The data sets examined are products from efforts at the State University of New York ant Albany ( SUNYA), U. K. Universities Global Atmospheric Modelling Programme (UGAMP) and Free University Berlin / Royal Netherlands Meteorolgical Institute (FUB/KNMI). All these data set are generated from ozonesondes and satellite retrievals from a number of platforms. Each group employed different techniques for merging the data from the disparate sources. The base data are also from different time periods. The tropospheric estimates represent the greatest observational uncertainty.
Compared to an older data set, all the new compilations show the presence of ozone depletion in the austral spring near the South Pole. (pdf file)