Next Article in Journal
A Comparative Study of B-, Γ- and Log-Normal Distributions in a Three-Moment Parameterization for Drop Sedimentation
Previous Article in Journal
Performance of Using Cascade Forward Back Propagation Neural Networks for Estimating Rain Parameters with Rain Drop Size Distribution
Open AccessArticle

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

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.
Atmosphere 2014, 5(3), 473-483; https://doi.org/10.3390/atmos5030473
Received: 13 May 2014 / Revised: 12 June 2014 / Accepted: 24 June 2014 / Published: 17 July 2014
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. View Full-Text
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)
Show Figures

Figure 1

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

1
Only visits after 24 November 2015 are recorded.
Back to TopTop