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| Titel |
Investigation of Arctic ozone depletion sampled over midlatitudes during the Egrett campaign of spring/summer 2000 |
| VerfasserIn |
D. E. M. Ross, J. A. Pyle, N. R. P. Harris, J. D. McIntyre, G. A. Millard, A. D. Robinson, R. Busen |
| 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 ; 4, no. 5 ; Nr. 4, no. 5 (2004-08-27), S.1407-1417 |
| Datensatznummer |
250001950
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| Publikation (Nr.) |
 copernicus.org/acp-4-1407-2004.pdf |
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| Zusammenfassung |
| A unique halocarbon dataset has been obtained using the Australian high
altitude research aircraft, the Grob G520T Egrett, during May-June 2000 with
GC instrument (DIRAC), which has been previously deployed on balloon
platforms. The halocarbon data generally shows a good anticorrelation with
ozone data obtained simultaneously from commercial sensors. On 5 June
2000, at 380K, the Egrett entered a high latitude tongue of air over the
U.K. CFC-11 and O3 data obtained on the flight show evidence of this
feature. The dataset has been used, in conjunction with a 3D chemical
transport model, to infer ozone depletion encountered in the midlatitude
lower stratosphere during the flight. We calculate that ozone is depleted by
20% relative to its winter value in the higher latitude airmass. A suite
of ozone loss tracers in the model have been used to track ozone depletion
according to location relative to the vortex and chemical cycle responsible.
The model, initialised on 9 December, indicates that 50% of the
total chemical ozone destruction encountered in June in the middle latitudes
occurred in the 90-70°N equivalent latitude band and that 70%
was due to halogen chemistry. |
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