
A study of the latitudinal dependence of the quasi-biennial oscillation in Total Ozone Mapping Spectrometer total ozone
Abstract
A wavelet multiresolution analysis of the quasi-biennial oscillation (QBO) latitudinal structure in total ozone is performed for the period 1979–1992 (Nimbus-7 TOMS data). It has been found that ozone is nearly in phase with the QBO signal in the equatorial region (0°—5° and 5°—10°), and it is out of phase (lag ~ +15 and —15 months in north and south) in the 10°—15° to 55°—60° latitudinal bands. The cross-correlation coefficient between total ozone and zonal wind index is high (>0.7) at latitudes lower than 10°, decreases in the transition region 10°—15° (r ~ 0.4) and it has a non-linear profile at high latitudes, with a maximum near the 25°—30° band. The correlation is observed to be higher in the Southern Hemisphere latitudinal bands. Spectral analysis was performed for each latitudinal range, and QBO period and amplitude profiles were obtained. A detailed latitudinal profile of the QBO signal in total ozone is obtained from the present analysis.
© 2004 E. Echer, F. L. Guarnieri, N. R. Rigozo, L. E. A. Vieira, published by Stockholm University Press
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