水团分析是海洋研究中的一个重要方面。但是,对于浅海、特别是中纬度上的陆架海,海水结构的季节性变化强烈,因此,通常定义于大洋中的“水团”概念,但用于浅海就不够确切。于是,许多中、日学者在分析我国黄、东海的水体结构时常常避免采用“水团”一词,而以“水系”(或简称“水”)代之。本文亦将采用水系这一名称。我们的理解是:水系是指流入浅海或在浅海的某一确定区域内形成的水体,它具有独特的,在不同季节相对地说尚且稳定的理化特征,这些特征应是连续分布的,随季节的变化趋向应是一致的,并作为一 Water mass analysis is an important aspect of marine research. However, seasonal changes in the structure of seawater strongly affect the shallow sea, especially the mid-latitude shelf waters, and therefore generally define the concept of “water mass” in the oceans, but not enough for shallow seas. Therefore, many Chinese and Japanese scholars often refrain from using the term “water mass” instead of “water system” (or simply “water”) when analyzing the water bodies in the Yellow Sea and East China Sea. This article will also use the name water system. It is our understanding that water system refers to a body of water that flows into shallow sea or in a defined area of ​​shallow sea and has a unique physical and chemical characteristics that are relatively stable and stable in different seasons. These characteristics should be continuously distributed, The trend of change should be consistent, and as one