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根据 1998年夏季和冬季 2个航次的实测资料 ,对南海的水团进行划分和分析 ,并利用1997年 7月和 12月的实测资料 ,对巴士海峡 (吕宋海峡 )和民都洛水道附近的温盐分布进行分析。1998年冬季的资料分析结果表明 ,可将南海外海水划分为 6个水团 ,即南海表层水团 (S)、南海次表层水团 (U)、南海次 -中层混合水团 (UI)、南海中层水团 (I)、南海深层水团 (D)和南海底盆水(B)。 1998年夏季还可在南海中鉴别出黑潮表层水团 (KS)和黑潮次表层水团 (KU) ,但在冬季观测期间无黑潮水越过 119.5°E经线进入南海 ;夏季有苏禄海水在 5 0～ 75 m层经民都洛水道侵入南海。然而 ,1997年夏季和冬季的资料分析表明 :夏、冬两季都有大洋水通过吕宋海峡北段进入南海 ,南段有南海水流入太平洋。这些现象可能与 1998年前后的厄尔尼诺有关。
According to the measured data of 2 voyages in summer and winter of 1998, the water masses of the South China Sea are divided and analyzed. Based on the measured data of July and December 1997, the water quality of the Bashi Channel (Luzon Strait) Temperature and salt distribution for analysis. Data analysis of the winter of 1998 shows that the seawater can be divided into six water masses, namely the South China Sea surface water mass (S), the South China Sea sub-surface water mass (U), the South China Sea sub-middle mixed water mass (UI) South China Sea middle water mass (I), South China Sea deep water mass (D) and South China Sea basin water (B). In the summer of 1998, Kuroshio surface water mass (KS) and Kuroshio sub-surface water mass (KU) were also identified in the South China Sea. However, during the winter observation period, no Kuroshio water entered the South China Sea beyond the 119.5 ° E longitude line. In the summer there was Sulu seawater In the 50 ~ 75 m layer by the Mindoro waterways invaded the South China Sea. However, data analysis for summer and winter of 1997 shows that ocean water enters the South China Sea through the northern section of the Luzon Strait in both summer and winter, and South China Sea flows into the Pacific Ocean in the southern section. These phenomena may be related to El Niño around 1998.