Interannual variations and trends in zonal mean series of total ozone, temperature, and zonal wind |
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| Authors: | K N Visheratin |
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| Institution: | (1) NPO Taifun, pr. Lenina 82, Obninsk, Kaluga oblast, 249038, Russia |
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| Abstract: | The paper considers zonal mean (65° S–65° N, with a step of 5°) monthly mean NCEP/DOE reanalysis data on zonal wind and temperature at levels of 20 to 100 mb and the TOMS data of version 8 on total ozone (TO) for the period 1979–2005. The results of calculating linear-trend coefficients, correlation coefficients, and characteristic decay times and the data of spectral analysis are presented. In recent decades, the decrease in TO and the cooling of the lower stratosphere were accompanied by a weakening of the westerly wind. For deseasonalized series, the significance of their linear trends are evaluated with the use of the Monte Carlo method and it is shown that TO trends are significant at a level of 0.99 in extratropical latitudinal zones and that temperature trends are significant everywhere except in a narrow equatorial zone and in latitudes south of 50° S, whereas wind trends are significant only at a 50-mb level in the latitudinal belt 30°–50° in both hemispheres. According to the results of spectral analysis, for the majority of latitudinal zones, a triplet in the range of quasibiennial oscillations and oscillations with periods of about 4–6 and 9–13 years manifest themselves most persistently in the series of temperature, wind, and TO. Maximum correlation coefficients of the series of TO, wind, and temperature are observed over the equator, and, depending on altitude and latitude, TO variations may lag or lead temperature and wind variations in phase. Latitudinal distributions of characteristic decay times show an increase in this parameter in tropical and equatorial zones and its opposite behavior with altitude for temperature and wind fields. |
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