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Introduction

Vertical ozone profiles in northern mid-latitudes show large variability and  are strongly influenced by dynamical processes and the associated atmospheric transport.
In this study we want to specify the dynamical contributions to this variability and link  ozone deviations with the origin of air masses.
Ozone profiles have been measured 3 times a week by MeteoSwiss at Payerne, Switzerland (46.80N, 6.95E, 490 a.s.l.) since autumn 1968.
The high resolution ozone profiles are sensored by a Brewer-Mast sonde. A correction factor scales the soundings to match the total ozone values measured at Arosa, Switzerland. Ozone deviations are calculated with respect to the 30-year monthly means in units of standard deviations in the lower and middle stratosphere. The vertical range comprises the region of the climatological ozone maximum.
10-day backward trajectory calculations were performed for each of the ozone profiles between 1977 and 2000 with on 16 isentropic surfaces between 340K and 700K which correspond to pressure levels between about 300hPa and 20hPa. These calculations are based on wind fields from the NCEP reanalysis data set.