The seasonal total column ozone (TOZ) trends derived from satellite and ground-based instrumentation between June 1991-July 1999 at Athens, Greece, appear to be opposite to those of the period November 1978-May 1991. In the post-Pinatubo period large negative trends in TOZ during summertime combined with the large positive trends in TOZ during fall-winter period result in a decrease of the annual peak-to-trough differences from those of the pre-Pinatubo period.
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Varotsos et al. (2000) studied this question.