Observations of anomalously strong mode-2 internal solitary waves in the central Andaman sea by a mooring system

IF 2.3 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2024-04-21 DOI:10.1016/j.dsr.2024.104300

Zijian Cui , Weifang Jin , Tao Ding , Chujin Liang , Feilong Lin , Beifeng Zhou , Binbin Guo , Qianyong Liang

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Abstract

During the period from July 2016 to July 2018, a mooring system deployed in the central Andaman Sea recorded a significant number of highly intense mode-2 internal solitary waves (ISWs), with wave-induced current strengths comparable to those of local mode-1 ISWs. Distinct propagation characteristics and seasonal variations are uncovered, with mode-2 ISWs being identified as primarily propagating eastward and exhibiting a notable frequency peak from November to March. A significant correlation is established between the occurrence of mode-2 ISWs and higher-mode internal tides (ITs), particularly characterized by a high correlation with the third Empirical Orthogonal Function (EOF) mode. Combined with satellite remote sensing images, it is further confirmed that mode-2 ISWs are generated by the nonlinear steepening of ITs and propagate over long distances through resonance with higher-mode ITs. In contrast, our findings suggest that mode-1 ISWs are predominantly generated by the Lee-wave mechanism, especially south of the Ten Degree Channel, and typically propagate northeastward. This study underscores the complex interplay of ocean stratification and seabed topography in the genesis and propagation of ISWs.

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利用系泊系统观测安达曼海中部异常强烈的模-2 内孤波

2016 年 7 月至 2018 年 7 月期间，部署在安达曼海中部的系泊系统记录到大量高度强烈的模式-2 内孤波（ISWs），波浪诱导的海流强度与当地模式-1 内孤波相当。发现了模式-2 内孤波的独特传播特征和季节性变化，确定模式-2 内孤波主要向东传播，并在 11 月至次年 3 月表现出明显的频率峰值。模式 2 ISW 的出现与高模式内潮（ITs）之间存在明显的相关性，特别是与第三个经验正交函数（EOF）模式高度相关。结合卫星遥感图像，进一步证实了模式-2 ISW 是由 ITs 的非线性陡变产生的，并通过与高模式 ITs 的共振进行远距离传播。相比之下，我们的研究结果表明，模式-1 ISW 主要由李波机制产生，尤其是在十度海峡以南，通常向东北方向传播。这项研究强调了海洋分层和海底地形在 ISWs 产生和传播过程中的复杂相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Deep-Sea Research Part I-Oceanographic Research Papers 地学-海洋学

CiteScore

4.60

自引率

4.20%

发文量

144

审稿时长

18.3 weeks

期刊介绍： Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.