Relations Of The Tibetan Plateau And Atmospheric Ozone And The Tropopause

Using TOMS and SAGE II data, including ozone concentration and tropopause, this study is focused on the ozone distribution and variation over the Tibetan Plateau, and the relation between the ozone and tropopause, and results in the followings:The Tibet ozone low is again confirmed, and furthermore, the south to north difference of the ozone distribution is revealed, including a closed low ozone area in the south and a light low ozone perturbation in the north. The Tibetan tropopause is obviously different from the other regions at the same latitudes, c.a. 0.7 km higher in average, and the seasonal height variation of tropopause over Tibet is distinguished, in amplitude and phase, over the corresponding latitudes. The seasonal variations of ozone and tropopause height are difficult to be correlated, and however, the differences of the variations between the plateau and the same latitude regions appear clear anti-phase correlation. The ozone concentration and tropopause over the Tibetan Plateau show different distribution and variation features from the other latitudes, and the isolines of ozone concentration cross over the tropopause over Tibet, which may indicates a troposphere-stratosphere exchange. The Tibet low ozone concentration is located above the tropopause, at c.a. 18 km a.s.l., and its south-north position is decided by the variation of the elevated tropopause.Therefore, both the ozone and tropopause over the Tibetan Plateau are differed from the other regions, and the tropopause lifting over Tibet and the ozone decreasing have close spatial and temporal anti-phase correlation.