We also maintain a list of current model development plans on the CCWG website: https://www.cesm.ucar.edu/working-groups/chemistry/development-plans
Awaiting merging
These model updates are available in some development branches and are awaiting full merging in the trunk.
| Feature Update | Component | Relevant model | Contibutor(s) | Notes |
|---|---|---|---|---|
| New dust scheme | land and atmosphere: interactive emissions | CESM/CAM-Chem, WACCM and MUSICA | Danny Leung | An updated interactive dust scheme to emit dust into the atmopshere. Will be default in CESM3. (CAM Issue #651) |
| MAM5 aerosols | aerosol mechanism | CESM/CAM-Chem, WACCM and MUSICA | Simone Tilmes, Louisa Emmons, Francis Vitt, Mike Mills | MAM5 (MAM4 + 1 mode for stratospheric sulfate) for all CESM configuration (CAM Issue #663, #664) |
| Soil NOx | Updated Soil NOx emissions (CTSM Issue #1952) |
Top priority for integration
The list below identifies model updates priorities, that are necessary to improve atmospheric chemistry modeling.
| Feature Update | Component | Relevant model | Contibutor(s) | Notes |
|---|---|---|---|---|
| CMIP7 Forcing | Emissions and external forcing | CESM/CAM-Chem | Benjamin Gaubert, Simone Tilmes, Louisa Emmons, Rebecca Buchholz | https://github.com/NCAR/CMIP7_inputdata_processing |
| TUVx | Photolysis | CESM/CAM-Chem, WACCM and MUSICA | Doug Kinnison | New photolysis scheme. (https://github.com/NCAR/tuv-x) |
| MEGAN v3 | land and atmosphere: interactive emissions | CESM/CAM-Chem, WACCM and MUSICA | Alex Guenther | Implement updated interactive biogenic emissions with Model of Emissions of Gases and Aerosols from Nature (MEGAN) version 3 (CTSM Issue #1323) |
| Nitrate aerosols | aerosol mechanism | CESM/CAM-Chem, WACCM and MUSICA | Danny Leung, Yunqian Zhu | Implementation of MOSIAC and CARMA with nitrate aerosols. |
Long-term plans
These updates are on our radar, but either are low priority or do not have anyone assigned to work on them.
| Feature Update | Component | Relevant model | Notes |
|---|---|---|---|
| Saving 2m ozone | diagnostic | CESM/CAM-Chem, WACCM and MUSICA | Some land component output is necessary for interpolating the surface layer to 2m. Forrest Lacey has performed this previously with MUSICA output. |
| Saving MDA8 ozone | diagnostic | CESM/CAM-Chem, WACCM and MUSICA | Important for comparing with air quality attainment standards. |
| Lightning NOx | atmosphere interactive emissions | CESM/CAM-Chem, WACCM and MUSICA | Scale aware production of lightning NOx. |
| Upper boundary conditions | External forcing | Optional Upper boundary conditions for the low top L58 model created from a WACCM simulation (CAM Issue #533). | |
| Marine Organic Aerosol Emissions | emissions | CESM/CAM-Chem, WACCM and MUSICA | Add emissions of marine aerosols (CAM Issue #531). |
Previous updates
Previous updates that have happened in the model.
| Feature Update | Component | Relevant model | Contibutor(s) | Notes | Date Finalized |
|---|---|---|---|---|---|
| T4S Chemistry Mechanism | chemistry mechanism | CESM/CAM-Chem, WACCM and MUSICA | Louisa Emmons | Simplified tropospheric and stratospheric chemistry to be used for longer scale runs (e.g. CMIP7). | |
| T3S | chemistry mechanism | ||||
| HEMCO integration | emissions | Haipeng Lin | Online reading and re-gridding of emissions. (CAM Issue #560) | ||
| Simple Chemistry | chemistry mechanism | CAM7 | Duseong Jo, Louisa Emmons | Simple chemistry (for CAM7) with updated SOA parameterization to support tropospheric aerosol formation (MAM4) (CAM Issue #727) | |
| OASSIS | interactive emissions | CESM/CAM-Chem, WACCM and MUSICA | Siyuan Wang | Online DMS emissions based on Online Air-Sea Interface for Soluble Species (OASISS) |