Journal article

The potential impact of ClOx radical complexes on polar stratospheric ozone loss processes

Vogel B, Feng W, Streibel M, Mueller R ...see all

Atmospheric Chemistry and Physics, vol. 6 (2006) pp. 3099-3114

  • 7

    Readers

    Mendeley users who have this article in their library.
  • N/A

    Citations

    Citations of this article.
Sign in to save reference

Abstract

The importance of radical-molecule complexes for atmospheric chemistry
has been discussed in recent years. In particular, the existence of a
ClO center dot O-2 and ClOx water radical complexes like ClO center dot
H2O, OClO center dot H2O, OClO center dot(H2O)(2), and ClOO center dot
H2O could play a role in enhancing the ClO dimer (Cl2O2) formation and
therefore may constitute an important intermediate in polar
stratospheric ozone loss cycles. Model simulations performed with the
Chemical Lagrangian Model of the Stratosphere (CLaMS) will be presented
to study the role of radical complexes on polar stratospheric ozone loss
processes. The model simulations are performed for the Arctic winter
2002/2003 at a level of 500 K potential temperature and the results are
compared to observed ozone loss rates determined by the Match technique.
Moreover, recently reported values for the equilibrium constant of the
ClO dimer formation are used to restrict the number of possible model
results caused by large uncertainties about radical complex chemistry.
Our model simulations show that the potential impact of ClO center dot
O-2 on polar ozone loss processes is small (dO(3)/ dt << 0.5
ppb/sunlight h) provided that the ClO center dot O-2 complex is only
weakly stable. Assuming that the binding energies of the ClOx water
complexes are much higher than theoretically predicted an enhancement of
the ozone loss rate by up to approximate to 0.5 ppb/sunlight h is
simulated. Because it is unlikely that the ClOx water complexes are much
more stable than predicted we conclude that these complexes have no
impact on polar stratospheric ozone loss processes. Although large
uncertainties about radical complex chemistry exist, our findings show
that the potential impact of ClOx radical molecule complexes on polar
stratospheric ozone loss processes is very small considering pure
gas-phase chemistry. However the existence of ClOx radical-molecule
complexes could possibly explain discrepancies for the equilibrium
constant of the ClO dimer formation found between recent laboratory and
stratospheric measurements.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Authors

  • B Vogel

  • W Feng

  • M Streibel

  • R Mueller

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free