Short-term variability in ozone column at a givenlocation is almost solely caused by dynamical changes connected totropospheric pressure systems. Long-term trends and interannual variabilityof ozone are also influenced by these dynamical changes. We address twoquestions here, which are still under discussion: What is the impact of thesedynamical changes on the observed long-term trend of ozone, and what is thequantitative contribution of the physical processes standing behind thedynamical variability to the trends and short-term variability? Theseprocesses are identified as horizontal isentropic transport and the verticaldisplacement of isentropes. We use a multiple regression model to analyze thevariability of the total ozone column and of profile data here.The model for ozone column is based on a newly introduced explanatoryvariable using the equivalent latitude profile at a givenlocation. After transforming the equivalent latitude profile into an ozoneprofile with the help of an ozone climatology, we integrate the ozone profileby using the pressures at the isentropic levels, thus incorporating the effectof compression and expansion. Ozone column data are taken from high qualitystations of the Dobson spectrometer network.Profile data from ozone sondes is examined by the equivalent latitude profilealone.