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A three-dimensional model study of the effect of new temperature-dependent quantum yields for acetone
 

Summary: A three-dimensional model study of the effect of new
temperature-dependent quantum yields for acetone
photolysis
S. R. Arnold and M. P. Chipperfield
Institute for Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK
M. A. Blitz
Department of Chemistry, University of Leeds, Leeds, UK
Received 21 March 2005; revised 21 July 2005; accepted 22 August 2005; published 22 November 2005.
[1] We have used the TOMCAT three-dimensional chemical transport model (CTM) to
investigate the impact of recent laboratory measurements of the temperature dependence
of the acetone photolysis quantum yield on global tropospheric chemistry. The new
acetone quantum yields cause a significant decrease in the calculated acetone loss rate in
troposphere. The annual global mean photolysis loss of acetone is reduced by a factor of
$2, making OH oxidation the dominant acetone sink. Photolysis rates decrease by
between $80 and 90% in the cold upper troposphere (UT). The atmospheric lifetime of
acetone increases from 22 to 35 days, with an increase in the global burden from 2.6 to
4.1 Tg. This is maintained through a global source strength of 42.5 Tg/yr, which is
approximately half of that inferred by some previous model studies. Comparisons of
modeled and observed acetone profiles from the remote tropical Pacific demonstrate much
improved agreement with the new quantum yields, with a reduction in the model bias

  

Source: Arnold, Steve - School of Earth and Environment, University of Leeds
Chipperfield, Martyn - School of Earth and Environment, University of Leeds

 

Collections: Environmental Sciences and Ecology; Geosciences