An observation of the atmopsheric thermal emission spectrum of trichlorofluoromethane (CFC-11)

Physics

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Airglow, Atmospheric Moisture, Emission Spectra, Fluoro Compounds, Greenhouse Effect, Methane, Thermal Emission, Algorithms, Radiance, Spectrometers, Zenith

Scientific paper

Ground-based measurements of the thermal emission from the clear zenith sky have been made which clearly show the nu(sub 4) band of CFC-11 (or CCl3F). An atmospheric water spectrum has been derived from these measurements and used to subtract the water emission features from the thermal emission spectra. These observations have been compared to line-by-line atmospheric radiance calculations using the FASCD3P algorithm. The agreement of the atmospheric CFC-11 emission band between the simulated result and the observed water-subtracted result is good. From these measurements the total downward greenhouse flux from the CFC-11 nu(sub 4) emission band has been found to be 0.25 W/sq m +/- 10%.

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