| 长江口及其邻近海区环流和温、盐结构动力学研究Ⅱ.环流的基本特征 |
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| 引用本文： | 刘兴泉,尹宝树,侯一筠.长江口及其邻近海区环流和温、盐结构动力学研究Ⅱ.环流的基本特征[J].海洋与湖沼,2008,39(4). |
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| 作者姓名： | 刘兴泉 尹宝树 侯一筠 |
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| 作者单位： | 中国科学院海洋研究所,青岛,266071 |
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| 基金项目： | 国家自然科学基金，中国科学院知识创新工程项目 |
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| 摘 要： | 利用POM模型，以研究海区的海面风应力、温度和盐度资料作为海面边界条件，以与外海界面处的温度和盐度资料作为侧向液边界条件，并考虑长江径流、台湾暖流和东海沿岸流的影响，对长江口及其邻近海区各季节的三维斜压环流和温、盐结构进行了数值模拟。环流的数值结果表明，冬季和秋季研究海区的水平环流主要由长江径流、东海沿岸流、台湾暖流、杭州湾环流和沿岸流与台湾暖流之间的气旋和反气旋涡构成；东海沿岸流与长江径流顺岸南下，随着自北往南岸界地形坡度的增大，其流幅变窄，流速增强；台湾暖流沿陡坡及其外缘蜿蜒北上，随着自南往北水深的变浅，其流幅由宽变窄继而又由窄变宽，流速却一直由强变弱。冬季和秋季海区纬度断面垂直环流的总趋势由近岸向外海流动，海底地形变化缓慢区离岸流产生波动，海底地形变化显著的陡坡区离岸流产生剧烈振荡而生成强升降流。春季和夏季研究海区的水平环流主要由长江径流与东海沿岸流汇合流、台湾暖流、杭州湾环流、舟山群岛附近及长江径流和东海沿岸流汇合流与台湾暖流之间的气旋和反气旋涡构成；长江径流和台湾暖流平行北上并在长江口以北产生顺时针偏转。由海区水平环流特征和变化趋势证实，春季长江冲淡水已开始向东北偏转，夏季冲淡水的偏转程度、伸展距离和扩展范围都更甚于春季；春季在长江口近岸存在弱上升流，夏季长江口外的陡坡区出现下降流，而长江口以北和以南的陡坡区出现上升流。
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| 关 键 词： | 长江口邻近海区 水平环流 垂直环流 升降流 气旋涡 反气旋涡 |
THE DYNAMIC OF CIRCULATION AND TEMPERATURE-SALINITY STRUCTURE IN THE CHANGJIANG MOUTH AND ITS ADJACENT MARINE AREA II. MAJOR CHARACTERISTICS OF THE CIRCULATION |
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| LIU Xing-Quan,YIN Bao-Shu,HOU Yi-Jun.THE DYNAMIC OF CIRCULATION AND TEMPERATURE-SALINITY STRUCTURE IN THE CHANGJIANG MOUTH AND ITS ADJACENT MARINE AREA II. MAJOR CHARACTERISTICS OF THE CIRCULATION[J].Oceanologia Et Limnologia Sinica,2008,39(4). |
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| Authors: | LIU Xing-Quan YIN Bao-Shu HOU Yi-Jun |
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| Abstract: | Numerical simulations using POM on the 3D baroclinic circulations and T-S structures in the Changjiang River mouth and its adjacent area are presented. In situ data of surface wind stress, temperature (T), and salinity (S) were used for the surface boundary conditions; T,S, and runoff, Taiwan warm current and coastal current were used as side liquid boundaries. The results show that the horizontal circulation system in the research area in winter and autumn includes mainly the Changjiang River runoff, Hangzhou Bay circulation, the East China Sea coastal current, Taiwan warm current, and cyclone and anticyclone eddies between the East China Sea coastal current and Taiwan warm current. The East China Sea coastal current flows from north to south along the coast, and the Taiwan warm current flows meanderingly from south to north along a steep slope. The current width of the East China Sea coastal current becomes narrower and its intensity increases gradually with increasing seabottom slope from north to south. The current width of the Taiwan warm current becomes narrower and then wider when water depth shallows from south to north with weakening intensity. The vertical circulation runs from near shore to off shore in winter and autumn. Seaward current fluctuates gently in the area of mild relief, and severely in the area of large relief. In spring and summer, the horizontal circulation system in the research area includes mainly the Hangzhou Bay circulation, Changjiang River runoff, confluence current of the Changjiang River runoff with the East China Sea coastal current, and other cyclone or anticyclone eddies developed in the region. The Changjiang River runoff goes northward in parallel with the Taiwan warm current with a clockwise deflection, proved by spring-summer characteristics that the Changjiang diluted water deflect northeastward. The size and distance of deflection of the diluted water in summer is greater than those in spring. In spring, weak upwelling exists in the river mouth, whereas in summer downwelling occurs in steep area north and south of the mouth. |
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| Keywords: | The Changjiang River mouth sea area Torizontal circulation Vertical circulation Upwelling Downwelling Cyclone eddy Anticyclone eddy |
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