| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Atmosphere >
Trace gases (excluding ozone) >
CFC-11 (column/profile)
  | Measurement Definition*: CFC-11 = Trichlorofluoromethane = Freon-11. Requested from surface to TOA (layers: LT, HT, LS, HS&M) - Physical unit: [ ppm ] - Accuracy unit: [ % ]. |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
ACE-FTS
Atmospheric Chemistry Experiment (ACE) Fourier Transform Spectrometer | Operational
| Measure and understand the chemical processes that control the distribution of ozone in the Earth's atmosphere, especially at high altitudes. | n/a | |
HiRDLS
High Resolution Dynamics Limb Sounder | No longer operational
| Measures atmospheric temperature, concentrations of ozone, water vapour, methane, NOx, N2O, CFCs and other minor species, aerosol concentration, location of polar stratospheric clouds and cloud tops. Currently not collecting data on Aqua. | n/a | |
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* Description adapted from WMO.
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