Effects of planetary wave-breaking on the seasonal variation of total column ozone

The effects of planetary wave breaking on the seasonal variation of total c olumn ozone are investigated using a zonally averaged chemical-radiative-tr ansport model of the atmosphere. The planetary wave breaking effects of zon al wavenumbers k=1 and k=2 are significant in the middle latitude stratosph ere during Northern Hemisphere (NH) winter, whereas only wave k=1 is import ant during Southern Hemisphere (SH) winter. The mixing and induced meridion al circulation due to the planetary wave breaking increases the seasonal va riation of total column ozone in NH (SH) middle latitudes by similar to 20% (similar to 10%).