Evidence for a Quasi-Biennial Variation in Eccentricity of the North Polar Vortex

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Abstract
The centroid of the north polar vortex has been determined from 300 mb mean-monthly maps for the 10-year period 1963–72. There is a significant correlation of 0.79 between the 12-month running average distance of the centroid from the North Pole and the 50 mb zonal wind at Balboa, Canal Zone; i.e., the eccentricity appears to be greater at the time of quasi-biennial cast wind minimum