热带太平洋海区混沌特征分析  

Analysis of the Chaotic Characteristics of the Tropical Pacific Ocean

作　　者：姜华[1] 吴德星[1] 

机构地区：[1]青岛海洋大学物理海洋研究所,物理海洋实验室青岛266003

出　　处：《青岛海洋大学学报（自然科学版）》2001年第1期1-6,共6页Journal of Ocean University of Qingdao

基　　金：国家自然科学基金课题!(4 9876 0 11);高等学校博士学科点专项科研基金课题!(980 42 30 1)

摘　　要：基于 TOGA- TAO锚定于热带太平洋海区的 53个浮标站 1994年冬季海表温度 ( SST)资料 ,采用多种分析非线性动力系统的方法。如谱分析 ,相空间重构法等 ,以及计算描述混沌行为的重要指标 ,如分维数、L yapunov指数等 ,对热带太平洋是否存在混沌现象进行判别分析。发现在热带太平洋 130°W至 12 0°W之间存在强混沌区 ,在西边界附近也存在混沌区。但通过吸引子的相型可以看出热带东太平洋与西太平洋是不同性质的非线性动力系统 ,导致系统出现混沌现象的原因可能是不同的。Based on TOGA-TAO data and the methods for studying nonlinear dynamical systems power spectrum, state space reconstruction, calculation of Lyapunov exponents and fractal dimensions, the ocean chaotic characteristics of the tropical Pacific ocean is extensively studied in this paper. It is found that the underlying system of the eastern and western Pacific is always chaotic and a strong chaotic region exists in the eastern Pacific ocean between 130°W^120°W. The largest Lyapunov exponent is about 9.39618E-04h -1 in the eastern Pacific ocean and 6.561212E-04h -1 in the western Pacific ocean. The Fractal dimension is 4.3414±0.02 in the easern Pacific ocean and 4.3241±0.02 in the western Pacific ocean. The difference between the characteristics of chaotic attractors existing in the eastern and western tropical Pacific ocean shows that the reason for the chaos present in the two regions may be different.

关 键 词：热带太平洋 混沌 LYAPUNOV指数 关联维 海表温度 海洋环流 

分 类 号：P731.2[天文地球—海洋科学]