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根据1992年3月和1994年9月台湾海峡两岸科学家对南海北部两次协同调查的CTD资料以及由此计算的重力势资料，对吕宋海峡及南海北部400m以上海水的温盐性质进行分析。结果发现，调查海区基本可划分为两种水团，即黑潮水和南海水。黑潮水主要从吕宋海峡中部和北部进入南海，侵入的黑潮水向西北方向扩展，受到台湾海峡海底地形的阻挡而大部分集中于台湾西南海域，向西的范围基本不超过119°E。虽然两次观测所处的季节不同（分别为春初和夏末），但黑潮入侵南海的差异并不明显。另外，在二次调查的部分层次上，南海北部陆坡边缘都发现有一团水平尺度约百公里的黑潮性质水。配合重力势的水平分布形式，可以用地转流场的结构解释水团分析的结果。
Based on the CTD data of the two co-located surveys conducted by the two sides of the Taiwan Strait in March 1992 and September 1994 in the northern South China Sea and the gravitational potential data calculated from the data, the temperature and salinity characteristics of the seawater above 400m in the Luzon Strait and the northern South China Sea were analyzed. The result shows that the sea area under investigation can be divided into two kinds of water masses: the Kuroshio and the South China Sea. Kuroshio mainly enters the South China Sea from the central and northern Luzon Strait, and the intruded Kuroshio water expands northwestward. Most of the Kuroshio water is blocked by the sea bottom of the Taiwan Strait and concentrated in the southwest of Taiwan. Its westward extent basically does not exceed 119 ° E. Although the two observational periods are different (early spring and late summer, respectively), the difference between the invasion of the South China Sea by the Kuroshio was not obvious. In addition, at a part of the second survey, a group of Kuroshio water of about 100 km in horizontal scale was found on the edge of the northern slope of the South China Sea. According to the horizontal distribution of the gravitational potential, the structure of the flow field can be used to explain the result of the water mass analysis.