| 摘要: |
| 东海北部大陆架上存在着一个较大的冷涡,近十余年来,国内、外的海洋学专家依据多年调查所获得的温、盐度及海流资料对此冷涡进行了分析研究,得出该冷涡终年存在和中心位于32°00′N,126°00′E附近的结论(毛汉礼等,1986;蓝淑芳等,1984)。
夏季,该海域自温跃层所在深度至海底为东海北部底层冷水,苏育嵩等(1989)曾对该水团的形成及其季节变化作了详尽分析。冷水的存在和发展伴随产生反时针的密度环流。另外,冷水的东侧为西北向流动的黄海暖流,西侧为流向东南的黄海沿岸流,两者之间的切变效应以及反时针密度环流的存在是这里形成气旋型冷涡的主要原因。
1980年7月2-6日,中国科学院海洋研究所在东海北部冷涡附近海区布放了浮标阵(Ⅰ，Ⅱ，Ⅲ，Ⅳ站),进行了同步测流,同时在A，Ⅲ，Ⅳ站进行了温、盐度连续观测;随后于7月6-23日又做了大面水文观测。作者引用上述资料进一步分析研究了该海区温、盐度分布特征及水团、海流结构,并重点讨论了冷涡附近海区的涡动混合问题,这对进一步揭示该典型海区的温、盐度逆转現象具有学术意义。调査站位如图1所示。 |
| 关键词: 东海北部冷涡海域、夏季水文结构、涡动混合 |
| DOI： |
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| 基金项目:中国科学院海洋研究所调查研究报告第2499号
本课题为国家自然科学基金资助项目，49176254号 |
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| STUDY ON THE HYDROLOGICAL STRUCTURE AND THE TURBULENT MIXING NEAR THE COLD EDDY SEA AREA IN THE NORTHERN EAST CHINA SEA IN SUMMER |
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Lan Shufang
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Institute of Oceanology,Chinese Academy of Sciences
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| Abstract: |
| Data from July 2-6, 1980 synchronous current observations (with plunging buoy arrays at 4 stations near the northern East China Sea Cold Eddy area ) and from large-scale hydrological observations by the Institute of Oceanology, Chinese Academy of Sciences, were used to analyze the temperature and salinity distribution characteristics, the structures of water masses and currents, and especially the turbulent mixing near the Cold Eddy in the study area.
In light of Ertel’s tensor theory for turbulent exchange, the turbulent exchange coefficient and the turbulent mixing ellipse can be obtained according to the method for calculating the turbulent mixing ellipse. The results indicate that.
1.The turbulent mixings are anisotropic, being stronger in the directions of northwest-southeast, or north-south than northeast-southwest or east-west.
2.During the synchronous observation for three days and nights, the turbulent mixings had the weakening tendency day by day.
3.The rotary angles of the standard ellipse obtained by coordinates transformation rotate clockwise with time.
In light of the variation characteristics of tidal current distribution in the East China Sea, the above mentioned horizontal turbulent mixings primarily reflect the property of tidal mixings. |
| Key words: HYDROLOGICAL STRUCTURE,SUMMER, COLD EDDY SEA AREA,NORTHERN EAST CHINA SEA |
