Atmos. Chem. Phys., 4, 1407-1417, 2004
www.atmos-chem-phys.net/4/1407/2004/
doi:10.5194/acp-4-1407-2004
© Author(s) 2004. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Investigation of Arctic ozone depletion sampled over midlatitudes during the Egrett campaign of spring/summer 2000
D. E. M. Ross1,*, J. A. Pyle1,2, N. R. P. Harris1,3, J. D. McIntyre1, G. A. Millard1, A. D. Robinson1, and R. Busen4
1Centre for Atmospheric Sciences, Department of Chemistry, University of Cambridge, Cambridge, UK
2NCAS-ACMSU, Department of Chemistry, University of Cambridge, Cambridge, UK
3European Ozone Research Coordinating Unit, University of Cambridge, Cambridge, UK
4Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
*now at: JMP Consulting, London, UK

Abstract. 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.

Citation: Ross, D. E. M., Pyle, J. A., Harris, N. R. P., McIntyre, J. D., Millard, G. A., Robinson, A. D., and Busen, R.: Investigation of Arctic ozone depletion sampled over midlatitudes during the Egrett campaign of spring/summer 2000, Atmos. Chem. Phys., 4, 1407-1417, doi:10.5194/acp-4-1407-2004, 2004.
 
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