Effect of zonally asymmetric ozone on stratospheric temperature and planetary wave propagation

For northern winter hemisphere, decadal means of zonally asymmetric stratospheric ozone are derived from ECMWF Reanalysis (ERA-40) and included in the GCM MAECHAM5 to investigate their effects on temperature and planetary wave propagation in the middle atmosphere. The stratospheric ozone of ERA-40 shows a strong decadal increase in wave one structure with amplitudes of 10% of zonal mean ozone during the 1990s. The model calculations reveal that the related radiation perturbations induce significant temperature changes increasing with height (-4 K at 50 hPa and -8 K at 0.1 hPa) due to an increase in amplitude and a shift in phase of stratospheric wave one. Also, we found an induced shift of up- and eastward directed stationary wave trains from the eastern to the western hemisphere. The results illustrate the important influence of ozone-dynamics interaction, and suggest that the decadal changes in zonally asymmetric ozone may have contributed largely to observed stratospheric temperature trends.