137°E经向断面上的副热带逆流

Subtropical countercurrent at the 137°E longitudinal section

根据137°E断面1967～1995年间冬、夏两季的温、盐资料，计算和分析了该断面的地转流和副热带逆流．主要结果如下：（1）副热带逆流在冬季和夏季均存在．冬季，副热带逆流出现1支、2支、3支、4支4种形式，夏季出现2支、3支两种形式，两季均以2支形式占优势．（2）冬季副热带逆流主要出现在22°～23°N、26°～27°N两区间；夏季主要出现在21°～22°N、24°～25°N两区间．（3）副热带逆流的流速呈带状结构，多为单束单核，个别为单束双核形式．流速具有更强，冬弱的特点．（4）副热带逆流的流量年际差异较大，多年平均而言，冬季流量为14．3×106m3／s，夏季的为22．9×106m3／s．（5）冬季，副热带逆流的“源地”与黑潮“源地”同为一体．前者是台湾省以东黑潮东侧海流的一个分支，并沿着暖脊、冷槽边缘而东流．

On the basis of the observations of temperature and salinity in the winter and summer of 1967～1995 at 137°E section, geostropica flow is calculated and the Subtropical Countercurrent(SCC)analysed at this section. Main results are as follows:(1) The SCC appears in both winter and summer and exists in the forms of one, two, three or four subbranches in winter and in the forms of two, three subbranches in summer. However, the form of two subbranches dominates in both seasons. (2) The SCC mainly appears between 22°～ 23°N and 26°～ 27°N in winter and between 21°～22°N and 24°～25°N in summer. (3) The velocity of the SCC takes in a band structure, mostly in the form of a single bunch and single core and a very few in the form of a single bunch and double cores. The velocity is strong in summer and weak in winter. (4) The interannual variation Of the volume transport of the SCC is much large. In regard to multi-year mean value, the volume transport is 14. 3×106 m3/s in winter and 22. 9×106 m3/s in summer. (5) In winter, the original area of the SCC is same as that of the Kuroshio and is a branch of the Kuroshio east of Tawain Province, the flowing eastword along the margin of the warm ridge and the cold trough.