Note on variations in the 'quasi-biennial' oscillation.

Data compiled since 1962 are examined in an effort to quantify further the observed variations in the 'quasi-biennial' oscillation (QBO). A further study of temperatures and zonal winds is conducted for Canton Island, Ascension Island, and Balboa, C.Z. Statistics are derived for the period of record prior to 1962 and for that subsequent to 1962. The results of the investigation suggest that the QBO has remained in roughly geostrophic equilibrium since it was first observed.-