Observations of different effects of an anti-cyclonic eddy on internal solitary waves in the South China Sea

Xu, Jiexin; He, Yinghui; Chen, Zhiwu; Zhan, Haigang; Wu, Yuqi; Xie, Jieshuo; Shang, Xiaodong; Ning, Dezhi; Fang, Wendong; Cai, Shuqun

doi:10.1016/j.pocean.2020.102422

Cited by 17 publications

(6 citation statements)

References 39 publications

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“…Nevertheless, to our knowledge the in situ observational study on this topic is still scarce. To present an observational evidence of circulation‐induced variation, we revisit our field measurements in the northern SCS from August to September 2014 (see Figures 3a and 3b in J. Xu et al., 2020). This observational study shows the ISWs over three spring‐neap tidal cycles but lacks analysis of Kuroshio effect.…”

Section: Summary and Discussionmentioning

confidence: 99%

Variation of Internal Solitary Wave Propagation Induced by the Typical Oceanic Circulation Patterns in the Northern South China Sea Deep Basin

Xie

Fang

et al. 2021

Geophysical Research Letters

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Section: Summary and Discussionmentioning

confidence: 99%

Variation of Internal Solitary Wave Propagation Induced by the Typical Oceanic Circulation Patterns in the Northern South China Sea Deep Basin

Xie

Fang

et al. 2021

Geophysical Research Letters

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“…The instruments carried by the moorings generally functioned well, but CT sensors stopped working after 6 September 2014 due to the lack of power. Besides, Xu et al (2020) indicated that an anti-cyclonic eddy dominated the region of the mooring since mid-September 2014, which significantly affected the local wave properties at the DS station. To avoid the impacts of background currents, we selected fifteen ISWs during the spring tidal period from 00:00 UTC 8 August to 00:00 UTC 15 August as criteria to quantitatively evaluate the performance of sensitivity numerical experiments.…”

Section: In-situ Measurementsmentioning

confidence: 99%

An internal solitary wave forecasting model in the northern South China Sea (ISWFM-NSCS)

Gong

Chen

et al. 2023

Preprint

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Abstract. Internal solitary waves (ISWs) are a ubiquitous phenomenon in the dynamic ocean system, which play a crucial role in driving transport through turbulent mixing. Over the past few decades, numerical modelling became a vital approach to investigate the generation mechanism and spatial distribution of ISWs. The northern South China Sea (NSCS) has been treated as a physical oceanographic focus of ISWs in massive numerical studies since last century. However, there was no systematic evaluation of a reliable three-dimensional model about accurately reproducing ISW characteristics in the NSCS. In this study, we implement a three-dimensional ISW forecasting model in the NSCS and quantitatively evaluate the requirements of factors (i.e., model resolution, tidal forcing, and stratification selection) in precisely depicting ISW properties by comparing with observational data at a mooring station in the vicinity of the Dongsha Atoll. Firstly, the 500 m-resolution model can basically reproduce the principal ISW characteristics, while the 250 m-resolution model would be a better solution to identify wave properties, specifically increasing 40 % accuracy of predicting characteristic half-widths. Nonetheless, a 250 m-resolution model spends nearly fivefold computational resources of a 500 m-resolution model in the same model domain. Compared with the former two, the model with a lower resolution of 1000 m severely underestimates the nonlinearity of ISWs, resulting in an incorrect ISW field in the NSCS. Secondly, the model with eight (or thirteen) primary tidal constituents can accurately reproduce the real ISW field in the NSCS, while the one with four main harmonics (M2, S2, K1 and O1) would underestimate averaged wave-induced velocity for about 38 % and averaged mode-1 wave amplitude for about 15 %. Thirdly, the model with the initial condition of field-extracted stratification gives a better performance in predicting some wave properties than the model with climatological stratification, namely 13 % improvement of arrival time and 46 % improvement of characteristic half-width. Finally, background currents, spatially varying stratification and external (wind) forcing are discussed to reproduce a more realistic ISW field in the future numerical simulations.

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“…The parameters  and  are called the nonlinear coefficient and dispersion coefficient, respectively. The well-known solitary wave solution to (2)…”

Section: Theoretical Modelsmentioning

confidence: 99%

“…Internal solitary waves (ISWs), which are a kind of nonlinear internal wave, are ubiquitous in marginal sea areas [1,2]. The South China Sea (SCS) is one of the most important sea areas for the study of ISWs.…”

Section: Introductionmentioning

confidence: 99%

Experimental and observational analysis of vertical characteristics of internal solitary waves

Peng

Wei

et al. 2023

J. Phys.: Conf. Ser.

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The basic elements of internal solitary waves (ISWs) were obtained by vertically placed sensors in the laboratory experiment and in-situ observation. The vertical characteristics of the amplitude and waveform are analysed experimentally and observationally. Then the experimental and observational results were compared with the theoretical model. The study shows that the experimental amplitude-frequency relationship is closer to that in the two-layer model while the observational amplitude-frequency relationship is more approaching to that in the continuously stratified model. Experimental and observational results reveal that the amplitude of ISWs increase first and then decrease with an increasing depth. The sech2 function of the KdV theory can describe the waveforms of ISWs at different depths well.

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Observations of different effects of an anti-cyclonic eddy on internal solitary waves in the South China Sea

Cited by 17 publications

References 39 publications

Variation of Internal Solitary Wave Propagation Induced by the Typical Oceanic Circulation Patterns in the Northern South China Sea Deep Basin

Variation of Internal Solitary Wave Propagation Induced by the Typical Oceanic Circulation Patterns in the Northern South China Sea Deep Basin

An internal solitary wave forecasting model in the northern South China Sea (ISWFM-NSCS)

Experimental and observational analysis of vertical characteristics of internal solitary waves

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