEOS, GCHP, GCClassic) | Lizzie Lundgren (Harvard), Emma Knowland (NASA) | Transport | |
| Comparing mass fluxes in GCHP vs. traditional lat/lon wind | Yuanjian Zhang (WashU), Seb Eastham (ICL) | Transport |