Three‐dimensional structure of the summertime circulation in the Yellow Sea from a wave‐tide‐circulation coupled model
Three‐dimensional structure of the summertime circulation in the Yellow Sea from a wave‐tide‐circulation coupled model
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DOI：
10.1029/2005jc003218
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发表时间：
2006-11
影响因子：
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通讯作者：
Changshui Xia;F. Qiao;Yongzeng Yang;Jian Ma;Yeli Yuan
中科院分区：
文献类型：
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作者：
Changshui Xia;F. Qiao;Yongzeng Yang;Jian Ma;Yeli Yuan
[1]本文利用一个基于POM和表面波模式的波浪-潮汐-环流预报耦合模式，研究了黄海夏季环流的三维结构。模拟得到的潮汐调和常数和温度结构与观测结果吻合较好。模拟的盐度分布与观测结果基本一致。模拟结果表明，该环流具有三层结构：表层（0-4 m）为东北向主流，上层（4-40 m）为盆地尺度的反（气旋）式环流，底层（40 m以下）为中心区分流，沿YS槽沿着有弱的南向流。流函数分析表明，黄海的净环流为反气旋型，净输送量约为0.1Sv。动量平衡和敏感性诊断分析表明，上层气旋性环流主要是沿着潮致温度锋的准地转流，潮余流也加强了气旋性环流。潮余流和表层向北风输运的补偿作用有助于底层向南流的形成。垂直环流在不同断面沿着变化。在靠近韩国海岸的锋面区域发现一个环流圈，沿斜坡发现一个上升流沿着。
[1] The three-dimensional structure of the summertime circulation of the Yellow Sea (hereafter YS) is studied by using a prognostic wave-tide-circulation coupled model based on the Princeton Ocean Model (POM) and a surface wave model. The simulated tidal harmonic constants and temperature structure agree with the observations well. The patterns of the simulated salinity generally agree also with the observations. The simulated results show that the horizontal circulation has a three-layer structure: in the surface layer (0–4 m), the prevailing current direction is northeastward; in the upper layer (4–40 m) it is dominated by a basin scale anticlockwise (cyclonic) gyre; in the bottom layer (below 40 m) the water diverges from the center area and there exists a weak southward current along the YS trough. The stream function of the YS shows that the net circulation of the YS is an anticlockwise (cyclonic) one, and the net transport is about 0.1 Sv. Diagnostic analysis of the momentum balance and sensitivity show that the cyclonic circulation in the upper layers is mainly a quasi-geostrophic flow along tidal-induced temperature front, and it is also strengthened by the tide residual currents. The tidal residual current and the compensation for northward surface layer wind transport contribute to the formation of southward flow in the bottom layer. The vertical circulations vary along different sections. A circulation cell is found in the frontal area near the Korean coast, and an upwelling is found along the slope.