北半球中纬度地区大气折射指数多年时空振荡研究

STUDY OF LONG-TEKM SPACE-TIME OSCILLATION OF NORTHERN MIDLATITUDE ATMOSPHERIC REFRACTIVE INDEX

用时－空谱分析方法分析了３２．５°Ｎ纬圈上的１９８０～１９８３年逐日大气折射指数Ｎ单位的变化。结果表明：大气折射指数的变化主要受东进的纬向移动的天气系统影响，主要体现在中、长周期上。此外，地理环境主要影响气候区域的分布。

The space- time spectral analysis is adopted to explore the variation in the 1980～1983 daily atmospheric refractive index N at 32.5°N. Results show that the index variation isdependent largely upon the eastward-moving weather system and displayed on a medium-andlong-range basis.Further,geographic influence is great,responsible for the distribution of cli-matic regions.