Seasonal acceleration of the rate of total ozone decreases over Central Europe: impact of tropopause height changes

Details Seasonal acceleration of the rate of total ozone decreases over Central Europe: impact of tropopause height changes Seasonal acceleration of the rate of total ozone decreases over Central Europe: impact of tropopause height changes

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1755k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 18, p. 1755-1762.

Physics

6

Scientific paper

Total ozone data from some European stations have been analyzed to detect the ozone decrease in different seasons from 1979 to 1995. The differences between the winter-spring (December-March) and summer (May-August) total ozone means have decreased distinctly during the last three decades, by ~10 Dobson Units per decade, showing that the winter-spring decrease is significantly stronger than the summer one. Applying a multiple regression model to the monthly means of tropopause height, positive trends in the summer and winter-spring seasons have been found, especially since 1979. This corresponds to the accelerating ozone decrease then. The possibility of using tropopause height variations as an indicator of dynamical variability in the total ozone trend model is discussed. The total ozone response to the changes of tropopause height seems to be independent of timescale over which the tropopause-total ozone relationship has been examined (month-to-month, interannual). The total ozone trends, as well as the accelerated rate of ozone decrease since 1979 in the winter-spring and summer seasons, respectively, are reduced by about 0.5-1% per decade after inclusion of the tropopause height effect on the ozone model.

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