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Journal of the Meteorological Society of Japan
Interannual vartability of the Northern Hemisphere polar vortex at the 30mb during 21 winter seasons is examined making use of two indices which may be viewed as measures of the intensity of the vortex. The signature of stratospheric warmings is clearly evident in time series of the indices, but these events account for only part of the interannual variability. Alleged relationships between the intensity of the wintertime stratospheric polar vortex and the phase of the equatorial stratosphericdoi:10.2151/jmsj1965.60.1_149 fatcat:45pxsiixu5ebphgffgvgula6fe