摘要
本文用复经验正交函数(CEOF)分析方法,研究了1899～1980年北太平洋冬季海平面气压场的时空结构,指出北太平洋中部的高、低纬度地区分别为二个半永久性大气活动中心(阿留申低压和副热带高压)。并指出该地区的空间波是一行波,其传播方向是自西北向东南的准纬向方向,且高低纬度地区气压距平变化是反位相关系。 采用多维谱分析方法,探讨了各季节的南方涛动指数(SOI)与气压场的振荡特性,结果表明它们之间存在准3.5年的耦合振荡,且以南方涛动变化超前气压场为主要特点,冬季更为显著。
Using the Complex Emperieal Orthogonal Function(CEOF) technique, the temporal and spatial structures on tne winter sea-level pressure (1899 ~1980) on the Northern Pacific have been analyzed in this paper.It is obvious that the doninat feature might be the existence of two quasi-permanent atmospheric active centers (the Alutian Low and the Tropical Pacific High) over this area. The second feature might be the spatial wave which appears as a progressive wave in the area. The direction of the wave movment approximated from northwest to southeast. The third one might be the opposive sign existed between the abnormals of sea-level pressure over the high and the low latitute areas.
The relationship between the seasonal Southern Oscillation Index (SOI) and sea-level pressure has been analyzed using the multi-spectral method. As a result, the coupling oscillation with 3.5 years could be a major characteristic. The SOI seemed to represent a lead variation before the pressure field. Especially, it could be more obvious in winter.
出处
《海洋预报》
北大核心
1990年第1期1-7,共7页
Marine Forecasts
