Abstract
It is well established that extensive depletion of ozone, initiated by heterogenous reactions on polar stratospheric clouds (PSCs) can occur in both the Arctic and Antarctic lower stratosphere1,2,3,4,5,6,7,8,9. Moreover, it has been shown that ozone loss rates in the Arctic region in recent years reached values comparable to those over the Antarctic8,9. But until now the accumulated ozone losses over the Arctic have been the smaller, mainly because the period of Arctic ozone loss has not—unlike over the Antarctic—persisted well into springtime8,9,10. Here we report the occurrence—during the unusually cold 1995–96 Arctic winter—of the highest recorded chemical ozone loss over the Arctic region. Two new kinds of behaviour were observed. First, ozone loss at some altitudes was observed long after the last exposure to PSCs. This continued loss appears to be due to a removal of the nitrogen species that slow down chemical ozone depletion. Second, in another altitude range ozone loss rates decreased while PSCs were still present, apparently because of an early transformation of the ozone-destroying chlorine species into less active chlorinenitrate. The balance between these two counteracting mechanisms is probably a fine one, determined by small differences in wintertime stratospheric temperatures. If the apparent cooling trend in the Arctic stratosphere11 is real, more dramatic ozone losses may occur in the future.
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Acknowledgements
We thank the following for cooperation and for providing ozonesonde data: H. De Backer, Royal Meteorol. Inst.; D. Balis and I. Ziomas, Univ. Thessaloniki; H. Claude, Meteorol. Obs. Hohenpeißenberg; S. Godin and M. Guirlet, CNRS, Univ. Paris; B. Kois, Inst. of Meteorol. and Water Management; G. Murphy, Irish Meteorol. Service; S. J. Reid, Univ. Wales; F. H. Sigurdsson, Icelandic Meteorol. Office; C. Varotsos, Univ. Athens; V. Yushkov, Central Aerol. Obs.; National Space Development Agency of Japan and all others involved in Match. We also thank G. L. Manney and M. L. Santee for providing the MLS data, and the ECMWF and the German Weather Service for providing meteorological data. The chemistry model used was based on a model from G. Brasseur (NCAR, USA). This work was supported by the Environment and Climate Program of DG-XII of the EC, the UK DETR and the German BMBF.
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Rex, M., Harris, N., von der Gathen, P. et al. Prolonged stratospheric ozone loss in the 1995–96 Arctic winter. Nature 389, 835–838 (1997). https://doi.org/10.1038/39849
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DOI: https://doi.org/10.1038/39849
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