Abstract
Statistical tests of a possible association between total ozone at Arosa and indices of the Southern Oscillation give indefinite but not unpromising answers: linear correlation coefficients between 12-month running means are statistically significant for both halves of the period 1935–1980, whereas the squared coherences are statistically significant in the first but not in the second half of the period. The phases in both periods are consistent, however. Our investigation shows that a relationship between the total ozone amounts at Arosa and the Southern Oscillation, must be in the sense that when the sea level mean pressure is low over the central tropical South Pacific Ocean while it is high in the Indonesian region, the total ozone amounts at Arosa tend to be large, and conversely.
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