Atmospheric Lifetimes of Long-Lived Halogenated Species

  title={Atmospheric Lifetimes of Long-Lived Halogenated Species},
  author={Akkihebbal R. Ravishankara and Stanley C. Solomon and Andrew A. Turnipseed and Rachel F. Warren},
  pages={194 - 199}
The atmospheric lifetimes of the fluorinated gases CF4, C2F6, c-C4F8, (CF3)2c-C4F6, C5F12, C6F14, C2F5Cl, C2F4C12, CF3Cl, and SF6 are of concern because of the effects that these long-lived compounds acting as greenhouse gases can have on global climate. The possible atmospheric loss processes of these gases were assessed by determining the rate coefficients for the reactions of these gases with O(1D), H, and OH and the absorption cross sections at 121.6 nanometers in the laboratory and using… 
Effects of electron and ion reactions on atmospheric lifetimes of fully fluorinated compounds
Atmospheric lifetimes are evaluated for the fully fluorinated compounds CF4, C2F6, c-C4F8, C6F14, and SF6 using a two-dimensional transport and chemistry model which includes removal by electrons and
Mesospheric removal of very long-lived greenhouse gases SF6 and CFC-115 by metal reactions, Lyman-α photolysis, and electron attachment.
Quant chemistry calculations of the potential energy surfaces for the SF6 reactions indicate that the Na and K reactions with SF6 are probably activated by vibrational excitation of the F-SF5 (v3) stretching mode, and atmospheric removal by a variety of processes is evaluated.
Atmospheric degradation and global warming potentials of three perfluoroalkenes
The vapour phase reactions of perfluoropropene, CF3aCF1⁄4CF2, and perfluorobuta-1,3-diene, CF21⁄4CFaCF1⁄4CF2, with OH, NO3 and O3 were studied at 29874K and 74075Torr using long-path FT-IR detection.
Atmospheric histories and emissions of chlorofluorocarbons CFC-13 (CClF3), 6CFC-114 (C2Cl2F4), and CFC-115 (C2ClF5)
Based on observations of the chlorofluorocarbons CFC-13 (chlorotrifluoromethane), 6CFC-114 (combined measurement of both isomers of dichlorotetrafluoroethane), and CFC-115 (chloropentafluoroethane)
Atmospheric sulfur hexafluoride: Sources, sinks and greenhouse warming
Model calculations using estimated reaction rates of sulfur hexafluoride (SF6) with OH and O(1D) indicate that the atmospheric lifetime due to these processes may be very long (25,000 years). An
Perfluorotributylamine: A novel long‐lived greenhouse gas
Perfluorinated compounds impact the Earth's radiative balance. Perfluorotributylamine (PFTBA) belongs to the perfluoroalkyl amine class of compounds; these have not yet been investigated as
Growth of fluoroform (CHF3, HFC‐23) in the background atmosphere
There is growing concern over the emission and accumulation of very long‐lived fluorinated trace gases in the atmosphere, due to their large global warming potentials (GWPs). Unlike CFCs and other
Long - term tropospheric trend of octafluorocyclobutane (c-C4F8 or PFC-318)
Abstract. Air samples collected at Cape Grim, Tasmania between 1978 and 2008 and during a series of more recent aircraft sampling programmes have been analysed to determine the atmospheric abundance
Atmospheric histories and emissions of chlorofluorocarbons CFC-13 (CClF 3 ), ΣCFC-114 (C 2 Cl 2 F 4 ), and CFC-115 (C 2 ClF 5 )
Abstract. Based on observations of the chlorofluorocarbons CFC-13 (chlorotrifluoromethane), ΣCFC-114 (combined measurement of both isomers of dichlorotetrafluoroethane), and CFC-115
Determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model
Abstract. We have used the Whole Atmosphere Community Climate Model (WACCM), with an updated treatment of loss processes, to determine the atmospheric lifetime of sulfur hexafluoride (SF6). The model


Atmospheric Carbon Tetrafluoride: A Nearly Inert Gas
An analysis of existing thermodynamic, photochemical, and kinetic data indicates that the dominant sinks for atmospheric carbon tetrafluoride (CF4) are in and above the mesosphere. Theoretical
CF4 and C2F6 in the atmosphere
Mid-latitude vertical profiles of CF4 and C2F6 are presented. They show CF4 decreasing from about 67 parts per trillion by volume (pptv) in the troposphere to 60 pptv at 35 km, while C2F6 falls off
Atmospheric carbontetrafluoride (CF4): Sources and trends
Concentrations of carbontetrafluoride (CF4) observed at the south pole suggest that this inert trace gas is accumulating in the earth's atmosphere at about 1.3 (0.8-2) pptv/yr. This amounts to an
Vacuum ultraviolet and photoelectron spectra of fluoro‐chloro derivatives of methane
The photoelectron and vacuum ultraviolet absorption spectra (200–120 nm) of CF3Cl, CF3Br, CF2HCl, CFH2Cl, CFHCl2, CF2Cl2, and CFCl3 are reported and discussed. The lowest ionization potentials belong
Infrared spectroscopic detection of sulfur hexafluoride (sf6) in the lower stratosphere and upper troposphere
Absorption by sulfur hexafluoride (SF6) has been detected in high-resolution infrared solar spectra of the lower stratosphere and upper troposphere. The identification is based on measurements of the
Photodissociation of H2O2 and CH3OOH at 248 nm and 298 K: Quantum yields for OH, O(3P) and H(2S)
The quantum yields of the products, OH(X 2Π), O(3P) [plus O(1D)] and H(2S), in the photolysis of H2O2 and CH3OOH at 248 nm and 298 K have been measured. OH was directly observed by laser‐induced
Vacuum ultraviolet and photoelectron spectra of fluoroethanes
The photoelectron and vacuum ultraviolet absorption spectra of ethylfluoride, 1,1‐difluoroethane, 1,1,1‐trifluoroethane, and hexafluoroethane have been measured up to 20 eV. The photoelectron spectra
Reaction of hydrogen atom with benzene. Kinetics and mechanism
The rate coefficients for the reactions H + C/sub 6/H/sub 6/ ..-->.. products (k/sub 1/) (1), H + C/sub 6/D/sub 6/ ..-->.. products (k/sub 2/) (2), D + C/sub 6/H/sub 6/ ..-->.. products (k/sub 3/)