Vol. 21, issue 10, article # 8

Dyukarev E. A., Ippolitov I. I., Kabanov M. V., Loginov S. V. Variability of subtropical jet stream in the troposphere of the Northern Hemisphere in the second half of XX century. // Atmospheric and oceanic optics. 2008. V. 21. No. 10. P. 755-760. PDF
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Abstract:

The spatiotemporal variability of the subtropical jet stream (SJS) speed was studied using NCAR/NCEP reanalysis data for 1948-2005. The subtropical jet stream manifests itself as the leading flow of the west-east circulation in the troposphere of the Northern Hemisphere. The speed of the SJS is shown to increase in the cold period of a year by 1 m/s per 10 years. Some meaningful tendencies in changes of latitude and height of the position of SJS axis were not revealed. Correlations of time series of the stream velocity and the series of indices of the North Atlantic and South Oscillations, Wolf numbers, and Earth angular rotation velocity were considered. The effect of the North Atlantic Oscillation on the SJS speed is significant in October–December, of the South Oscillation – in January–April. Negative correlation was found between the Earth angular rotation velocity and the jet speed for summer months. It is shown that the closeness of the correlation increases if not initial series are considered, but their wavelet spectra.

Keywords:

atmospheric circulation, jet stream, change of climate, wavelet analysis