ECV Products and Requirements for Carbon Dioxide, Methane & Other Greenhouse Gases
These products and requirements reflect the Implementation Plan 2016 (GCOS-200). GCOS is reviewing and will update the requirements until 2022. More information on: gcos.wmo.int.
| PRODUCT | DEFINITION | FREQUENCY | RESOLUTION | REQUIRED MEASUREMENT UNCERTAINTY | STABILITY | STANDARDS/ REFERENCES |
| Tropospheric CO2 column | Molecules of CO2 in the atmosphere from surface to Tropopause (Molecules/cm2) | 4hr | 5-10km/NA | 1ppm | 1.5ppm/ decade | ESA CCI CMUG tables (http://www.esa-cmug-cci.org/) |
| Tropospheric CO2 | Dry air mole fraction of CO2 in the troposphere (Mol/mol) | 4hr | 5-10km/5km | 1ppm | 1.5ppm | |
| Tropospheric CH4 column | Total molecules of CH4 in the atmosphere from surface to Tropopause (Molecules/cm2) | 4hr | 5-10km/NA | 10ppb | 7ppb | |
| Tropospheric CH4 | Dry air mole fraction of CH4 in the troposphere (Mol/mol) | 4hr | 5-10km/5km | 0.5ppb | 0.7ppb | |
| Stratospheric CH4 | Dry air mole fraction of CH4 in the stratosphere (Mol/mol) | daily | 100-200km/2km | 5% | 0.30% |
