中文摘要：

利用1991年10月到2005年11月的HALOE卫星观测资料，对全球70°S～70°N范围内平流层100hPa到1hPa的大气CH4混合比进行了时空特征分析．结果表明：①CH4混合比在平流层是随高度上升而逐渐减小的．平流层中上层CH4变化存在年循环，而平流层中下层CH4变化存在半年振荡（SAO），且南半球平流层CH4的季节变化振幅要大于北半球，特别是平流层中上层．平流层各个高度上的CH4基本呈纬向分布，但是不同高度上分布特征有所差异；②平流层CH4混合比变化存在3个月，10个月，准25个月和准45个月左右时间尺度的周期，但是3个月的短期变化和10个月的年循环只在1996年之前明显；③不同高度上，CH4和O3变化的相关关系是不同的，CH4对O3的破坏作用并不是存在于整个平流层，似乎是在有的高度上相关关系明显，有的高度上相关关系不明显．

英文摘要：

The methane data observed by HALOE in UARS satellite from October 1991 to November 2005 are used to analyze the temporal and spatial features of stratospheric methane covering 70°S--70°N, 1 80° W--180°E. The results show that： ① the methane mixing ratio decreases with altitude in the stratosphere. The methane mixing ratio variation contains the annual cycle in the middle and upper stratosphere and the semiannual cycle in the lower stratosphere. And the amplitude of monthly variability in the southern hemisphere is larger than that in the northern hemisphere, especially at the middle upper stratosphere. The methane mixing ratio in low latitudes is larger than that in high latitudes, and is nearly symmetric on either side of the equator, but the distribution features are different at different heights;② The methane mixing ratio change has 3- month, 10-month,quasi-25-month and quasi-45-month oscillations, while 3-month and 10-month oscil- lations are obvious before 1996;③ The relationship between the methane mixing ratio and the ozone mixing ratio is different at different layers. The photochemical destruction effect of the methane to the ozone dose not exist in the whole stratosphere,it seems that the correlation is obvious at some layers, but not obvious at other layers.