FastFind »   Lastname: doi:10.1029/ Year: | Advanced Search  

AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Middle atmosphere—constituent transport and chemistry
  • Global Change: Atmosphere
  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1712, 4 PP., 2002
doi:10.1029/2002GL015356

Atmospheric lifetime of SF5CF3

K. Takahashi

Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Japan

T. Nakayama

Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Japan

Y. Matsumi

Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Japan

S. Solomon

National Oceanic and Atmospheric Administration, USA

T. Gejo

Institute for Molecular Science, Japan

E. Shigemasa

Institute for Molecular Science, Japan

T. J. Wallington

Ford Research Laboratory, USA

The vacuum ultraviolet (VUV) absorption spectrum of SF5CF3 was measured over the range 106–200 nm. At 121.6 nm, σ(base e) = (7.8 ± 0.6) × 10−18 cm2 molecule−1, in which quoted uncertainty includes two standard deviation from the least-square fit in the Beer-Lambert plot and our estimate of potential systematic errors associated with measurements of the reactant concentrations. The VUV spectrum and literature data for electron attachment and ion-molecule reactions were incorporated into a model of the stratosphere, mesosphere, and lower thermosphere. This information provides better constraints on the atmospheric lifetime and hence on the potential of this highly radiatively-active trace gas to influence the climate system. The atmospheric lifetime of SF5CF3 is dominated by dissociative electron attachment and is estimated to be approximately 950 years. Solar proton events could reduce this to a lower limit of 650 years.

Published 1 August 2002.

Citation: Takahashi, K., T. Nakayama, Y. Matsumi, S. Solomon, T. Gejo, E. Shigemasa, and T. J. Wallington (2002), Atmospheric lifetime of SF5CF3, Geophys. Res. Lett., 29(15), 1712, doi:10.1029/2002GL015356.

Cited By

Please wait one moment ...