22 May 1997 Monitoring cloud parameters using a ground-based FTIR system
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Abstract
A method for the evaluation of cloud temperature and transmittance from ground-based measurements of the downwelling spectral radiance is proposed. The method uses the strong emission band of ozone at 9.6 micrometers as a natural source of IR radiation for probing clouds. Temperature and transmittance are derived from the cloudy sky radiance measured in two narrow spectral channels. Cloud parameters are found by solving a system of equations requiring an estimate of the cloud height and thickness obtained from lidar returns and of atmospheric temperature and humidity profiles. Tests performed on experimental spectra verify the method with typical temperature errors smaller than 2 K for the spectral measurements coincident in time with the lidar measurements. The main sources of limitation are identified and analyzed.
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Jean-Marc Theriault, Jean-Marc Theriault, Luc R. Bissonnette, Luc R. Bissonnette, Gilles Roy, Gilles Roy, } "Monitoring cloud parameters using a ground-based FTIR system", Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); doi: 10.1117/12.274718; https://doi.org/10.1117/12.274718
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