| 摘要: |
| 东海北部是几个流系交汇的地方，东有黄海暖流向西北流人黄海，西有所谓黄海沿岸流南下，南有黑潮北上余脉；另外，在夏季，上层还有长江冲淡水的影响(见图1)。因此，这里的水文状况相当复杂，曾引起了不少中外学者的注意。井上尚文根据1969年11月在该海区投放的海底漂流器资料分析的结果表明，济州岛西南海域的底层流，在秋、冬两季为一范围相当大的反时针水平环流。胡敦欣等进一步指出，夏季在大约以31°30’N，125°30'E为中心，尺度为100-200km 的范围内存在着一个气旋型涡旋；阐明了这一涡旋形成的动力原因(黄海暖流、黄海沿岸流和黑潮北上余脉之间的相互作用)和热力学因子(黄海冷水的南伸)；对这一海区海底圆形软泥沉积的形成机制作了简要的说明，并依此推测这一涡旋的常年存在。近几年来，我们又作过多次专题性调查，取得了较好的资料。本文旨在进一步论证这一涡旋的常年存在，阐明其多年变化，探讨引起这种变化的原因，并讨论几个有关的问题。 |
| 关键词: 气旋型涡旋 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第1251号 |
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| A CYCLONIC EDDY IN THE NORTHERN EAST CHINA SEA |
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Mao Hanli, Hu Dunxin, Zhao Baoren, Ding zongxin
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Institute of Oceanology, Academia Sinica
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| Abstract: |
| A cyclonic mesoscale eddy located about 150 km southwest of Cheju Islanl, the scales of which are 100-200 km horizontally and 50 m vertically, is reexamined with current measurements. The year round and multiyear existence of the eddy has been identified with thermal structure and current measurements. Interannual flucturation of the eddy in summer is discussed in somewhat detail in terms of closed isotherms at various levels. The observed current data in 1972’s summer agree well with computed geostrophic flow, i.e. they both show the existence of the cyclonic eddy with cold and saline water in the central area. It is reasoned that the formation of the eddy is closely correlated to the interaction of the Yellow Sea Warm Current, Yellow Sea Coastal Current and the northward residual of Kuroshio, and the Changjiang Dilutel Water may also play an important role in summer.. It is important to note that position and dimension of a distinct circular-shaped region of c1ayey mud is surprisingly coincident with those of this eddy. |
| Key words: CYCLONIC EDDY |
