determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model
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2017
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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 includes the following SF6
removal processes: photolysis, electron attachment and reaction with
mesospheric metal atoms. The Sodankylä Ion Chemistry (SIC) model is
incorporated into the standard version of WACCM to produce a new version
with a detailed D region ion chemistry with cluster ions and
negative ions. This is used to determine a latitude- and altitude-dependent
scaling factor for the electron density in the standard WACCM in order to
carry out multi-year SF6 simulations. The model gives a mean SF6
lifetime over an 11-year solar cycle (τ) of 1278 years (with a
range from 1120 to 1475 years), which is much shorter than the currently
widely used value of 3200 years, due to the larger contribution (97.4 %)
of the modelled electron density to the total atmospheric loss. The loss of
SF6 by reaction with mesospheric metal atoms (Na and K) is far too slow
to affect the lifetime. We investigate how this shorter atmospheric lifetime
impacts the use of SF6 to derive stratospheric age of air. The
age of air derived from this shorter lifetime SF6 tracer is longer by
9 % in polar latitudes at 20 km compared to a passive SF6 tracer. We
also present laboratory measurements of the infrared spectrum of SF6
and find good agreement with previous studies. We calculate the resulting
radiative forcings and efficiencies to be, on average, very similar to those
reported previously. Our values for the 20-, 100- and 500-year global warming
potentials are 18 000, 23 800 and 31 300, respectively.
| Reference Key |
kovcs2017atmosphericdetermination
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|---|---|
| Authors | ;T. Kovács;W. Feng;A. Totterdill;J. M. C. Plane;S. Dhomse;J. C. Gómez-Martín;G. P. Stiller;F. J. Haenel;C. Smith;P. M. Forster;R. R. García;D. R. Marsh;M. P. Chipperfield |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-883-2017
|
| URL | |
| Keywords |
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