| 摘要: |
| 利用作者已建立的σ坐标系下三维非线性斜压陆架模式，研究黄海冷水团（YSCWM）对长江冲淡水（CDW）扩展的影响。数值试验结果表明，黄海冷水团产生的余流，与黄海冷水团的强度和海底地形有关。在长江口海区由于底形的影响，黄海冷水团产生了向北流动的海流，阻碍着长江冲淡水沿岸向南扩展。在远离长江口海区，黄海冷水团产生的气旋式黄海环流诱导冲淡水向东南运动。总的黄海冷水团的作用是使长江冲淡水低盐水舌伸向东北，黄海冷水团越强，这种作用就越明显。黄海冷水团在夏季长江冲淡水伸向东北过程中起着重要的作用。 |
| 关键词: 长江冲淡水 扩展 黄海冷水团 数值试验 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49406070号;上海市青年科技启明星资助项目。 |
附件 |
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| THE IMPACT OF TPHE YELLOW SEA COLD WATER MASS ON THE EXPANSION OF THE CHANGJIANG DILUTED WATER |
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ZHU Jian-rong,XIAO Cheng-you,SHEN Huan-ting,ZHU Shou-xian
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1.State Key Laboratory of Estuarine and Coastal Aesearch, shanghai, 200062;2.Nanjing Air Force Meteorological College, Nanjing, 211101
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| Abstract: |
| A three-dimension nonlinear baroclinic and continental shelf model with primitive equations in σ coordinate system was used to study the impact of the Yellow Sea Cold Water Mass (YSCWM) on the expansion of the Changjiang Diluted Water (CDW). The calculation domain is the whole East China Sea. The horizontal resolution of the model is 7.5′×7.5′, and the vertical resolution is 11 layers. The ocean control equations were discreted in a completely staggered grid system and the Alternating Direction Implicit (ADI) scheme was adopted for the numerical resolution. The semi-momentum scheme which is quadratic conservation was adopted for the nonlinear terms in the momentum equations. The implicit scheme was used for the vertical eddy diffusion terms in the temperature and salt equation. The numerical experiments showed that the YSCWM induced the residual current’s northward flows along the Zhejiang coast in the sea area near the Changjiang mouth due to the effect of the topography that blocked the CDW’s southward expansion along the coast. The YSCWM induced cyclonic Yellow Sea circulation guides the CDW’s southeastward expansion in the sea area far from the Changjiang mouth. Taking into consideration the factors of the Kuroshio, Taiwan Warm Current, coastal current, wind stress and topography, this numerical experiment showed the northeast expanding freshwater tongue and the circulation structure in the East China Sea in summer. The YSCWM has significant influence on the northeastward turning direction of the CDW. The stronger the YSCWM is, the greater the effect of the YSCWM induced residual currents and the more obvious the northeastward turning of the CDW. |
| Key words: Changjiang Diluted, Water Expansion, Yellow Sea Cold Water Mass, Numerical experiments |
