Seasonal migration of the Yellow Sea Bottom Cold Water
Seasonal migration of the Yellow Sea Bottom Cold Water
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DOI：
10.1002/2014jc009873
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发表时间：
2014-07
影响因子：
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通讯作者：
Bin Wang;N. Hirose;Boonsoon Kang;Katsumi Takayama
中科院分区：
文献类型：
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作者：
Bin Wang;N. Hirose;Boonsoon Kang;Katsumi Takayama
采用区域环流模式和双向拉格朗日粒子跟踪方法研究了黄海底部冷水的三维运动及其相关动力因素。模拟结果与水文观测结果吻合较好。模拟粒子的运动轨迹表明，从春季到夏季，来自黄海北部的地下冷重水团沿黄海槽西坡逐渐下沉到更深的层中，并向南移动。从3月初到7月或8月，冷水团逐渐加速，最终在9月底或10月初到达最南端。此外，敏感性实验表明，斜压条件下的潮致残余流是夏季黄海深层环流的主导因素。夏季偏南风和强烈的地表太阳辐射是影响南移的次要因素。本文还提出了一种基于35°N ~ 39°N 3月中部盆地（深度大于40 m）温度统计数据的改进的YSBCW划界方法，其增加速率约为0.7°C/月，比常用的8°C或10°C等温线常数更合适。
The three-dimensional motion of the Yellow Sea Bottom Cold Water (YSBCW) and the relevant dynamical factors are studied using a regional circulation model and the two-way Lagrangian particle tracking method (PTM). The simulated results are in good agreement with hydrographic observations. The trajectories of the modeled particles show that the subsurface cold heavy water mass from the northern part of the Yellow Sea gradually sinks into deeper layers along the western slope of the Yellow Sea trough with a southward movement from spring to summer. The cold water mass gradually gathers speed from early March to July or August, and eventually reaches its southernmost location in late September or early October. Furthermore, sensitivity experiments demonstrate that tide-induced residual currents under baroclinic conditions are the dominant factor driving deep circulation during summertime in the Yellow Sea. The summer southerly wind and strong surface solar radiation are the secondary factors influencing the southward migration. This study also proposes an improved delimitation for the YSBCW based on temperature statistics in the central basin (deeper than 40 m) between 35°N and 39°N in March with an increase in rate of approximately 0.7°C/month, which is more appropriate than the constants of the 8°C or 10°C isotherms frequently used.