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GCOS Atmosphere Composition ECV - Precursors (supporting the Aerosol and Ozone ECVs)

Precursor species include nitrogen dioxide (NO2), SO2, CO and formaldehyde (HCHO). Surface atmospheric concentrations of NO2 and SO2 may reach levels that are directly harmful to health and lead to detrimental environmental impacts through acid rain, although emission controls have lowered concentrations over time in many regions.

Product requirements:

  • NO2 tropospheric column:
    • Frequency: 4hr
    • Resolution: 5-10km/NA
    • Required Measurement uncertainty: Max(20%,0.03DU)
    • Stability (per decade unless otherwise specified): 2%
    • Entity (Satellite): WGClimate
  • SO2,HCHO tropospheric columns:
    • Frequency: 4hr
    • Resolution: 5-10km/NA
    • Required Measurement uncertainty: Max(30%,0.04DU)
    • Stability (per decade unless otherwise specified): 5%
    • Entity (Satellite): WGClimate
  • CO tropospheric column:
    • Frequency: 4hr
    • Resolution: 5-10km/NA
    • Required Measurement uncertainty: Max(20%,20DU)
    • Stability (per decade unless otherwise specified): 2%
    • Entity (Satellite): WGClimate
  • CO tropospheric profile:
    • Frequency: 4hr
    • Resolution: 10km/5km
    • Required Measurement uncertainty: 20%
    • Stability (per decade unless otherwise specified): 2%
    • Entity (Satellite): WGClimate

Contributing Networks:

Data Sources: