Midwinter Ozone Variations and Stratospheric Flow over Canada, 1958–1959

The total ozone variations at Edmonton and Moosonee during December, 1958 and January, 1959 are examined in relation to daily synoptic analysis up to the 25-mb level. The stratospheric perturbations of the polar-night westerlies appear to dominate the ozone record when that régime is over the station. Otherwise, the usual Normand tropospheric perturbation effect is indicated. Correspondence is analyzed using adiabatic vertical motions computed at the 200, 100 and 25-mb levels, in addition to the 200-mb geopotential height and the 100–15-mb thickness.