Eulerian and Lagrangian Statistics in the South China Sea as Deduced from Surface Drifters
Eulerian and Lagrangian Statistics in the South China Sea as Deduced from Surface Drifters
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DOI：
10.1175/jpo-d-12-0170.1
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发表时间：
2013-04
影响因子：
3.5
通讯作者：
Yu‐Kun Qian;S. Peng;Yineng Li
中科院分区：
文献类型：
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作者：
Yu‐Kun Qian;S. Peng;Yineng Li
根据地面速度计划卫星追踪的拉格朗日漂移子的观测资料，研究了南海中国海面流的欧拉统计和拉格朗日统计。尽管该数据集包含了截至2011年的最新观测数据，但这些数据的空间和时间分布非常不均匀。吕宋海峡以及南海的北部和西部被漂流者大量采样，而南海内部的采样较少。由于季节采样偏向冬季，从所有漂流观测得到的总体欧拉平均环流与冬季环流相似。研究发现，扩散系数的计算可能受到年周期等低频时间变化的影响，而这些时间变化可以用高斯-马尔可夫分解来消除。在吕宋海峡周边海域，扩散系数、时间尺度和长度尺度的典型值分别为3.7~11.9×107cm2 S−1，0.8~1.9d和16.4~44.4 km，r.
AbstractEulerian and Lagrangian statistics of the surface flows over the South China Sea (SCS) are investigated based on observations of satellite-tracked Lagrangian drifters of the Surface Velocity Program. Although the dataset contains the most recent observations up to 2011, the spatial and temporal distributions of the data are quite inhomogeneous. The Luzon Strait as well as the northern and western parts of the SCS are heavily sampled by drifters whereas the internal SCS is less sampled. The overall Eulerian mean circulation derived from all drifter observations resembles the wintertime circulations because of the seasonal sampling bias toward wintertime. It is found that the calculation of the diffusivity may be misled by the low-frequency temporal variabilities such as annual cycle, which could be removed using the Gauss–Markov decomposition. In the regions around Luzon Strait, typical values of diffusivity, time scale, and length scale are 3.7–11.9 × 107 cm2 s−1, 0.8–1.9 days, and 16.4–44.4 km, r...