ECV Products and Requirements for Precursors for Aerosols and Ozone
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 | FREQ. | RES. | REQUIRED MEASUREMENT UNCERTAINTY | STABILITY | STANDARDS/ REFERENCES |
| NO2 tropospheric column | Molecules of NO2 in the atmosphere from surface to tropopause (Molecules/cm2) | 4hr | 5-10 km/NA | Max (20%,0.03DU) | 2% | |
| SO2,HCHO tropospheric columns | Total molecules of SO2, HCHO in the atmosphere from surface to tropopause (Molecules/cm2) | 4hr | 5-10 km/NA | Max (30%,0.04DU) | 5% | |
| CO tropospheric column | Total molecules of CO in the atmosphere from surface to tropopause (Molecules/cm2) | 4hr | 5-10 km/NA | Max (20%,20DU); | 2% | |
| CO tropospheric profile | Dry air mole fraction of CO (Mol/mol) | 4hr | 10 km/5km | 20%; | 2% |
