The spatial variation of ozone depletion in Europe

We have previously used data from the TOMS instrument, which was flown on Nimbus-7, to study total ozone column amounts for a number of different locations in Europe, including Athens, Thessaloniki, Crete, Dundee and St. Petersburg, In each case we have studied the monthly average ozone amount over a period of a decade or more. There is no doubt that there has been an overall depletion during this period. However, there are very considerable differences among the behaviour of the monthly averages. For some months and for some locations there is a quite large depletion, while for other months and locations there are quite small depletions or even no significant depletion at all. We have recently extended the network of locations at which we have studied these monthly averages to include London, Berlin, Mallorca and Naples. The results will be presented in this paper and compared with the results obtained for other locations previously.