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Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999

A. Schulz 1 M. Rex 1 N. Harris 2 G. Braathen 3 E. Reimer 4 R. Alfier 4 I. Kilbane-Dawe 2 S. Eckermann 5 M. Allaart 6 M. Alpers 7 B. Bojkov 3 J. Cisneros 8 H. Claude 9 E. Cuevas 10 J. Davies 11 H. de Backer 12 H. Dier 9 V. Dorokhov 13 H. Fast 11 Sophie Godin 14 B. Johnson 15 B. Kois 16 Y. Kondo 17 E. Kosmidis 18 E. Kyrö 19 Z. Litynska 17 I. Mikkelsen 20 M. Molyneux 21 G. Murphy 22 T. Nagai 23 H. Nakane 24 F. O'Connor 25 C. Parrondo 26 F. Schmidlin 27 P. Skrivankova 28 C. Varotsos 29 C. Vialle 14 P. Viatte 30 V. Yushkov 13 C. Zerefos 18 P. von der Gathen 1
Abstract : Chemical ozone loss rates inside the Arctic polar vortex were determined in early 1998 and early 1999 by using the Match technique based on coordinated ozonesonde measurements. These two winters provide the only opportunities in recent years to investigate chemical ozone loss in a warm Arctic vortex under threshold conditions, i.e., where the preconditions for chlorine activation, and hence ozone destruction, only occurred occasionally. In 1998, results were obtained in January and February between 410 and 520 K. The overall ozone loss was observed to be largely insignificant, with the exception of late February, when those air parcels exposed to temperatures below 195 K were affected by chemical ozone loss. In 1999, results are confined to the 475 K isentropic level, where no significant ozone loss was observed. Average temperatures were some 8°-10° higher than those in 1995, 1996, and 1997, when substantial chemical ozone loss occurred. The results underline the strong dependence of the chemical ozone loss on the stratospheric temperatures. This study shows that enhanced chlorine alone does not provide a sufficient condition for ozone loss. The evolution of stratospheric temperatures over the next decade will be the determining factor for the amount of wintertime chemical ozone loss in the Arctic stratosphere.
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A. Schulz, M. Rex, N. Harris, G. Braathen, E. Reimer, et al.. Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2001, 106 (D7), pp.7495-7503. ⟨10.1029/2000JD900653⟩. ⟨insu-03097721⟩

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