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Ozone Radiometer at 142 GHz: Calibration

Yasmine Calisesi. Ozone Radiometer at 142 GHz: Calibration. The Stratospheric Ozone Monitoring Radiometer SOMORA. Developed by the IAP for MeteoSwiss Tuned to Ozone at 142.175 GHz Improved version of the GROMOS instrument Operated at the IAP since January 2000 Moved to Payerne in June 2002.

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Ozone Radiometer at 142 GHz: Calibration

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  1. Yasmine Calisesi Ozone Radiometer at 142 GHz:Calibration

  2. The Stratospheric Ozone Monitoring Radiometer SOMORA • Developed by the IAP for MeteoSwiss • Tuned to Ozone at 142.175 GHz • Improved version of the GROMOS instrument • Operated at the IAP since January 2000 • Moved to Payerne in June 2002

  3. Somora location in Payerne

  4. IF 7.1 Ghz Rotating Planar Mirror Eccosorb CV-3 Hot Load T = 310 K Cold Load T=77K SOMORA Quasi-Optics

  5. Heating Element Fans PT 100 Eccosorb CV-3 PT 100 Polystyrene Window SOMORA Hot Load

  6. Eccosorb CV-3 SOMORA Cold Load Packaging Foam Material Dewar Vessel

  7. Expansion Vessel P = 0.4 Bar Liquid N2 Inlet Gaz-phase N2 exhaust

  8. Total Power Calibration

  9. In the RJ limit (hn << kT):  P ÷ T  P can be replaced by T in RT model Temperature Definitions • Physical Temperature • „Planck“ Brightness Temp.:

  10. Example: Planck and RJ emission curves at various frequencies Brightness Temperature [K]

  11. Conclusions: • SOMORA: Total power radiometer • P÷Tin considered T rangeTotal power calibration formula can be used • TRJ≠TPRadiative transfer computed in the units ofP

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