Climatology of Global Stratopause and Gravity Wave Activity Revealed by SABER/TIMED Temperature Observations
Using 11-year SABER/TIMED temperature observation from January 25,2002,to December 31,2012,we statistically study the global stratopause and the correlations of the stratopause with the gravity waves(GWs)and background zonal wind in the stratopause region.At low latitudes of 0°-30° in the northern and southern hemispheres,the stratopause height and GW activity show semi-annual variation with peaks in summer and winter.In contrast,the stratopause temperature shows semi-annual variation with peaks in spring and autumn.At mid-latitudes of 40°-50° in the two hemispheres,the annual oscillation dominates the variations in the stratopause height,temperature and GW activity,and the peaks of stratopause height and GW activity appear in winter.Still the maximum of the stratopause temperature occurs in summer.Statistical analysis indicates that the stratopaue height positively correlates with GW activity,while the stratopaue temperature is inversely associated with GW activity.The background zonal wind at low latitudes is significant in spring and autumn equinoxes.It shows a positive correlation with the stratopause temperature,but at middle latitudes,it is vital in winter and has an inverse correlation with the stratopause temperature.The correlation coefficients among the stratopause height,temperature,gravity wave(GW)activity,and the background zonal wind exhibit asymmetry between the northern and southern hemispheres.Meanwhile,the peak values of the stratopause height and temperature increase with latitude,while similarly,GW activity and the background zonal wind also increase with latitude,indicating the interaction among the stratopause,GW activity and background wind field.
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