Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 16, 8043-8052, 2016
https://doi.org/10.5194/acp-16-8043-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Jul 2016
UV and infrared absorption spectra, atmospheric lifetimes, and ozone depletion and global warming potentials for CCl2FCCl2F (CFC-112), CCl3CClF2 (CFC-112a), CCl3CF3 (CFC-113a), and CCl2FCF3 (CFC-114a)
Maxine E. Davis1,2,3, François Bernard1,2, Max R. McGillen1,2, Eric L. Fleming4,5, and James B. Burkholder1 1Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA
2Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
3Michigan State University, Lyman Briggs College, East Lansing, Michigan, USA
4NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
5Science Systems and Applications, Inc., Lanham, Maryland, USA
Abstract. The potential impact of CCl2FCF3 (CFC-114a) and the recently observed CCl2FCCl2F (CFC-112), CCl3CClF2 (CFC-112a), and CCl3CF3 (CFC-113a) chlorofluorocarbons (CFCs) on stratospheric ozone and climate is presently not well characterized. In this study, the UV absorption spectra of these CFCs were measured between 192.5 and 235 nm over the temperature range 207–323 K. Precise parameterizations of the UV absorption spectra are presented. A 2-D atmospheric model was used to evaluate the CFC atmospheric loss processes, lifetimes, ozone depletion potentials (ODPs), and the associated uncertainty ranges in these metrics due to the kinetic and photochemical uncertainty. The CFCs are primarily removed in the stratosphere by short-wavelength UV photolysis with calculated global annually averaged steady-state lifetimes (years) of 63.6 (61.9–64.7), 51.5 (50.0–52.6), 55.4 (54.3–56.3), and 105.3 (102.9–107.4) for CFC-112, CFC-112a, CFC-113a, and CFC-114a, respectively. The range of lifetimes given in parentheses is due to the 2σ uncertainty in the UV absorption spectra and O(1D) rate coefficients included in the model calculations. The 2-D model was also used to calculate the CFC ozone depletion potentials (ODPs) with values of 0.98, 0.86, 0.73, and 0.72 obtained for CFC-112, CFC-112a, CFC-113a, and CFC-114a, respectively. Using the infrared absorption spectra and lifetimes determined in this work, the CFC global warming potentials (GWPs) were estimated to be 4260 (CFC-112), 3330 (CFC-112a), 3650 (CFC-113a), and 6510 (CFC-114a) for the 100-year time horizon.

Citation: Davis, M. E., Bernard, F., McGillen, M. R., Fleming, E. L., and Burkholder, J. B.: UV and infrared absorption spectra, atmospheric lifetimes, and ozone depletion and global warming potentials for CCl2FCCl2F (CFC-112), CCl3CClF2 (CFC-112a), CCl3CF3 (CFC-113a), and CCl2FCF3 (CFC-114a), Atmos. Chem. Phys., 16, 8043-8052, https://doi.org/10.5194/acp-16-8043-2016, 2016.
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Short summary
Chlorofluorocarbons, CFCs, are man-made compounds emitted into the atmosphere. Recently, several CFC compounds (CCl2FCCl2F (CFC-112), CCl3CClF2 (CFC-112a), CCl3CF3 (CFC-113a)) were observed in the atmosphere for the first time while their impact on stratospheric ozone and climate is presently not well characterized. In this study, the UV absorption spectra of these CFCs and CCl2FCF3 (CFC-114a) were measured, and an atmospheric model was used to evaluate their impacts on ozone and climate.
Chlorofluorocarbons, CFCs, are man-made compounds emitted into the atmosphere. Recently,...
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