Sources of baroclinic tidal energy in the Gaoping Submarine Canyon off southwestern Taiwan
Sources of baroclinic tidal energy in the Gaoping Submarine Canyon off southwestern Taiwan
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DOI：
10.1029/2011jc007366
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发表时间：
2011-12
影响因子：
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通讯作者：
M. Chiou;S. Jan;Joe Wang;R. Lien;Hwa Chien
中科院分区：
文献类型：
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作者：
M. Chiou;S. Jan;Joe Wang;R. Lien;Hwa Chien
[1]采用O1、K1、M2和S2四个分潮驱动的三维潮流模式，对台湾西南外海高屏海底峡谷（GPSC）的斜压潮能来源进行了研究。模式区域覆盖了吕宋海峡和台湾海峡东南部等可能的初级生成地点。模拟的斜压潮汐与GPSC的潮流速度、等温线垂直位移和斜压潮汐能通量观测结果基本一致。在GPSC中，根据模型结果计算的深度积分的七天平均Fbc为2.2 kW m−1，相应的面积积分Fbc达到189.4 MW。从模型得到的结果表明，斜压潮汐导致强烈的湍流混合附近的峡谷头与垂直扩散率为3.5 × 10−3 m2 s−1。GPSC的斜压潮能主要产生在LS的西部脊和TS东南部的陡峭地形上。本地斜压能只占总能量的4.4%。另外95.6%的斜压潮汐能是在LS和TS东南部远程产生的，其中31.9%和8.8%分别直接辐射到GPSC。分别从南海和南海东南部辐射的西北和东南斜压能量束在南海洋面外相遇并形成内部的部分滞留潮。GPSC中剩余的斜压潮汐能量中，来自内部部分立潮的横斜压能量占54.9%。
[1] A three-dimensional model driven by tidal constituents O1, K1, M2 and S2 was adopted to evaluate the sources of baroclinic tidal energy in the Gaoping Submarine Canyon (GPSC) off southwestern Taiwan. The model domain covered the probable primary generation sites, including the Luzon Strait (LS) and the southeastern Taiwan Strait (TS). The simulated baroclinic tides agreed with the observations of tidal current velocity, isotherm vertical displacement, and baroclinic tidal energy flux (Fbc) in the GPSC. The depth-integrated, seven-day-averaged Fbc computed from the model result was 2.2 kW m−1 in the GPSC, and the corresponding area-integrated Fbc reached 189.4 MW. The results obtained from the model suggest that the baroclinic tides lead to strong turbulent mixing near the canyon head with a vertical diffusivity of 3.5 × 10−3 m2 s−1. Baroclinic tidal energy in the GPSC is mainly generated on the western ridge in the LS and on the steep topography in the southeastern TS. The local generation of baroclinic energy only accounts for 4.4% of the total value. The other 95.6% of the baroclinic tidal energy is remotely generated at the LS and the southeastern TS of which 31.9% and 8.8% are directly emanated, respectively, into the GPSC. The northwestward and southeastward baroclinic energy beams radiating from the LS and the southeastern TS, respectively, meet each other and form internal partial standing tides outside the GPSC. The transverse baroclinic energy from the internal partial standing tides accounts for the remaining 54.9% of the baroclinic tidal energy in the GPSC.