Abstract
Abstract Interannual changes of dynamical structure and ozone are investigated in the Tropics and Southern Hemisphere over the 1980s and 1990s. Changes of dynamical structure over the winter hemisphere are accompanied by coherent changes over the summer hemisphere, but of opposite sign. They are most noticeable during northern winter, when amplified planetary waves of the Northern Hemisphere drive strong downwelling in the Arctic stratosphere that penetrates well into the troposphere. Changes over the summer hemisphere operate coherently and in phase with weaker changes over the Tropics. Coherent changes appear even inside the tropical troposphere, where they coincide with regions of deep convection. Changes in the summer hemisphere and Tropics both operate coherently but out of phase with changes over the Arctic, which in turn operate coherently with anomalous forcing of the residual mean circulation. Anomalous summertime structure modulates the polar low in the upper troposphere and lowermost stratosphe...
Published Version
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