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引用本文:曹振轶,鲍敏,管卫兵,陈琪.北部湾东北部水团分布及季节变化分析.海洋与湖沼,2019,50(3):532-542.
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北部湾东北部水团分布及季节变化分析
曹振轶1, 鲍敏1, 管卫兵1,2, 陈琪1
1.卫星海洋环境动力学国家重点实验室 自然资源部第二海洋研究所 杭州 310012;2.浙江大学 海洋学院 舟山 316021
摘要:
基于2016年9月-2017年8月北部湾海域棕囊藻调查9个航次的温度、盐度和密度等水文数据,通过K-mean动态聚类分析方法分析了研究海域水团的分布及季节变化过程。根据温盐资料将研究海域的海水类型分为低温高盐的陆架底层水团、陆架表层混合水团和低盐沿岸水团。通过20°10'N断面上多期次的温盐分布特征揭示了北部湾整体上逆时针环流在北部湾东侧陆坡的存在;通过大面水文调查的结果揭示琼州海峡的余流特征,并结合卫星漂流浮标运动轨迹揭示了珠江冲淡水对研究海区水团分布的影响。本研究丰富了对北部湾东北部水团分布和季节变化的认知,对研究该海域赤潮发生、发展规律有指导意义。
关键词:  北部湾  温盐分布  水团  环流
DOI:10.11693/hyhz20190100007
分类号:P731
基金项目:国家重点研发计划项目,2017YFC1404300号;中国科学院战略性先导科技专项专题,XDA11020304号;全球变化与海气相互作用专项,GASI-IPOVAI-04号;卫星海洋环境动力学国家重点实验室自主项目,SOEDZZ1805号,SOEDZZ1802号
WATER-MASS EVOLUTION AND THE SEASONAL CHANGE IN NORTHEAST OF THE BEIBU GULF, CHINA
CAO Zhen-Yi1, BAO Min1, GUAN Wei-Bing1,2, CHEN Qi1
1.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;2.Ocean College, Zhejiang University, Zhoushan 316021, China
Abstract:
Hydrological data were collected in nine field surveys in the Beibu Gulf, Guangxi, South China between September in 2016 and August in 2017, in which temperature, salinity, and density data were measured. The K-mean dynamic clustering method was applied to study the water mass distribution and evolution. According to the different sources of water, seawater were classified into three types, i.e., the bottom mixed shelf water with low temperature and high salinity, the surface mixed shelf water, and the coastal water with low salinity. An anticlockwise circulation was confirmed along the 20°10'N section in the eastern slope of Beibu Gulf as shown by hydrological data, and so did the residual current in the Qiongzhou Strait. In addition, with the help of satellite tracking surface drifters, the impact of the Zhujiang (Pearl) River diluted water on the study region was revealed. This research enriched the understanding of the distribution and seasonal variation of water masses in the northeastern Beibu Gulf. It was instructive to study the occurrence and development of red tide in this area.
Key words:  the Beibu Gulf  distribution of temperature and salinity  water mass  circulation
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