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Proceedings Paper

Monitoring cloud parameters using a ground-based FTIR system
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Paper 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.

Paper Details

Date Published: 22 May 1997
PDF: 10 pages
Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); doi: 10.1117/12.274718
Show Author Affiliations
Jean-Marc Theriault, Defence Research Establishment Valcartier (Canada)
Luc R. Bissonnette, Defence Research Establishment Valcartier (Canada)
Gilles Roy, Defence Research Establishment Valcartier (Canada)

Published in SPIE Proceedings Vol. 3106:
Spectroscopic Atmospheric Monitoring Techniques
Klaus Schaefer, Editor(s)

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