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The length of the westerly phase of the quasi-biennial oscillation (QBO) of zonal wind in the equatorial stratosphere is examined using the longest available record (1950–2001). An earlier finding by Salby and Callagan of a systematic quasi-decadal modulation of the QBO period is confirmed, although the earlier suggestion of a strong connection with the solar cycle is less clear in the extended record.

On the Quasi-Decadal Modulation of the Stratospheric QBO Period