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| Titel |
Stratosphere-troposphere exchange in a summertime extratropical low: analysis |
| VerfasserIn |
J. Brioude, J.-P. Cammas, O. R. Cooper |
| 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 ; 6, no. 8 ; Nr. 6, no. 8 (2006-06-22), S.2337-2353 |
| Datensatznummer |
250003933
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| Publikation (Nr.) |
 copernicus.org/acp-6-2337-2006.pdf |
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| Zusammenfassung |
| Ozone and carbon monoxide measurements sampled during two commercial flights
in airstreams of a summertime midlatitude cyclone are analysed with a
Lagrangian-based study (backward trajectories and a Reverse Domain Filling
technique) to gain a comprehensive understanding of transport effects on
trace gas distributions. The study demonstrates that summertime cyclones can
be associated with deep stratosphere-troposphere transport. A tropopause fold
is sampled twice in its life cycle, once in the lower troposphere (O3≃100 ppbv;
CO≃90 ppbv) in the dry airstream of the cyclone,
and again in the upper troposphere (O3≃200 ppbv; CO≃90 ppbv)
on the northern side of the large scale potential vorticity feature
associated with baroclinic development. In agreement with the maritime
development of the cyclone, the chemical composition of the anticyclonic portion of the
warm conveyor belt outflow (O3≃40 ppbv; CO≃85 ppbv)
corresponds to the lowest mixing ratios of both ozone and carbon
monoxide in the upper tropospheric airborne observations. The uncertain degree of
confidence of the Lagrangian-based technique applied to a 100 km segment of
upper level airborne observations with high ozone (200 ppbv) and relatively
low CO (80 ppbv) observed northwest of the cyclone prevents identification of the ozone
enrichment process of air parcels embedded in the cyclonic part of the
upper level outflow of the warm conveyor belt. Different hypotheses of
stratosphere-troposphere exchange are discussed. |
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