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

Atmosphere

Maryam Etminan¹  Eleanor J. Highwood¹  Johannes C. Laube²  Robert McPheat⁴  George Marston³  Keith P. Shine¹ 

[1] Department of Meteorology, University of Reading, Reading RG6 6BB, UK; E-Mails:;School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK; E-Mail:;Department of Chemistry, University of Reading, Reading RG6 6AD, UK; E-Mail:;RAL Space Department, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK; E-Mails:

关键词: chlorofluorocarbons;    hydrochlorofluorocarbons;    absorption cross-section;    absorption intensity;    radiative efficiency;    global warming potential (GWP);   

DOI  :  10.3390/atmos5030473

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.