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Study on seasonal characteristics of water massesin the western East China Sea shelf area

东海西部陆架区水团的季节性特征研究

投稿时间：2013-11-20 修订日期：2014-06-04

DOI：

Key words:The East China Sea water mass seasonal characteristics the Taiwan Warm Current Water

基金项目:中国科学院创新项目;国家重点基础研究发展计划（973计划）

Author Name	Affiliation	Postcode
Zhang Qilong	Institute of Oceanology,Chinese Academy of Sciences	266071
Liu Hongwei	Institute of Oceanology,Chinese Academy of Sciences
Qin Sisi	Institute of Oceanology,Chinese Academy of Sciences
Yang Dezhou	Institute of Oceanology,Chinese Academy of Sciences
Liu Zhiliang	Institute of Oceanology,Chinese Academy of Sciences

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Abstract:

Based on the CTD data and modeling results in winter and summer of 2009, the seasonal characteristics of the water masses in the western East China Sea shelf area were analyzed using a cluster analysis method and the sources of the Taiwan Warm Current Water in winter and summer were also discussed in this study. The results showed that the distributions and T-S characteristics of the water masses in the study area are of distinct seasonal difference. In the western East China Sea shelf area, there are 3 water masses during winter, i.e., Continental Coastal Water (CCW), Taiwan Warm Current Surface Water (TWCSW) and Yellow Sea Mixing Water (YSMW)，but 4 ones during summer, i.e., the CCW, the TWCSW, Taiwan Warm Current Deep Water (TWCDW) and the YSMW. Of all, the CCW, the TWCSW and the TWCDW are all dominant water masses. The CCW, primarily characterized by low salinity, has lower temperature, higher salinity and smaller spatial extent in winter than in summer. The TWCSW is warmer, fresher and smaller in summer than in winter, and it originates mostly from the Kuroshio Surface Water (KSW) northeast of Taiwan and less from the Taiwan Strait water during winter, but it consists of the strait water and the KSW during summer. The TWCDW is characterized by low temperature and high salinity, and originates completely in the Kuroshio Subsurface Water northeast of Taiwan.

中文摘要:

基于2009年冬季和夏季的CTD数据与模式结果，本文利用聚类分析方法分析了东海陆架区西部水团的季节特征以及冬季和夏季台湾暖流水的来源。结果表明，水团T-S特征和分布存在着明显的季节变化。在东海陆架区的西部海域，冬季存在着三个水团，分别为大陆沿岸水（CCW）、台湾暖流表层水（TWCSW）和黄海混合水（YSMW）；而在夏季存在着四个水团，分别为大陆沿岸水（CCW）、台湾暖流表层水（TWCSW）、台湾暖流深层水（TWCDW）和黄海混合水（YSMW）。其中，在冬季和夏季均存在着大陆沿岸水（CCW）和台湾暖流表层水（TWCSW），这是两个主要的水团，而TWCDW空间幅度很广，也是一个主要的水团。CCW主要特征为低盐，而冬季CCW较夏季CCW温度低，而且空间幅度小，但是，冬季CCW较夏季CCW盐度高。TWCSW在夏季温度较冬季高，盐度较冬季低，但是TWCSW在冬天比在夏天向北延伸远并且深度变大。在冬季，TWCSW大部分源于台湾东北部的黑潮表层水，少部分源于台湾海峡水；而在夏季，它源于台湾海峡水和台湾东北部的黑潮表层水。TWCDW主要表现为低温高盐，全部起源于台湾东北部的黑潮次表层水。

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