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Atmosphere 2014, 5(3), 473-483; doi:10.3390/atmos5030473
Article

Infrared Absorption Spectra, Radiative Efficiencies, and Global Warming Potentials of Newly-Detected Halogenated Compounds: CFC-113a, CFC-112 and HCFC-133a

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1 Department of Meteorology, University of Reading, Reading RG6 6BB, UK 2 School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK 3 RAL Space Department, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK 4 Department of Chemistry, University of Reading, Reading RG6 6AD, UK
* Author to whom correspondence should be addressed.
Received: 13 May 2014 / Revised: 12 June 2014 / Accepted: 24 June 2014 / Published: 17 July 2014
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Abstract

CFC-113a (CF3CCl3), CFC-112 (CFCl2CFCl2) and HCFC-133a (CF3CH2Cl) are three newly detected molecules in the atmosphere that are almost certainly emitted as a result of human activity. It is important to characterise the possible contribution of these gases to radiative forcing of climate change and also to provide information on the CO2-equivalence of their emissions. We report new laboratory measurements of absorption cross-sections of these three compounds at a resolution of 0.01 cm−1 for two temperatures 250 K and 295 K in the spectral range of 600–1730 cm−1. These spectra are then used to calculate the radiative efficiencies and global warming potentials (GWP). The radiative efficiencies are found to be between 0.15 and 0.3 W∙m−2∙ppbv−1. The GWP for a 100 year time horizon, relative to carbon dioxide, ranges from 340 for the relatively short-lived HCFC-133a to 3840 for the longer-lived CFC-112. At current (2012) concentrations, these gases make a trivial contribution to total radiative forcing; however, the concentrations of CFC-113a and HCFC-133a are continuing to increase. The 2012 CO2-equivalent emissions, using the GWP (100), are estimated to be about 4% of the current global CO2-equivalent emissions of HFC-134a.
Keywords: chlorofluorocarbons; hydrochlorofluorocarbons; absorption cross-section; absorption intensity; radiative efficiency; global warming potential (GWP) chlorofluorocarbons; hydrochlorofluorocarbons; absorption cross-section; absorption intensity; radiative efficiency; global warming potential (GWP)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Etminan, M.; Highwood, E.J.; Laube, J.C.; McPheat, R.; Marston, G.; Shine, K.P.; Smith, K.M. Infrared Absorption Spectra, Radiative Efficiencies, and Global Warming Potentials of Newly-Detected Halogenated Compounds: CFC-113a, CFC-112 and HCFC-133a. Atmosphere 2014, 5, 473-483.

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