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GCOS Atmosphere Composition ECV - Ozone

Ozone (O3) is a short-lived greenhouse gas whose changes since the pre-industrial era due to emissions of precursor species contribute to a tropospheric radiative forcing that is larger than that of N2O, but less than that of CH4. Ozone is a harmful pollutant when present near the Earth’s surface. Ozone is also the most important radiatively active trace gas in the stratosphere and essentially determines the vertical temperature profile there. Ozone limits the amount of harmful UV radiation reaching the Earth’s surface. Chemical depletion of stratospheric ozone, and ozone chemistry more generally from the surface to the mesosphere, are influenced by atmospheric temperature, by several of the species covered by the atmospheric-composition ECVs and by polar stratospheric clouds. Ozone is influenced by atmospheric dynamics, but in turn influences dynamics via radiative heating. Chemical depletion caused low springtime values of ozone to develop increasingly in the 1980s and 1990s over or near the South Pole (forming the so-called ozone hole).

Product requirements

  • Total column ozone:
    • Frequency: 4hr
    • Resolution: 20-50km/NA
    • Required Measurement uncertainty: Max(2%;5DU)
    • Stability (per decade unless otherwise specified): 1%
    • Entity (Satellite): WGClimate
  • Troposphere Ozone:
    • Frequency: 4hr
    • Resolution: 20-50km/5km
    • Required Measurement uncertainty: 10-15%
    • Stability (per decade unless otherwise specified): 2%
    • Entity (Satellite): WGClimate
    • Entity (in situ): GAW
  • Ozone profile in upper and lower stratosphere:
    • Frequency: 4hr
    • Resolution: 100-200km/1-2km
    • Required Measurement uncertainty: 10%
    • Stability (per decade unless otherwise specified): 2%
    • Entity (Satellite): WGClimate
  • Ozone profile in upper strato-and mesosphere:
    • Frequency: daily
    • Resolution: 100-200km/3km/
    • Required Measurement uncertainty: 5-20%
    • Stability (per decade unless otherwise specified): 2%
    • Entity (Satellite): WGClimate

Contributing networks:

Data sources: