热带海洋学报

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苏禄-苏拉威西海内孤立波动力参数时空变化特征

谢皆烁1,2,龚延昆1,2,牛建伟1,2,何映晖1,2,陈植武1,2,许洁馨1,2,蔡树群1,2   

  1. 1. 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东 广州 510301; 2. 南方海洋科学与工程广东省实验室(广州), 广东 广州 511458;

  • 收稿日期:2021-12-24 修回日期:2022-03-17 出版日期:2022-04-19 发布日期:2022-04-19
  • 通讯作者: 蔡树群
  • 基金资助:

    国家自然科学基金项目(42130404,41776008); 中国科学院前沿科学重点研究计划(QYZDJ-SSW-DQC034); 南方海洋科学与工程广东省实验室(广州)专项(GML2019ZD0304); 广东省自然资源厅专项([2020]017); 广东特支计划科技创新青年拔尖人才项目(2019TQ05H519); 广东省自然科学基金-面上项目(2020A1515010495, 2021A1515012538, 2021A1515011613)

Spatial-temporal variations of the dynamic parameters of internal solitary waves in the Sulu–Celebes Sea

XIE Jieshuo1,2, GONG Yankun1,2, NIU Jianwei1,2, HE Yinghui1,2, CHEN Zhiwu1,2, XU Jiexin1,2, CAI Shuqu1,2   

  1. 1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China

  • Received:2021-12-24 Revised:2022-03-17 Online:2022-04-19 Published:2022-04-19
  • Contact: Shuqun Cai
  • Supported by:

     Project of Natural Science Foundation of China (42130404, 41776008); Key Research Program of Frontier Sciences, CAS (QYZDJ-SSW-DQC034); Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2019ZD0304); Special project by Department of natural resources of Guangdong Province ([2020]017); Youth Science and Technology Innovation Talent of Guangdong TeZhi Plan (2019TQ05H519); Natural Science Foundation of Guangdong Province (2020A1515010495, 2021A1515012538, 2021A1515011613)

摘要: 基于弱非线性理论及再分析同化数据,计算了苏禄-苏拉威西海冬季及夏季内孤立波动力参数,包括内孤立波线性速度、一阶和二阶非线性参数及线性色散参数,并研究了这些参数的时空变化特征。我们发现,虽然苏拉威西海域受到更加显著的西北太平洋水入侵,但苏禄海内孤立波动力参数的时空变化特征却比苏拉威西海更为显著。夏季苏禄海内孤立波线性速度总体上比冬季约大0.1 m·s-1;与此相反,夏季苏拉威西海内孤立波线性速度却比冬季约小0.05 m·s-1。无论是一阶或二阶非线性动力参数,其在苏拉威西海的时空变化均比较微弱,但在苏禄海则较为显著。苏禄海夏季一阶非线性动力参数比冬季高出约3×10-3 s-1,但是夏季二阶非线性动力参数却比1月份低约3×10-5 m-1·s-1。此外,相比冬季,夏季苏禄海和苏拉威西海的色散动力参数均有所减弱,但其在苏禄海减弱的幅度更大。文章指出,苏禄-苏拉威西海环流引起的水体层化最大浮力频率所在深度的时空变化是造成上述内孤立波动力参数时空变化的根本原因。

关键词: 苏禄-苏拉威西海, 内孤立波, 动力参数, 时空变化, 最大浮力频率

Abstract: On the basis of the weakly nonlinear theory of internal solitary waves (ISWs) and the reanalyzed assimilation data in the Sulu–Celebes Sea in both summer and winter, we calculate the dynamic parameters of the ISWs, including the linear wave speed, the first- and second-order nonlinear parameters and the linear dispersion parameter, and investigate the spatial-temporal variations of these parameters. We find that, although the intrusion from the north Pacific Ocean into the Celebes Sea is much obvious, the spatial-temporal variations of the dynamic parameters of the ISWs in the Sulu Sea is more significant than that in the Celebes Sea. In the Sulu sea, the linear speed of ISW in summer is ~0.1 m·s-1 larger than that in winter; however, in the Celebes Sea, the linear speed of ISW in summer is ~0.05 m·s-1 smaller than that in winter. Regardless of the first- and second-order nonlinear parameters, their variations in the Celebes Sea are relatively weak, but in the Sulu Sea, their variations are significant. In the Sulu Sea, the first-order nonlinear parameter in summer is ~3×10-3 s-1 higher than that in winter, but the second-order nonlinear parameter in summer is ~3×10-5 m-1·s-1 lower than that in winter. In addition, in both the Sulu and Celebes Sea, the linear dispersion parameter in summer tends to reduce, but the magnitude of the reduction in Sulu Sea is relatively large. This paper shows that the variation of the depth of the maximum buoyancy frequency in the Sulu–Celebes Sea is the dominant factor resulting in the associated spatial-temporal variations of the dynamic parameters of ISWs.

Key words: Sulu–Celebes Sea, internal solitary waves, dynamic parameters, spatial-temporal variations, maximum buoyancy frequency