| 摘要: |
| 为了揭示沿岸海区冬季垂直环流及其温盐结构的分布特征和变化规律，利用三维斜压流体动力学模型，对具有岸界坡度变化、河流入海、海湾、岛屿和海槽的理想海区冬季的垂直环流及其温盐结构进行了数值模拟。其环流的数值结果表明，冬季沿岸海区的垂直环流普遍呈逆时针流动。在近表层为向岸流，沿岸为下降流，近表层以下为离岸流；近表层以下的离岸流在外海有明显的上升趋势；沿岸下降流自表层至底层逐渐由强变弱；就整个海区而言，随着自南往北海区水深的逐渐变浅和岸界地形坡度的由大变小，其沿岸下降流则由强变弱。 |
| 关键词: 沿岸海区 冬季 数值模拟 垂直环流 下降流 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学重点基金!49136140 |
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| NUMERICAL STUDY ON VERTICAL CIRCULATION AND T-S STRUCTURE IN COASTAL SEA AREA DURING WINTERTIMEI.BASIC CHARACTERISTICS OF THE CIRCULATION |
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Liu Xingquan
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Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071
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| Abstract: |
| In order to identify patterns of distribution and spatial variations of the vertical circulation, and temperature and salinity structures in the coastal sea area during the wintertime, numerical simulations were carried out for an ideal sea area using a variety of data sets for the seabed topography, and river discharges into the sea. The simulations were based upon a three-dimensional baroclinic ocean model. The computational results show the formation of an anticlockwise vertical circulation during wintertime, shoreward currents in the near-surface layer, downwelling in the nearshore area, and offshore currents below the near-surface layer, with a rising tendency in the outside sea. The downwelling gradually weakens from the surface layer to the bottom layer. Over the whole coastal area, the intensity of the downwelling decreases with the decreasing of water depth and seabed slope. The coastal downwelling mechanism can be attributed mainly to a coupling effect between wind stress and seashore, and the inhomogeneous distributions of temperature and salinity. |
| Key words: Coastal sea area, Wintertime, Numerical simulation, Vertical, circulation, Downwelling |
