摘要
用谐波分析计算得出甘肃各地多年年平均气温变化的谐波方程.其中,年平均气温由南向北递减,随海拔高度的增高而降低;方程描述了各地气候多年变化的情况.最大熵谱和功率谱计算得出甘肃多年年平均气温变化有明显的准两年周期,年平均气温变化有明显的持续性,并且,最大熵谱比功率谱分辨力高.
In this paper,a wave spectral analysis on the secular annual meantemperature in Gansu is made.Results of harmonic analysis show thatthe annual mean temperature decreases with latitude.The annual meantemperature drops with sea level elevation.It's harmonic equations describevery well the climate of different parts in Gansu.The results of calculation of maximum entropy method and of the powerspectral analysis show:a)the evident two-year-quasi-period in secularannual mean temperature,b)the striking persistence in annual meantemperature,c)the resolution and sensitiveness of maximum entropy methodis better than that of power spectral analysis.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1990年第1期103-112,共10页
Journal of Lanzhou University(Natural Sciences)
关键词
气温
变化
谐波分析
功率谱
甘肃
harmonic analysis
power spectrum
variance ratio
resolution
sensitivity
maximum entropy
