摘要
本文引入变性水团概念,用聚类分析确定黄、东海浅海海域变性水团的边界及其变化。根据给定的标准进行聚类,确定了水团的个数、边界及混合区。 由聚类方法所得结果看出,在该海区中有八个变性水团。根据温、盐相对指标,将这些水团分为九种不同的特征。也可以把这些水团划分为三种盐度类型。在温—盐点聚图上,不同变性水团的温盐点,分布于一条曲线附近,它体现出逐级变性的特点。各变性水团的变化范围都很大,这说明该海区中水团变性强烈。在暖季中的增温降盐和冷季中的降温增盐,可认为是整个黄海和东海水体变性的特征。所有季节性水团都经历一个形成与消亡的过程。 文中讨论了变性水团和海洋环境的相互关系。水团变性是热力因素和动力因素共同作用而产生的。通过变性水团的分析,作者认为,在该海区水团的变性中,热力因素起着主要作用。变性水团界线的舌状分布与流向之间的关系是很明显的,可作为分析环流的旁证。最后描述了变性水团和底层中心渔场之间的关系。
The idea of modified water-masses is introduced and a cluster analysis is used for determining the boundary of modified water-masses and its variety in the shallow water area of the Huanghai Sea (Yellow Sea) and the East China Sea. According to the specified standards to make the cluster, we have determined the number and boundary of the water-masses and the mixed zones.The results obtained by the cluster method show that there are eight modified water-masses in this arca. According to the relative index of temperature and salinity, the modified water-masses are divided into nine different characteristic parts. The water-masses may also be divided into three salinity types. On the TS-Diagram, the points concerning temperature and salinity of different modified water-masses are distributed around a curve, from which the characteristic of gradual modification may be embodied. The variation ranges of different modified water-masses are all large, explaining the intensive modification of water-masses in this area.The increase of temperature and the decrease of salinity in warm season and the reversal of them in cold season are regarded as the characteristics of modification of the sea water in all the Huanghai Sea and the East China Sea. All the seasonal water-masses undergo a process of formation and elimination.The correlations of the modified water-masses with the marine environment are discussed in this paper. The modification of water-masses is created by the combinative actions of thermodynamic and dynamic factors.Through the analysis of modified water-masses, we believe that the thermodynamic factors play a major part in the modifieaion of water-masses in this area. The correlations between the tonguelike distribution of the boundary of modified water-masses and the current direction are very apparent, which can be used as a collateral evidence for analyzing circulation. Finally, the relationships between the modified water masses and the central fishing grounds at bottom layer are illustrated.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
1989年第S1期71-85,共15页
Periodical of Ocean University of China
关键词
水团
变性水团
聚类分析
变性回归线
黄海
东海
water mass, modified water mass.clustering analysis, modified regession curve, the Huanghai Sea, the East China Sea.
