1. Trend of ozone content in the layers in the stratosphere and troposphere at the stations in Central Europe Peter Križan1, Janusz Krzyscin2 1) Institute of Atmospheric Physics, Academy of Science of the Czech Republic, Prague, Czech Republic, krizan@ufa.cas.cz 2) Institute of Geophysics, Polish Academy of Science, Warsaw, Poland, jkrzys@igf.edu.plkrizan@ufa.cas.cz Preface In this presentation we present the trend of the ozone content in the selected layers in the stratosphere and troposphere at stations in Central Europe where the vertical ozone profile is measured :Hoheinpeissenberg (47.8° N,11,0° E, Germany), Payerne (46.5° N, 6.6° E, Switzerland), Uccle (50.8° N,4.3° E, Belgium), Prague- Libuš (50.0° N, 14.4° E, the Czech Republic), Legionowo (52.4° N, 21.0° E, Poland) and Lindenberg(52.2° N, 14.1° E, Germany). We use the following layers in the stratosphere : 63-40 hPa, 100-63 hPa, 158-100 hPa; layers in the troposphere-stratosphere region : 250 hPa, and/or the pressure of the tropopause up to158 hPa, 400 hPa up to 250 hPa and/or the pressure of the tropopause; layers in the troposphere : 630-400 hPa and the ground-630 hPa (Tarasick,2005). We introduce the modification of the tropopause determination due to the small number of measurements in the vertical ozone profile in case of Brewer-Mast ozonesonde. Fig.1 : Trend of total ozone with error bars in a certain layers in the period 1970-2004 at the Payern(blue line),Hoheinpeissenberg (red line) and Uccle (black line) in winter. Fig.2 : Trend of total ozone with error bars in a certain layers in the period 1970-2004 at the Payern(blue line),Hoheinpeissenberg (red line) and Uccle (black line) in spring. Fig.3 : Trend of total ozone with error bars in a certain layers in the period 1970-2004 at the Payern(blue line), Hoheinpeissenberg (red line) and Uccle (black line) in summer. Fig.4 : Trend of total ozone with error bars in a certain layers in the period 1970-2004 at the Payern (blue line), Hoheinpeissenberg (red line) and Uccle (black line) in autumn. Fig.5 : Trend of total ozone with error bars in a certain layers in the period 1980-2004 at the Payern(blue line),Hoheinpeissenberg (red line), Uccle (black line), Prague –Libus ( magenta line), Legionowo (cyan line) and Lindenberg (yellow line) in winter. Fig.6 : Trend of total ozone with error bars in a certain layers in the period 1980-2004 at the Payern(blue line),Hoheinpeissenberg (red line), Uccle (black line), Legionowo (cyan line) and Lindenberg (yellow line) in spring Fig.7 : Trend of total ozone with error bars in a certain layers in the period 1980-2004 at the Payern(blue line),Hoheinpeissenberg (red line), Uccle (black line), Legionowo (cyan line) and Lindenberg (yellow line) in summer Fig.8 : Trend of total ozone with error bars in a certain layers in the period 1980-2004 at the Payern(blue line),Hoheinpeissenberg (red line), Uccle (black line), Legionowo (cyan line) and Lindenberg (yellow line) in autumn Fig.9 : Trend of total ozone with error bars in a certain layers in the period 1993-2004 at the Payern(blue line), Hoheinpeissenberg (red line), Uccle (black line), Prague –Libus ( magenta line), Legionowo (cyan line) and Lindenberg (yellow line) in winter. Fig.10 : Trend of total ozone with error bars in a certain layers in the period 1993-2004 at the Payern(blue line), Hoheinpeissenberg (red line), Uccle (black line), Legionowo (cyan line) and Lindenberg (yellow line) in spring Fig.11 : Trend of total ozone with error bars in a certain layers in the period 1993-2004 at the Payern(blue line), Hoheinpeissenberg (red line), Uccle (black line), Legionowo (cyan line) and Lindenberg (yellow line) in summer Fig.12 : Trend of total ozone with error bars in a certain layers in the period 1993-2004 at the Payern(blue line), Hoheinpeissenberg (red line), Uccle (black line), Legionowo (cyan line) and Lindenberg (yellow line) in autumn Conlusions The negative trends in the lower stratosphere ozone in the period 1970-2005 become weaker in the period 1980-2005, and some of them turn to positive trend in the 1993-2005 period. This picture is much better expressed in the winter and spring data. The opposite pattern is found in the tropospheric layers, i.e., the trends turn from positive (for the longest period) to negative or statistically insignificant (for the shortest period). The trends over Legionowo and Prague are positive (if statistically significant) both in the troposhe- re and the lower stratosphere or statistically insignificant over the period of the ECC measurements (1993-2005). References Tarasick, D.W.,Fioletov, V.E., Wardle, D.I., Kerr, J.B. and Davies, J.(2005): Changes in the vertical distribution of ozone over Canada from ozonesondes: 1980-2001, J. Geophys.Res., 110, D02304,doi 10.1029/2004JD004643