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Results and discussion

In fig. 1, the time seriesÕ of zonal wind and temperature anomaly at two levels, 11 and 21 km representing middle troposphere and lower stratosphere are presented. Corresponding real part of the Morelet wavelet transform is presented in fig 2 & 3. In zonal wind, annual mode is the only oscillation in the troposphere and both annual and biennial oscillations are strong in the lower stratosphere. In temperature anomaly, 11-year solar cycle, biennial, annual and semi annual oscillations are seen in both lower stratosphere and troposphere (octaves -2, -1, 0, 1, 2, 3, 4 corresponds to 2, 4, 8, 16, 32, 64, 128 month periodicities respectively). This clearly shows the presence of biennial oscillations both in lower stratosphere and troposphere in temperature and only in lower stratosphere in zonal wind.

Fig. 1

Fig. 2 Real part of the Morelet wavelet coefficients of monthly mean temperature anomaly at 11 km

Fig. 3 Real part of the Morelet wavelet coefficients of monthly mean temperature anomaly at 21 km

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