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This volume is the final report of the ARCTOC project (1994-1996) whose main aim was to understand the mechanism of sudden polar tropospheric ozone loss events which were discovered about 10 years ago. Since then, these episodes had been observed at several Arctic sites, where tropospheric ozone drops from the normal 30-40 ppb to very low mixing ratios. This report describes the results of field, laboratory and modelling activities, indicating the still remaining questions which need further investigation concerning, in particular, the details of halogen activation mechanism and the comparison of the phenomenon of sudden ozone loss with the similar one at other latitudes and in Antarctica.

Additional information

Authors: PLATT U, Institut für Umweltphysik, University of Heidelberg (DE);LEHRER E (EDITORS), Institut für Umweltphysik, University of Heidelberg (DE)
Bibliographic Reference: EUR 17783 EN (1997) 330pp., free of charge
Availability: Available from the European Commission, DG XII-D-1, 200 rue de la Loi, B-1049 Bruxelles (BE), Fax: +32-2-2952097
ISBN: ISBN 92-828-2350-4
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