平流层各层温度变化的时空特征分析

利用欧洲中心的ECMWF月平均温度场再分析资料分析了平流层各个层次温度变化的空间分布特征，结果表明1958-2001年全球平流层不同高度温度的变化有一定的差异．在平流层上层2hPa，温度呈显著的下降趋势；平流层中层20hPa温度场低纬度地区和高纬度地区相反变化，低纬度地区呈显著的下降；平流层下层70hPa温度场除了南半球高纬度地区外也呈下降趋势．同时，分析了不同区域温度变化的趋势和周期特征，平流层不同层次温度变化周期有着一定的差异，温度下降区域和温度上升区域的突变时间也有着明显的不同．

Space-time feature analysis of temperature variations in the stratosphere

The spatial distribution characteristics of temperature variations in each stratospheric layer was analyzed through using monthly average temperature data of ECMWF reanalysis. The research result shows that, from 1958 to 2001, the temperature in the higher stratosphere about 2 hPa level decreased remarkably in the whole global; and in the middle stratosphere about 20 hPa level, the temperature in low latitude areas changed opposite to that in high latitude areas and the temperature in low latitude areas decreased evidently; at the same time, the temperature in the lower stratosphere about 70 hPa level showed a decreasing trend except over the high latitude areas of South Hemisphere. Meanwhile, Morlet wavelet analysis was used to analyze the trend and the periodicity of temperature variations in different regions in the stratosphere. The analysis results show that the temperatures in different levels have different periods, and the times of abrupt temperature changes in the temperature-down region are also evidently different from the temperature-up region.