Vortex-averaged Arctic ozone depletion in the winter 2002/2003

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General Information:

Christensen, T. , Knudsen, B. M. , Streibel, M. , Andersen, S. B. , Benesova, A. , Braathen, G. , Claude, H. , Davies, J. , Backer, H. D. , Dier, H. , Dorokhov, V. , Gerding, M. , Gil, M. , Henchoz, B. , Kelder, H. , Kivi, R. , Kyrö, E. , Litynska, Z. , Moore, D. , Peters, G. , Skrivankova, P. , Stübi, R. , Turunen, T. , Vaughan, G. , Viatte, P. , Vik, A. F. , Zaitcev, I. and von der Gathen, P. (2005): Vortex-averaged Arctic ozone depletion in the winter 2002/2003 , Atmospheric chemistry and physics, 5 , pp. 131-138 .
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Supplementary Information:


A total ozone depletion of 68±7 Dobson units between 380 and 525K from 10 December 2002 to 10 March 2003 is derived from ozone sonde data by the vortex-average method, taking into account both diabatic descent of the air masses and transport of air into the vortex. When the vortex is divided into three equal-area regions, the results are 85±9DU for the collar region (closest to the edge), 52±5DU for the vortex centre and 68±7DU for the middle region in between centre and collar.Our results compare well with other studies: We find good agreement with ozone loss deduced from SAOZ data, with results inferred from POAM III observations and with results from tracer-tracer correlations using HF as the long-lived tracer. We find a higher ozone loss than that deduced by tracer-tracer correlations using CH4.We have made a careful comparison with Match results: The results were recalculated using a common time period, vortex edge definition and height interval. The two methods generally compare very well, except at the 475K level which exhibits an unexplained discrepancy.

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