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Characteristics of coastal trapped waves along the northern coast of the South China Sea during year 1990

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Abstract

The structures and evolution of the coastal-trapped waves (CTW) along the northern coast of the South China Sea (SCS) in the year 1990 are studied using observed hourly sea level records collected from four sites around the northern SCS and a three-dimensional numerical model with realistic bathymetry and wind forcing. Analysis of the yearlong records of the observed sea level data indicates that the sea level variations are highly correlated between the stations and the sea level variability propagates southwestward along the coast. The sea level signals traveling from northeast to southwest along the coast with a propagation speed of 5.5–17.9 m s−1 during both the typhoon season and the winter month show the characteristics of a CTW. The wave speed is faster between stations Shanwei and Zhapo than that between Xiamen and Shanwei. Sea level variations during both typhoon season and winter month are reasonably well represented by the numerical model. The model runs focused on the wave signals related to typhoons and winter storm show that the CTW propagating southwestward along the coast can be reinforced or decreased by the local wind forcing during its propagation and there are apparent differences in the propagation characteristics between the waves along the mainland and those traveling around Hainan Island. The abrupt change of the shelf width and coastline around Leizhou Peninsula and Hainan Island are responsible for strong scattering of CTWs from one mode into higher modes. The alongshore velocities across different transects associated with CTW are investigated to examine the vertical structures of the waves. The alongshore velocity structures at transects during different events are related to the combined effect of stratification and shelf profile, which can be estimated using the Burger number. The empirical orthogonal function analysis of alongshore velocity and nodal lines of the mode structure suggest mode two CTWs in transect S2 during typhoon season and mode 1 CTWs during winter. Sensitivity model experiments are also performed to demonstrate the effects of local wind and topography on the wave propagation.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (no. 40976001). We thank Dr. Changsheng Chen for sharing the FVCOM code. The authors are grateful to Dr. Xiuquan Wan and Zhigang Yao of Ocean University of China for helpful discussions. The authors are thankful to University of Hawaii Sea Level Center, NOAA-CIRES Climate Diagnostics Center, the Joint Typhoon Warning Center, Simple Ocean Data Assimilation/TAMU Research Group, and Physical Oceanography Distributed Active Archive Center for providing the valuable data. We also thank the two Ocean Dynamics reviewers for carefully reviewing the manuscript and providing valuable comments.

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  1. College of Physical and Environmental Oceanography, Ocean University of China, Qingdao, 266100, China

    Yang Ding, Xianwen Bao & Maochong Shi

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  1. Yang Ding
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Correspondence to Yang Ding.

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Ding, Y., Bao, X. & Shi, M. Characteristics of coastal trapped waves along the northern coast of the South China Sea during year 1990. Ocean Dynamics 62, 1259–1285 (2012). https://doi.org/10.1007/s10236-012-0563-3

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