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nan hai zhong bu ne-sw xiang duan mian hai shui re yan jie gou yi ji hai pen leng shui lai yuan de fen xi
Pages: 411-418
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  热盐结构南海中部南海海盆位温底层水巴士海峡调查船盐度分布西北太平洋溶解氧;
Abstract: The article mainly contains four parts. (1) Investigations of! the coldest temp erature of the water in South China Sea Basin (SCSB) since the late 1920's are briefly reviewed; (2) Based on the data of NE-SW section collected from R/V Rehoboth in winter of 1965-1966, the thermohaline structure, especially for the deep-bottom water is analyzed; (3) Comparison of data of temperature, salinity and oxygen content between the station of Dana cruise (St. 3714, May, 1929) and the neighbouring stations of Rehoboth cruise (St. 11 and St. 9, winter, 1965-1966) (see Table 1) shows that, in spite of the time gap of more than 36 years, the temperature and salinity of the deep-bottom water remain almost unchanged, but the oxygen contents increase evidently, especially at 1750-2000 m depth, evidencing the existence of renewal phenomenon of deep-bottom water in SCSB; (4) -S relation for station in central SCS (St. 9, 16°00′N, 116°01′E, Feb. 4, 1966, Rehoboth) is compared with that for station in western North Pacific (WNP) (St. 65069, 19°31′N, 127°01′E, Aug. 19, 1965, Takuyo). It is shown that 6-S relation for SCSB water at 1500-4000 m depth is very similar to that for WNP deep water at 1500-2000m depth, but quite different from that for WNP deep water at 2500-4000 m depth. It clearly demonstrates that the deep-bottom water in SCSB is originated from the deep water in WNP, and that the characteristic depth is largely determined by the sill depth of Bashi Strait and by the mixing process between the deep water of WNP and the surrounding water in SCS.
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