机构地区: 中国科学院测量与地球物理研究所
出 处: 《地球物理学报》 2003年第1期36-41,共6页
摘 要: 用连续小波变换方法 ,对中国近海验潮站资料 ( 2 0~ 30a)和Topex/Poseidon卫星测高海平面变化资料 ( 1992年 10月~ 1998年 9月 )进行分析 ,给出了南海、黄海和东海海平面变化在季节尺度上的时频特征 .结果表明 ,黄海和东海的海平面变化较相似 ,存在显著的周年和准双月的振荡信号 ;南海具有较明显的周年信号和较弱的半年周期信号 ;浅海区和深海区的海平面季节尺度变化在周期性与强度上存在明显差异 . The fast Fourier Transform (FFT) and the Continuous Wavelet Transform (CWT) are used to analyze the basic features of inter-seasonal variations of the sea level in China Seas from tide gauge records and Topex/Poseidon altimetry data (from October of 1992 to September of 1998). The results indicate that the sea level variations over the Yellow Sea and the East China Sea are similar, which have two strong oscillatory signals with the periods of annual and about 60 days, annual and semiannual signals are prominent in the South China Sea. The sea level variations show significant differences at inter-seasonal scales between shallow sea and deep-sea.
关 键 词: 小波变换 海平面变化 中国近海 卫星测高 验潮站
领 域: [天文地球]