北太平洋副热带逆流区海流的准90天振荡  

Quasi 90-Day Oscillation of the Current in the Area of Subtropical Countercurrent in the North Pacific

作　　者：潘爱军[1] 刘秦玉[1] 胡瑞金[1] 王韶霞[1] 

机构地区：[1]青岛海洋大学物理海洋教育部重点实验室,青岛266003

出　　处：《青岛海洋大学学报（自然科学版）》2002年第1期18-24,共7页Journal of Ocean University of Qingdao

基　　金：国家自然科学基金课题 (4 9776 2 86和 49976 0 0 4)资助

摘　　要：根据 POCM模式输出的流场资料 (1993年 1月 1日～ 1998年 12月 31日 ) ,运用小波分析方法分析北太平洋副热带逆流区海流的季节内振荡特征 ,并用功率谱方法作了验证。结果表明 :在以 19.81°N为中心 ,18～ 2 2°N,16 0°E以西的西太平洋海域 ,海流具有显著的准 90 d振荡特征 ;该振荡对应的波长约为 86 5 km,沿 19.81°N该振荡信号自东向西传播的相速度约为 0 .0 9m/ s。从能量角度看 ,该振荡信号主要存在于 15 0 m以内的海洋次表层 ,2 2 2 .5 m深度能量是 6 2 .5 m能量的13%。The intraseasonal current oscillation in the area of Subtropical Countercurrent in the North Pacific was analyzed with the data from POCM output (January 1, 1993～December 31, 1998) and compared with the results of the Spectrum Analysis. The results showed that the current has a distinct quasi 90-day oscillation character in the northwest pacific centered at 19.81°N, within 18°N～22°N and west of 160°E. The wavelength is around 865km. It propagates westward along 20°N with a phase speed of 0.09m/s. From the point of view of energy, quasi 90-day oscillation signal locates mainly in the upper 150m and it spins down while propagating downward. The energy at 222.5m is only 13% of that at 12.5m.

关 键 词：海流 准90天振荡 副热带逆流 小波分析 谱分析 能量衰减 北太平洋 POCM模式 

分 类 号：P731.21[天文地球—海洋科学] P732