Note on Variations in the “Quasi-Biennial” Oscillation

RAYMOND M. McINTURFF National Meteorological Center, National Weather Service, NOAA, Hillcrest Heights, Md.

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ALVIN J. MILLER National Meteorological Center, National Weather Service, NOAA, Hillcrest Heights, Md.

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Abstract

Significant temporal variations in the “quasi-biennial” oscillation (QBO) of the equatorial stratosphere raise questions concerning relationships between the various characteristics of the oscillation. A comparison of observations made before 1962 with those made after 1962 suggests the following relationships: β ≈ PU/4 in the 10- to 30-mb layer; PU/8≤β≤PU/4 in the 30- to 50-mb layer; and cUPU ≈ constant from 10 to 50 mb (where β is the phase difference between the zonal wind-QBO and temperature-QBO, PU is the period of the zonal wind-QBO, and cU is the speed of vertical propagation of the zonal wind-QBO).

Abstract

Significant temporal variations in the “quasi-biennial” oscillation (QBO) of the equatorial stratosphere raise questions concerning relationships between the various characteristics of the oscillation. A comparison of observations made before 1962 with those made after 1962 suggests the following relationships: β ≈ PU/4 in the 10- to 30-mb layer; PU/8≤β≤PU/4 in the 30- to 50-mb layer; and cUPU ≈ constant from 10 to 50 mb (where β is the phase difference between the zonal wind-QBO and temperature-QBO, PU is the period of the zonal wind-QBO, and cU is the speed of vertical propagation of the zonal wind-QBO).

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