A measurement of the greenhouse radiation associated with CCl4

Wayne F. J. Evans; Chris J. Ferguson; Eldon Puckrin

doi:10.1117/12.570452

14 December 2004 A measurement of the greenhouse radiation associated with CCl₄

Wayne F. J. Evans, Chris J. Ferguson, Eldon Puckrin

Proceedings Volume 5584, Chemical and Biological Standoff Detection II; (2004) https://doi.org/10.1117/12.570452
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

One of the gases which potentially can interfere with the remote sensing of gases of military interest is carbon tetrachloride (CCL₄). Carbon tetrachloride is also a strong greenhouse gas with a global warming potential of 4,000. Ground-based, thermal emission measurements of the cold, clear sky have been made showing the v₃ fundamental emission band of carbon tetrachloride (CCL₄) which is located in the 786-806 cm^-1 region. A spectrum of the non-CCl₄ background emission features has been simulated using the FASCD3P line-by-line radiation code with measured radiosonde parameters of pressure, temperature and humidity. The simulated spectrum has been used to extract the CCl₄ thermal emission band from the atmospheric emission spectrum. Troposhperic CCl₄ mixing ratios of 120±20 in 1995 and 135±10 pptv in 2003 were determined from these measurements. In addition, the downward long-wave flux associated with the v₃ emission band of CCl₄ measured at the surface has been estimated to be 0.046 W/m² ± 17%. This flux is about one third and one fifth of that corresponding to the chlorofluorocarbons CFC-11 and CFC-12, respectively.

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Wayne F. J. Evans, Chris J. Ferguson, and Eldon Puckrin "A measurement of the greenhouse radiation associated with CCl₄", Proc. SPIE 5584, Chemical and Biological Standoff Detection II, (14 December 2004); https://doi.org/10.1117/12.570452

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