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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 9
Ann. Geophys., 13, 969–972, 1995
© European Geosciences Union 1995
Ann. Geophys., 13, 969–972, 1995
© European Geosciences Union 1995

  30 Sep 1995

30 Sep 1995

The measurement and extraction of the Nu6 atmospheric emission band of CFC-12 from interfering emission features

W. F. J. Evans and E. Puckrin W. F. J. Evans and E. Puckrin

Abstract. Ground-based thermal emission measurements of the zenith sky have been made at Peterborough, Ontario since January 1993. In this paper, the measurement of the Nu6 band of atmospheric CFC-12, an important greenhouse gas, is presented for a cold, clear day in January 1994. A spectrum of the non-CFC-12 emission features has been simulated using the FASCD3P radiation code and measured radiosonde profiles of temperature, pressure and humidity. This has enabled a satisfactory subtraction of the interfering emission features from the CFC-12 emission spectrum. A comparison of the observed and simulated Nu6-bands of CFC-12 shows good agreement at all frequencies of emission. From these spectra the total downward greenhouse radiative flux from the CFC-12 Nu6 emission based for a very cold day has been estimated to be 0.27 W m–2±10%.

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