文章摘要
刘 浩,许文珊.长江口水域水体结构的季节变化[J].上海海洋大学学报,2013,22(2):260-265
长江口水域水体结构的季节变化
Seasonal variation of the water column in the Estuary of Yangtze River
  
DOI:
中文关键词: 长江冲淡水  层化混合  温度  盐度  长江口水域
英文关键词: Yangtze diluted water  stratification and mixing  temperature  salinity  the Estuary of Yangtze River
基金项目:上海市教育委员会创新项目(12ZZ165);上海海洋大学博士启动基金(B8206070004)
作者单位
刘 浩 上海海洋大学 海洋科学学院 
许文珊 上海海洋大学 海洋科学学院 
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中文摘要:
      通过对比不同季节长江口水域温度和盐度的观测数据,深入分析了该水域温、盐跃层的季节分布特征和变化规律后发现:长江口水域的温度(热)层化现象一般形成于春季,并在夏季最为显著,进入秋季后逐渐减弱,而在冬季该水域的温度在垂直方向基本是均匀分布,显示出较强的垂向热混合过程。另一方面,该水域的盐度分布特征主要受长江冲淡水的影响,因此在长江径流量最大的夏秋季节盐度层化现象最为显著,春季较弱,而冬季在东北季风作用下,长江冲淡水的影响主要局限于沿岸一带,长江口外的盐度垂向混合较为充分。在此基础上对引起水体结构季节变化的动力机制进行了探讨,对于进一步了解主要营养盐和污染物在该海域的分布特征和输运规律具有重要的指导意义。
英文摘要:
      The seasonal variation of water column is investigated by analyzing the observed temperature and salinity in the Yangtze Estuary. It is found that: the temperature stratification comes into being in spring along with the increase of the solar radiation; it becomes enhanced in summer and weakens in autumn, respectively; it vanishes in winter due to the strong vertical mixing mechanism as well as the decrease of solar radiation. On the other hand, the salinity distribution is affected by the runoff of Yangtze River. Therefore, the salinity stratification is the most obvious in summer and autumn, and it is not that apparent in spring. In winter, the northeaster prevails, and the Yangtze diluted water is confined to the coast, so the salinity is well mixed in the vertical. Furthermore, the dynamic mechanisms governing the seasonal variation of the water column are discussed. The above knowledge is essential for better understanding the distribution and transport of main nutrients and pollutants in the Yangtze Estuary.
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