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Global total ozone measurements from various satellite instruments  such as SBUV, TOMS, and GOME show an increase in zonal mean total  ozone at northern hemispheric (NH) mid to high latitudes since the  mid-nineties. This increase could be expected from the peaking and  start of decline in the effective stratospheric halogen loading, but  the rather rapid increase observed in NH zonal mean total ozone  suggests that another physical mechanism such as winter planetary  wave activity has increased which has led to higher stratospheric  Arctic temperatures. This has enhanced ozone transport into higher  latitudes in recent years as part of the residual circulation and at  the same time reduced the frequency of cold Arctic winters with  enhanced polar ozone loss. Results from various multi-variate linear  regression analyses using SBUV V8 total ozone with explanatory  variables such as a linear trend or, alternatively, EESC (equivalent  effective stratospheric chlorine) and on the other hand planetary  wave driving (eddy heat flux) or, alternatively, polar ozone loss  (PSC volume) in addition to proxies for stratospheric aerosol  loading, QBO, and solar cycle, all considered to be main drivers for  ozone variability, are presented. It is shown that the main  contribution to the recent increase in NH total ozone is from the  combined effect of rising tropospheric driven planetary wave  activity associated with reduced polar ozone loss at high latitudes  as well as increasing solar activity.  This conclusion can be drawn  regardless of the use of linear trend or EESC terms in our  statistical model. It is also clear that more years of data will be  needed to further improve our estimates of the relative  contributions of the individual processes to decadal ozone  variability. The question remains if the observed increase in  planetary wave driving is part of natural decadal atmospheric  variability or will persist. If the latter is the case, it could be  interpreted as a possible signature of climate change

On the possible causes of recent increases in northern hemispheric total ozone from a statistical analysis of satellite data from 1979 to 2003