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用美国海军高分辨率气候月平均温盐资料和等位势密度面P-矢量方法,计算了西北太平洋各月等位势密度面环流.主要讨论西北太平洋副热带流涡内部东向副热带逆流(简称:STCC)的空间分布、垂直结构、体积输送及其附近的涡旋现象.计算结果很好地再现了STCC的一些观测特征,并且还揭示了STCC在等位势密度面上呈现的一些新现象:(1)在24.6 σθ面上,STCC的空间分布、源地和流动态势都有很强的季节变化,1-3月份不存在STCC;(2)5-10月,日本以南黑潮逆流的一个分支汇入了STCC,使得STCC的流速增强,流幅显著地加宽;(3)流速矢量场明显地表现出:STCC和它附近的一些涡旋伴随而生,STCC存在时它附近总伴随着一些涡旋,当STCC消失时涡旋也就消失了;(4)通过137.5°E断面,STCC的输送量夏季最强,8月份最大输送量达6.9 Sv(1 Sv三106m3/s),春、秋季较弱,4和11月份的输送量分别为1.7和1.6 Sv,输送主要集中在24.0≤σθ≤25.0面之间;(5)纬向流沿137.5°E断面的分布表明,STCC的流核位于24.3-24.7σθ之间.
Using the monthly mean temperature and salinity data of the United States Navy’s high-resolution climate and the P-vector method of the equipotential density surface, the monthly circulation of the equipotential density surface in the northwestern Pacific Ocean was calculated. : STCC) in the spatial distribution, vertical structure, volumetric transport and its nearby vortex phenomenon.The calculated results well reproduce some observed features of STCC, and also reveal some new phenomena of STCC on the surface of equipotential density (1) There is a strong seasonal variation of spatial distribution, source and flow of STCC on the 24.6 σθ plane without STCC in January-March; (2) From May to October, the Kuroshio current south of Japan (3) The velocity vector field clearly shows that some of the vortices in the STCC and its vicinity are accompanied by the presence of STCC in the vicinity of it With some eddies, the vortex will disappear when the STCC disappears. (4) Through the 137.5 ° E section, the STCC delivers the strongest in summer and the maximum delivery in August reaches 6.9 Sv (1 Sv and 3 106 m 3 / s) , Spring and autumn is weaker, and the deliveries in April and November are 1.7 and 1.6 Sv, respectively In between the surface 24.0≤σθ≤25.0; (5) along the widthwise flow distribution 137.5 ° E show cross section, STCC core positioned between the flow 24.3-24.7σθ.