Generation of diurnal internal solitary waves (ISW-D) in the Sulu Sea: From geostationary orbit satellites and numerical simulations

IF 3.8 3区地球科学 Q1 OCEANOGRAPHY

Progress in Oceanography Pub Date : 2024-05-23 DOI:10.1016/j.pocean.2024.103279

Longyu Huang , Jingsong Yang , Zetai Ma , Bingqing Liu , Lin Ren , Antony K. Liu , Peng Chen

{"title":"Generation of diurnal internal solitary waves (ISW-D) in the Sulu Sea: From geostationary orbit satellites and numerical simulations","authors":"Longyu Huang , Jingsong Yang , Zetai Ma , Bingqing Liu , Lin Ren , Antony K. Liu , Peng Chen","doi":"10.1016/j.pocean.2024.103279","DOIUrl":null,"url":null,"abstract":"<div><p>Our recent study reported the existence of internal solitary waves with the diurnal tidal cycle (ISW-D) in the Sulu Sea, however, the three-dimensional characteristics and generation mechanism of ISW-D are still unclear (Huang et al., 2023). In this work, the spatial–temporal characteristics, generation mechanism and propagating process of ISW-D in the Sulu Sea are first preliminary investigated based on high-temporal-resolution Geostationary Orbiting Satellite (GOS) images and high-spatial-resolution two-dimensional numerical model (MITgcm). GOS images from 2018-2022 are retrieved and a total of 13 pairs of ISW-D packets are found. ISW-D occur at spring tide during May–August, with an average interpacket distance of 198 km and a phase speed of 2.30 m/s. To further knowledge of the generation mechanism and propagation process of ISW-D, the non-linear and non-hydrostatic numerical simulations are conducted. The comparison of ISW-D parameters with GOS images proves the validity of numerical simulations. The results of numerical simulations and theoretical parameters indicate that ISW-D are generated at the sill near Pearl Bank by internal tide release mechanism. Moreover, three sensitivity experiments are designed to investigate the effects of tidal force and seawater stratification on the generation and propagation of ISW-D. The results reveal that the ISW-D is generated by diurnal tides with stronger intensity than semidiurnal tides. Seawater stratification does not influence the generation of ISW-D but modulates the propagation process. Phase speeds from GOS images and theoretical model show a positive correlation between the phase speeds of ISW-D and the intensity of seawater stratification.</p></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"225 ","pages":"Article 103279"},"PeriodicalIF":3.8000,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Progress in Oceanography","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0079661124000855","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OCEANOGRAPHY","Score":null,"Total":0}

引用次数: 0

Abstract

Our recent study reported the existence of internal solitary waves with the diurnal tidal cycle (ISW-D) in the Sulu Sea, however, the three-dimensional characteristics and generation mechanism of ISW-D are still unclear (Huang et al., 2023). In this work, the spatial–temporal characteristics, generation mechanism and propagating process of ISW-D in the Sulu Sea are first preliminary investigated based on high-temporal-resolution Geostationary Orbiting Satellite (GOS) images and high-spatial-resolution two-dimensional numerical model (MITgcm). GOS images from 2018-2022 are retrieved and a total of 13 pairs of ISW-D packets are found. ISW-D occur at spring tide during May–August, with an average interpacket distance of 198 km and a phase speed of 2.30 m/s. To further knowledge of the generation mechanism and propagation process of ISW-D, the non-linear and non-hydrostatic numerical simulations are conducted. The comparison of ISW-D parameters with GOS images proves the validity of numerical simulations. The results of numerical simulations and theoretical parameters indicate that ISW-D are generated at the sill near Pearl Bank by internal tide release mechanism. Moreover, three sensitivity experiments are designed to investigate the effects of tidal force and seawater stratification on the generation and propagation of ISW-D. The results reveal that the ISW-D is generated by diurnal tides with stronger intensity than semidiurnal tides. Seawater stratification does not influence the generation of ISW-D but modulates the propagation process. Phase speeds from GOS images and theoretical model show a positive correlation between the phase speeds of ISW-D and the intensity of seawater stratification.

查看原文本刊更多论文

苏禄海昼夜内孤波（ISW-D）的产生：来自地球静止轨道卫星和数值模拟的结果

我们最近的研究报道了苏禄海存在昼夜潮汐周期的内孤波（ISW-D），然而，ISW-D的三维特征和生成机制仍不清楚（Huang等，2023）。本研究基于高时间分辨率静止轨道卫星（GOS）图像和高空间分辨率二维数值模式（MITgcm），首次初步研究了苏禄海 ISW-D 的时空特征、生成机理和传播过程。检索了 2018-2022 年的 GOS 图像，共发现 13 对 ISW-D 包。ISW-D发生在5-8月的春潮期，包间平均距离为198千米，相速为2.30米/秒。为了进一步了解 ISW-D 的产生机制和传播过程，对其进行了非线性和非流体静力学数值模拟。ISW-D 参数与全球观测系统图像的对比证明了数值模拟的有效性。数值模拟结果和理论参数表明，ISW-D 是通过内潮释放机制在珍珠滩附近的崖壁上产生的。此外，还设计了三个敏感性实验来研究潮汐力和海水分层对 ISW-D 产生和传播的影响。结果表明，ISW-D 由昼夜潮汐产生，其强度大于半昼夜潮汐。海水分层并不影响 ISW-D 的产生，但会调节其传播过程。从全球观测系统图像和理论模型得出的相位速度表明，ISW-D 的相位速度与海水分层的强度呈正相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Progress in Oceanography 地学-海洋学

CiteScore

7.20

自引率

4.90%

发文量

138

审稿时长

3 months

期刊介绍： Progress in Oceanography publishes the longer, more comprehensive papers that most oceanographers feel are necessary, on occasion, to do justice to their work. Contributions are generally either a review of an aspect of oceanography or a treatise on an expanding oceanographic subject. The articles cover the entire spectrum of disciplines within the science of oceanography. Occasionally volumes are devoted to collections of papers and conference proceedings of exceptional interest. Essential reading for all oceanographers.