Subtropical countercurrent at the 137°E longitudinal section
Gu Yuhe; Sun Xiangping; Xu Lanying(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071)(First Institute of Oceanography, State Oceanic Administration, Qingdao 266003)
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.
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