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大亚湾及其邻近海域冬季温度、盐度的分布及日变化特征
郑哲昊,庄伟,孙振宇,陈照章,朱佳,梁浩亮
0
(1.厦门大学近海海洋环境科学国家重点实验室,福建 厦门 361102;2.惠州市海洋技术中心,广东 惠州 516000)
摘要:
根据2018年1月冬季航次的水文实测资料,详细分析了大亚湾海水温度(T)、盐度(S)的分布特征。整体而言,观测海区海表相对于海底具有高温低盐的特征;同时,无论是表层还是近底层,大亚湾湾内的海水相对于湾外都呈现高温低盐的特征。观测期间,应是受到大亚湾核电站温排水的影响,湾内西侧存在一个高温中心。盐度的差异在近底层更加明显,低盐中心位于大亚湾的湾顶和大亚湾的中部海域,而高盐中心则主要分布于湾口西侧及惠东以东附近海域。太阳辐射和潮流变化是影响大亚湾温度、盐度变化的两大重要因素。其中,太阳辐射的影响主要局限于表层3~4 m,对近底层海水的影响较小;其加热效应使湾内和湾口附近的表层海水都表现出明显的昼夜变化。由潮汐和温度、盐度的对应关系可知,潮流对湾内温度、盐度的影响较大,而对湾外温度、盐度的影响较小。
关键词:  海洋水文学  温度  盐度  冬季  大亚湾
DOI:
基金项目:国家自然科学基金资助项目(41776027);惠州市2017年市级统筹油补资金资助项目(F2017-01-1)
Distributions and diurnal variations of temperature and salinity in Daya Bay and its adjacent waters in winter
ZHENG Zhe-hao,ZHUANG Wei,SUN Zhen-yu,CHEN Zhao-zhang,ZHU Jia,LIANG Hao-liang
(1.State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China; 2.Huizhou Marine Technology Center, Huizhou 516000, China)
Abstract:
Based on the hydrographic data measured in January 2018, the characteristics of temperature and salinity in Daya Bay were analyzed in detail. The results show that the sea surface is generally characterized by higher temperature and lower salinity compared to the near bottom. Meanwhile, both in the sea surface and the near bottom layers, the sea water inside Daya Bay is characterized by higher temperature and lower salinity compared with that outside the bay. During the observational period, there existed a high temperature center on the west side of the bay, which should be affected by the warm water discharge from Daya Bay nuclear power plant. The difference in salinity is more obvious near the bottom. One low salinity center is located in the bay head area and the other lowsalinity center is located in the bay center, while the high salinity center is mainly located near the west sides of the bay mouth and the eastern Huidong coast. Solar radiation and tidal current are two important factors influencing the evolution of temperature and salinity in Daya Bay. The effect of solar radiation is mainly limited to the upper 3-4m water layer, and it is weaker on the nearbottom seawater. The heating causes significant diurnal variations of surface water both inside and near the mouth of the bay. The relations of tide to temperature and salinity show that the tide has a significant influence on the temperature and salinity inside the bay, but less influence outside the bay.
Key words:  marine hydrography  temperature  salinity  winter  Daya Bay

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