摘要
本文利用离散功率谱、周期图分析方法对上海地区1873—1972年6月上旬百年的旬平均大气折射指数N单位多频振动进行了分析,结果发现:在α为0.05显著性水平条件下,百年中大气折射指数N单位值最主要振动周期为45—50年和20年。经高通滤波后,又突出了准两年的振动周期。
Iu this paper the discrete power spectrum and periodogram are used to ana-IYZe the N-Unit value multi-frequency oscillations of the mean ten-day of atmospheric refraction index in shanghai for the first ten day of June from 1873 To 1972. It is found that the main oscillation for the N-unit value has a cycle of 45-50 Years and 20 Years, when the level of significance a equals 0.05, and the cycle of quasi-biennial oscillation is highlight while the high-pass filter is applied.
出处
《气象科学》
CSCD
北大核心
1990年第3期273-279,共7页
Journal of the Meteorological Sciences
