Interhemispheric asymmetry and annual synchronization of the ozone quasi-biennial oscillation

Physics

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Annual Variations, Ozonosphere, Time Series Analysis, Climatology, Northern Hemisphere, Planetary Waves, Southern Hemisphere, Zonal Flow (Meteorology)

Scientific paper

The quasi-biennial oscillation (QBO) in total column O3 has been examined at several tropical stations. The O3 QBO at Mauna Loa was found to have a remarkable annual synchronization. Both positive and negative extremes in the deseasonalized O3 time series almost always occur between December and March. The annual-cycle/QBO phase locking is much more pronounced in this O3 record than it is for the familiar QBO in the prevailing tropical stratospheric winds. This result is taken as evidence that the dynamical QBO acts to modulate a strong seasonal O3 transport from midlatitudes to the tropics. If this transport is connected with quasi-stationary planetary waves, then the interhemispheric asymmetry in the O3 QBO can be explained.

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