. Compendium of meteorology. Meteorology. 280 THE UPPER ATMOSPHERE average is given below: cm cm January ± May ± February ± June ± March ± July ± April ± August ± It is apparent that the fluctuation is twice as great in winter as it is in summer and fall; in winter, as well as in spring, it is considerably greater at Tromso than it September ± October ± November ± December ±,S. tor-cocno — c\Jr<i^ir)U3t^co(jio — wrO';riniDi--2cn <NJOJC\JC\JrOfOrorOrorororOrorO^^'^^^^^^'^'^ mm w 5 Fig. 8.—Secular fluctuatio
. Compendium of meteorology. Meteorology. 280 THE UPPER ATMOSPHERE average is given below: cm cm January ± May ± February ± June ± March ± July ± April ± August ± It is apparent that the fluctuation is twice as great in winter as it is in summer and fall; in winter, as well as in spring, it is considerably greater at Tromso than it September ± October ± November ± December ±,S. tor-cocno — c\Jr<i^ir)U3t^co(jio — wrO';riniDi--2cn <NJOJC\JC\JrOfOrorOrorororOrorO^^'^^^^^^'^'^ mm w 5 Fig. 8.—Secular fluctuation of the ozone amount. Vertical broken lines represent sunspot minima; vertical solid lines, sunspot maxima. is at Arosa; the series is thus subject to the same in- fluence which also causes the meteorological (inter- diurnal) variability. If one were to seek a direct cor- relation between ozone and solar activity, then the double fluctuations of the Eurasian large-scale weather within the sunspot cycle according to Baur [7] would be of interest. In the lower yearly average curve of Fig. 8, the vertical solid lines represent sunspot maxima, the vertical broken lines represent sunspot minima. For the yearly averages the following correlation co- efficients are obtained. Correlation coefficient Ozone and relative sunspot number + Ozone and air pressure — Ozone and solar constant + As regards the analysis of other long series of observa- tions, there exists only the attempt [11, 93] to determine ozone by means of the Chappuis band from the Smith- sonian measurements. Even though wide scattering of these values makes them seem rather unreliable, it is nevertheless interesting to note the very slight ozone amount during the year 1912 since it has been ascribed to an effect of the eruption of the Katmai Volcano [37]. Such a possibility has also been discussed by E. Regener [84]. The Vertical Distribution of Ozone. The vertical dis- tribution of ozone,
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