摘要
通过比较傅里叶分析和小波分析中能量守恒公式，提出了小波能量谱的概念。对一个复合的试验序列做比较分析，显示出小波能量谱具有直观地反映振动强度随频率和时间变化的优良性能，特别是对ｃｏｓ（ω２ｔ）ｃｏｓ（ω１ｔ）型的变化。应用于热带太平洋海表温度异常分析，得到它的年际变率主要由２年、４年和１年的振动组成，间隔１０年左右同期增强或减弱为时间演变的主要特征。
The conception of wavelet energy spectrum (WES) is posed by comparing the conservation of total energy in harmonic analysis,power spectrum analysis and wavelet transform. The calculations of a compound test series show that the WES has a fine performance in audiovisually revealing the time changes of strength of fluctuations in both time and frequency domains,especially for time changes of cos ω 2t × cos ω 1t type. The WES analysis of SSTA series in the tropical Pacific suggests that its interannual variability is primarily composed of biennial,quadrennial and annual oscillations,and these components simultaneously strengthen or weaken in a time interval about 10 years.
出处
《南京气象学院学报》
CSCD
1997年第3期301-307,共7页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金
