Total ozone depletion over Greece as deduced from satellite observations

The reprocessed (version 7) daily total ozone observations made by the Tota l Ozone Mapping Spectrometer (TOMS) on the Nimbus-7 satellite over Athens ( 37.6 degrees N, 23.4 degrees E) for the period from November 1978 until Apr il 1993 have been used to investigate total ozone depletion. To estimate th e trends in total ozone content a linear fitting to the data has been appli ed, given that the other components like the quasi-biennial oscillation, th e El Nino/Southern Oscillation and the solar cycle have a very small contri bution to the total ozone depletion effects over that geographical region. The total ozone depletion over the 15-year period was derived from version 7 shows a strong seasonal variation from more than 6% in winter and early s pring to about 1.5% in summer. The total ozone depletion over Greece is fou nd to be about 1% (per decade) less using version 7 than using version 6.