Stratospheric Winter Warmings and Planetary Waves in the Atmosphere

In this paper, the atmosphere temperature at (67.5°N, 100°E) and (42.5°N, 100°E) at 10 mb and 0.0827mb levels from the end of 1978 to 1982 is analysed by using NIMBUS-7 SAMS GRID-Tdata. The main features of the stratospheric winter warmings are obtained. It is shown that the temperature increase reached 65Kin a few days at (67.5°N, 100°E) at the 10 mb level in the winter 1978/1979 and the winter of the beginning of 1981. The results of the spectrum analysis of the stratospheric sudden warmings indicate that there exist strong planetary waves with periods of "16-day", 32-day" and "21-day" at high latitudes in winter stratosphere. There are 20K temperature increase at middle latitude during stratospheric winter warming. There exist planetary waves with periods of 16, 8 and 5 days in the mesosphere at middle latitude all the year. The results of the temperature variation with the longitude at different latitudes for both hemispheres are given. It is revealed that the middle atmosphere temperature often varies obviously with the longitude at high latitude in winter, the amplitudes of wave 1 and 2 are large, and they reduce gradually from high latitude to low latitude. It causes the stratospheric winter warmings with amplitudes of wave 1 and 2 increasing sharply in a few days in winter middle atmosphere.