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根据日本气象厅RyofuMaru调查船于 1 972～ 1 977和 1 989～ 1 990年间夏季在 1 55°E断面观测的水文资料 ,分析了该断面上北太平洋副热带海域 ( 1 8°～ 30°N)的主要水文要素———温度、盐度、密度、溶解氧含量和地转流等的分布特征及其与ENSO现象之间的关系。研究结果表明 ,上述诸要素的分布趋势是一致的 ,且与地转流场相对应。动力计算给出 ,在北太平洋副热带海域每年夏季均出现 2或 3支强、次强流或二者兼有的东、西向流动 ,并呈带状相间分布。东向流被称作副热带逆流。根据东、西向流带的数目推论 ,在该海域各年夏季可能存在 2个反气旋涡旋 ,即呈现 2个顺时针次级环流系统。
Based on the hydrological data from the RyofuMaru survey ship at Japan’s Meteorological Agency between 1 972 and 1977 and from 1 989 to 1 990 during the summer section at a 1 55 ° E section, the North Pacific subtropical (18 ° -30 ° N) The main hydrological elements --- temperature, salinity, density, dissolved oxygen content and ground flow and other distribution characteristics and its relationship with the ENSO phenomenon. The results show that the distribution trends of the above elements are consistent and correspond to the geostrophic flow field. Dynamic calculations show that there are 2 or 3 strong and sub-strong currents or both in the North and East subtropical waters flowing east and west every summer with zonal distribution. Eastward flow is called subtropical countercurrent. According to the number of flow belts in the east and west, it is concluded that there may be two anti-cyclonic vortices in the summer of each year in the sea, ie, two clockwise secondary circulation systems are present.