1998年夏、冬季南海水团分析

ANALYSIS ON WATER MASSES IN THE SOUTH CHINA SEA IN SUMMER AND WINTER OF 1998

为了解南海水团的特征和分布 ,基于 1 998年夏季和冬季两个航次的实测资料 ,采用聚类分析、判别分析和模糊分析方法 ,对南海的水团进行了分析。结果表明 ,南海外海水可划分为 6个水团 ,即南海表层水团、南海次表层水团、南海次 中层混合水团、南海中层水团、南海深层水团和南海底盆水。越南附近夏季存在一个暖涡 ;1 998年夏季还可鉴别出黑潮表层水团和黑潮次表层水团 ,但在冬季观测期间无黑潮水越过 1 1 9.5°E经线进入南海 ;这些现象可能与厄尔尼诺现象有关联。夏季有苏禄海海水在 5 0—

The data of cruises in summer and winter in 1998 with regard to the water masses in the South China Sea(SCS) were analyzed with three methods, i.e., clustering method, discrimination method and fuzzy sets method. The water system off shore can be divided into six water masses in SCS: the Surface Water Mass(S), the Subsurface Water Mass (U), the Subsurface Intermediate Mixed Water Mass(UI), the Intermediate Water Mass(I), the Deep Water Mass(D) and the Bottom Basin Water Mass(B). There is a warm eddy in summer near Vietnam. The Kuroshio Surface Water Mass(KS) and Kuroshio Subsurface Water Mass(KU) can be distinguished in summer, but there is no Kuroshio Water entering into the SCS through 119.5°E in winter of 1998. Such a phenomena has probably some relation with E1Ni n o. The Sulu Sea water enters into the SCS at the depth from 50m to 75m through Mindoro Strait in summer.