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Conclusion

We have examined the vertical phase structure of TBO and QBO in Temperature over the near equatorial Indian station Thuma. The decadal change of phase coherence between TBO and QBO in temperature and correlation between these oscillations suggests that they are different phenomena. Two nearly biennial phenomena with slightly different periods are expected to drift in and out of phase on decadal timescales. The strong relation between the phase of TBO and Indian summer monsoon activity suggest that the atmosphere-ocean-monsoon interaction may be the cause for the TBO.

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