Abstract
<strong class="journal-contentHeaderColor">Abstract.</strong> The interaction between the factors of the quasi-biennial oscillation (QBO) and the 11-year solar cycle is considered as an separate factor influencing the interannual January-March variations of total ozone over Northeastern Europe. Linear correlation analysis and the running correlation method are used to examine possible connections between ozone and solar activity at simultaneous moment the QBO phase. Statistically significant correlations between the variations of total ozone in February and, partially, in March, and the sunspot numbers during the different phases of QBO are found. The running correlation method between the ozone and the equatorial zonal wind demonstrates a clear modulation of 11-y solar signal for February and March. Modulation is clearer if the QBO phases are defined at the level of 50 hPa rather than at 30 hPa. The same statistical analyses are conducted also for possible connections between the index of stratospheric circulation <i>C</i><sub>1</sub> and sunspot numbers considering the QBO phase. Statistically significant connections are found for February. The running correlations between the index <i>C</i><sub>1</sub> and the equatorial zonal wind show the clear modulation of 11-y solar signal for February and March. Based on the obtained correlations between the interannual variations of ozone and index <i>C</i><sub>1</sub>, it may be concluded that a connection between solar cycle â QBO â ozone occurs through the dynamics of stratospheric circulation.
Highlights
It is well known that the quasi-biennial oscillation (QBO) of zonal winds in the equatorial stratosphere has an inuence on the variability of many meteorological parameters in the stratosphere and troposphere (Holton and Tan, 1980, 1982; Labitzke, 1982; Wallace and Chang, 1982; Tarasenko, 1988; Holton and Austin, 1991; Dunkerton and Baldwin, 1991; Fedorov et al, 1994; Holton, 1994)
Soukharev: The sunspot cycle, the QBO, and the total ozone over Northeastern Europe van Loon (1988, 1992, 1993), Kodera (1991, 1993), Kodera et al (1991), van Loon and Labitzke (1994), Soukharev (1997a) which were obtained by analysing a possible connection between the meteorological parameters in the winter stratosphere and the sunspot numbers when the data are grouped according to the phases of QBO
Both the running correlations and linear correlation methods con®rm the assumption that the joint eect of the QBO and of the 11-y solar cycle may be an important factor which inuences the interannual variations of total ozone over Northeastern Europe in later winter ± early spring through the changes in stratospheric circulation
Summary
It is well known that the quasi-biennial oscillation (QBO) of zonal winds in the equatorial stratosphere has an inuence on the variability of many meteorological parameters in the stratosphere and troposphere (Holton and Tan, 1980, 1982; Labitzke, 1982; Wallace and Chang, 1982; Tarasenko, 1988; Holton and Austin, 1991; Dunkerton and Baldwin, 1991; Fedorov et al, 1994; Holton, 1994). Many researchers (Angell, 1988; Stolarsky et al, 1991; Aleksandrov et al, 1992; Karol et al, 1992; Khrgian, 1992; Bekorukov et al, 1994) have studied a possible connection between the QBO and interannual variations of ozone. They have showed that, on average, at the i phase of QBO the ozone concentration in the polar latitudes is higher than at the phase. This research is based on the results of Labitzke (1987), Labitzke and
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