Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-11725-2007
http://www.atmos-chem-phys-discuss.net/7/11725/2007/
http://www.atmos-chem-phys-discuss.net/7/11725/2007/acpd-7-11725-2007.html
http://www.atmos-chem-phys-discuss.net/7/11725/2007/acpd-7-11725-2007.pdf
11725
11759
2007-08-09
The impact of mixing across the polar vortex edge on Match ozone loss estimates
J.-U. Grooß
j.-u.grooss@fz-juelich.de
R. Müller
P. Konopka
H.-M. Steinhorst
A. Engel
T. Möbius
C. M. Volk
Forschungszentrum Jülich, Institut für Chemie und Dynamik der Geosphäre, ICG-1: Stratosphäre, Germany
Johann Wolfgang Goethe-Universität, Frankfurt, Institut für Atmosphäre und Umwelt, Germany
The Match method for quantification of polar chemical ozone loss is
investigated mainly with respect to the impact of mixing across the
vortex edge onto this estimate.
We show for the winter 2002/03 that significant mixing across the
vortex edge occurred and was accurately modeled by the Chemical
Lagrangian Model of the Stratosphere. Observations of inert tracers
and ozone in-situ from HAGAR on the Geophysica aircraft and sondes
and also remote from MIPAS on ENVISAT were reproduced well. The
model even reproduced a small vortex remnant that was isolated until
June 2003 and was observed in-situ by a balloon-borne whole air
sampler.
We use this CLaMS simulation to quantify the impact of cross vortex
edge mixing on the results of the Match method.
It is shown that a time integration of the determined vortex average
ozone loss rates as performed in Match results in larger ozone loss
than the polar vortex average ozone loss in CLaMS.
Also, the determination of the Match ozone loss rates can be
influenced by mixing. This is especially important below 430 K,
where ozone outside the vortex is lower than inside and the vortex
boundary is not a strong transport barrier. This effect and further
sampling effects cause an offset between vortex average ozone loss
rates derived from Match and deduced from CLaMS with an even
sampling for the entire vortex.
Both, the time-integration of ozone loss and the determination of
ozone loss rates for Match are evaluated using the winter 2002/03
CLaMS simulation. These impacts can explain the differences between
CLaMS and Match column ozone loss.
While the investigated effects somewhat reduce the apparent
discrepancy in January ozone loss rates, a discrepancy between
simulations and Match remains. However, its contribution to the
accumulated ozone loss over the winter is not large.
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