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首页> 外文期刊>Nonlinear processes in geophysics >Lagrangian transport in a microtidal coastal area: the Bay of Palma, island of Mallorca, Spain
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Lagrangian transport in a microtidal coastal area: the Bay of Palma, island of Mallorca, Spain

机译：小潮汐沿海地区的拉格朗日运输：西班牙马略卡岛的帕尔马湾

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Coastal transport in the Bay of Palma, a small region in the island of Mallorca, Spain, is characterized in terms of Lagrangian descriptors. The data sets used for this study are the output for two months (one in autumn and one in summer) of a high resolution numerical model, ROMS (Regional Ocean Model System), forced atmospherically and with a spatial resolution of 300 m. The two months were selected because of their different wind regime, which is the main driver of the sea dynamics in this area. Finite-size Lyapunov exponents (FSLEs) were used to locate semi-persistent Lagrangian coherent structures (LCS) and to understand the different flow regimes in the bay. The different wind directions and regularity in the two months have a clear impact on the surface bay dynamics, whereas only topographic features appear clearly in the bottom structures. The fluid interchange between the bay and the open ocean was studied by computing particle trajectories and residence time (RT) maps. The escape rate of particles out of the bay is qualitatively different, with a 32% greater escape rate of particles to the ocean in October than in July, owing to the different geometric characteristics of the flow. We show that LCSs separate regions with different transport properties by displaying spatial distributions of residence times on synoptic Lagrangian maps together with the location of the LCSs. Correlations between the time-dependent behavior of FSLE and RT are also investigated, showing a negative dependence when the stirring characterized by FSLE values moves particles in the direction of escape.
机译：帕尔马湾（西班牙马略卡岛的一个小区域）的沿海运输以拉格朗日描述符为特征。用于这项研究的数据集是高分辨率数值模型ROMS（区域海洋模型系统）的两个月（秋季一个，夏季一个）的输出，其大气强迫且空间分辨率为300 m。选择这两个月是因为它们的风况不同，这是该地区海洋动力的主要驱动力。使用有限大小的Lyapunov指数（FSLE）来定位半永久拉格朗日相干结构（LCS）并了解海湾中的不同流态。两个月中不同的风向和规律性对表层海湾动力学有明显影响，而底部结构中只有地形特征清晰可见。通过计算粒子轨迹和停留时间（RT）图，研究了海湾与开放海洋之间的流体交换。颗粒从海湾中逸出的速率在质量上有所不同，由于水流的几何特征不同，10月颗粒向海洋的逸出速率比7月份高32％。我们通过在天气拉格朗日地图上显示停留时间的空间分布以及LCS的位置，来显示LCS分离具有不同运输属性的区域。还研究了FSLE和RT随时间变化的行为之间的相关性，当以FSLE值为特征的搅拌将颗粒向逃逸方向移动时，显示出负相关性。

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