A Possible Influence of the Polar Night Stratospheric Jet on the Subtropical Tropospheric Jet

Abstract
According to Nigam (1990), the first mode of his EOF analysis mainly represents variabilities in the zonal-mean zonal wind related to the displacement of the tropospheric subtropical jet. The present results of a lagged correlation analysis reveal that perturbations in zonal-mean zonal winds first occur in the stratosphere and then propagate into the subtropical troposphere. Numerical experiments with a general circulation model also indicate that the initial perturbations in the stratosphere can cause appreciable changes in the subtropical tropospheric jet.