摘要
本文利用近代物理学中提出的分析方法,对ENSO事件在相空间中的轨迹特征进行了描述。主要是将(1)赤道东太平洋nino-3区中,2.5°S、125°W处的1958—1972年海温月距平;(2)1949—1983年南方涛动指数(复活节岛海平面气压减去达尔文站海平面气压的差)的时间序列资料进行了相空间拓展。计算了吸引子关联函数C(r),进一步确定了吸引子的维数,分别为d_E=3.1、d_s=3.2,具有分维结构,故为奇怪吸引子,从而得知ENSO事件为一混沌现象。因此,为了支撑这样的奇怪吸引子,至少需要由四阶确定性的非线性微分方程(或者说,需要由四个相变量)才能对ENSO事件进行描述。
In this paper, by using the method provided in modern physics, the time series data of ENSO evidence are expanded in phase space. The data include: (1) SSTA at 2.5°S, 120°W in the equatorial East pacific during the 1958—1972 period and (2) SOI during the 1949—1983 period. The correlation of the attractors is calculated and the dimension determined, being d_E=3.1 and ds=3.2 respectively, so that the ENSO events possess strange attractors. As a result, they should be described by at least employing 4 order ordinary differential equations for holding the strange sttractor.
出处
《南京气象学院学报》
CSCD
1990年第2期167-173,共7页
Journal of Nanjing Institute of Meteorology
