中文摘要：

利用NCEP／NCAR再分析资料，结合HAEOE的臭氧和甲烷卫星观测资料，分析100～50hPa的平流层下部温度变率及其与微量气体和平均纬向风的关系。结果表明，全球平流层下部大气温度自1948年至今总体呈下降趋势，而近十几年，全球平流层下部温度下降更加显著。热带和低纬甲烷的增长可能是其降温的一个重要原因。此外，由于平流层下部温度变率的经向不均匀性，同时还会引起该地区平均纬向风的变化。

英文摘要：

NCEP/NCAR reanalysis data and ozone and methane data of HALOE are used to study the lowerstratospheric （100 to 50 hPa） temperature trends and its relations to tracers likes ozone and methane and the mean zonal wind. The results indicate that the global temperature in the lower stratosphere trends to decrease since 1948, and the phenomenon is severer during recent ten or more years; the increase of the lower-stratospheric methane over tropics and lower latitudes may be a great cause for the temperature trends; besides, the difference of temperature variability between different zonal belts may modify the mean zonal wind.