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| Titel |
Impact of mixing and chemical change on ozone-tracer relations in the polar vortex |
| VerfasserIn |
R. Müller, S. Tilmes, P. Konopka, J.-U. Grooß, H.-J. Jost |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 5, no. 11 ; Nr. 5, no. 11 (2005-11-23), S.3139-3151 |
| Datensatznummer |
250003155
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| Publikation (Nr.) |
 copernicus.org/acp-5-3139-2005.pdf |
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| Zusammenfassung |
| Tracer-tracer relations have been used for a long time to separate
physico-chemical change from change caused by transport processes.
In particular, for more than a decade, ozone-tracer relations have
been used to quantify chemical ozone loss in the polar vortex. The
application of ozone-tracer relations for quantifying ozone loss
relies on two hypotheses: that a compact ozone-tracer relation is
established in the 'early' polar vortex and that any change of the
ozone-tracer relation in the vortex over the course of winter is
caused predominantly by chemical ozone loss. Here, we revisit this
issue by analysing various sets of measurements and the results from
several models. We find that mixing across the polar vortex edge
impacts ozone-tracer relations in a way that may solely lead to an
'underestimation' of chemical ozone loss and not to an
overestimation. Further, differential descent in the vortex and
internal mixing has only a negligible impact on ozone loss
estimates. Moreover, the representation of mixing in
three-dimensional atmospheric models can have a substantial impact
on the development of tracer relations in the model. Rather compact
ozone-tracer relations develop – in agreement with observations –
in the vortex of a Lagrangian model (CLaMS) where mixing is
anisotropic and driven by the deformation of the flow. We conclude
that, if a reliable 'early vortex' reference can be obtained and if
vortex measurements are separated from mid-latitude measurements,
ozone-tracer relations constitute a reliable tool for the
quantitative determination of chemical ozone loss in the polar
vortex. |
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