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

Etminan, Maryam, Highwood, Eleanor, Laube, Johannes, McPheat, Robert, Marston, George, Shine, Keith and Smith, Kevin (2014) Infrared Absorption Spectra, Radiative Efficiencies, and Global Warming Potentials of Newly-Detected Halogenated Compounds: CFC-113a, CFC-112 and HCFC-133a. Atmosphere, 5 (3). pp. 473-483. ISSN 2073-4433

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Official URL: http://dx.doi.org/10.3390/atmos5030473

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.

Item Type: Article
Uncontrolled Keywords: chlorofluorocarbons; hydrochlorofluorocarbons; absorption cross-section; absorption intensity; radiative efficiency; global warming potential (GWP)
Subjects: F100 Chemistry
F800 Physical and Terrestrial Geographical and Environmental Sciences
Depositing User: Becky Skoyles
Date Deposited: 15 Nov 2018 11:53
Last Modified: 11 Dec 2018 09:00
URI: http://nrl.northumbria.ac.uk/id/eprint/36705

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