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

Xie, Jieshuo; Fang, Wendong; He, Yinghui; Chen, Zhiwu; Liu, Guangping; Gong, Yunhui; Cai, Shuqun

doi:10.1029/2021gl093969

Cited by 16 publications

(11 citation statements)

References 64 publications

(119 reference statements)

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“…During the southward propagation of ISWs, when they encounter the Kuroshio Branch Current and the South China Sea Warm Current flowing northward, they will pile up in the middle of the Penghu Channel. In a vast sea area, circulation affects the velocity and amplitude of ISWs (Xie et al ., 2021) and even distorts ISWs (Xie et al ., 2015). However, the area of the Penghu Channel is small, and the influence of circulation on ISWs is not obvious.…”

Section: Resultsmentioning

confidence: 99%

Characteristics and Influencing Factors of Internal Solitary Waves in the Penghu Channel Based on Satellite Remote Sensing

Zhang

Meng

Sun

et al. 2023

Journal of Coastal Research

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The Taiwan Strait has always been considered a hot spot for the occurrence of internal waves in the ocean. Recent research shows that the Penghu Channel also has a strong and previously unknown source of internal solitary waves (ISWs). In this paper, 23 satellite remote sensing images covering the Penghu Channel from Sentinel-1 synthetic aperture radar (SAR), Envisat advanced synthetic aperture radar, HY-1D, and GF-1 satellites are examined to reveal the sea surface characteristics of the area's ISWs through image interpretation and dynamics analysis and to study the local generation of ISWs and their evolutionary characteristics in this sea area. The results show that SE and SW crosspropagating ISWs exist in the Penghu Channel. They are generated near the Penghu Islands and the continental shelf of Taiwan at the same latitude and propagate in a countercurrent direction along the Penghu Channel. The ISWs from these two directions meet and continue to propagate southward in a V shape, with various wave-wave interactions occurring in the middle of the channel, such as Mach and resonance interactions, depending on the strength and angle characteristics of the ISWs. SAR images also show that waveform broadening occurs during the propagation of ISWs to the shallow shelf and the ISWs' polarity transition phenomenon. Although the specific generation mechanism is not clear, it is speculated that the interaction of the tidal current with the complex topography of the Penghu Channel is the main source of energy for these ISWs. In addition, the combination of drifting buoy data and analysis of hydrographic conditions in the Penghu Channel indicates that ISW phenomena on the sea surface are observed more frequently during summer flood tides with low wind speeds, low sea conditions, strong stratification, and strong currents.

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Section: Resultsmentioning

confidence: 99%

Characteristics and Influencing Factors of Internal Solitary Waves in the Penghu Channel Based on Satellite Remote Sensing

Zhang

Meng

Sun

et al. 2023

Journal of Coastal Research

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“…In this study, how the Kuroshio influences the westward propagating ISWs from the LS is investigated. However, in the SCS basin, there exist other processes (e.g., mesoscale eddies and boundary currents) that modulate the ISWs 4,31,32 . Although progress has been made by several previous studies based on theory and observations 4,28,[30][31][32] , 3D high-resolution simulations with realistic forcing would provide comprehensive insights.…”

Section: Discussionmentioning

confidence: 99%

“…However, in the SCS basin, there exist other processes (e.g., mesoscale eddies and boundary currents) that modulate the ISWs 4,31,32 . Although progress has been made by several previous studies based on theory and observations 4,28,[30][31][32] , 3D high-resolution simulations with realistic forcing would provide comprehensive insights. Moreover, note that modulation of background currents on ISWs also occurs in other regions of the ocean, such as, the Amazon shelf 33 , the Portuguese shelf 45 , the Western Iberian Shelf 46 and the Andaman Sea 47 .…”

Section: Discussionmentioning

confidence: 99%

“…Variation of ISWs in the SCS is related to the background processes, e.g., the Kuroshio 3,4,18,26-28 , mesoscale eddies [29][30][31] and the SCS western boundary current 32 . The Kuroshio intrusion accompanies variations of background current and stratification.…”

Section: Modulation Of Internal Solitary Waves By the Kuroshio In The...mentioning

confidence: 99%

“…Additionally, Li 4 used a modified two-layer model and clarified the limited effect of thermocline tilting by the Kuroshio on the internal tides. In addition to the Kuroshio in the SCS, mesoscale eddies and the SCS western boundary currents impact the ISWs by modulating wave speed 4,[29][30][31][32] . These studies deepen our understandings of ISWs in the SCS.…”

Section: Modulation Of Internal Solitary Waves By the Kuroshio In The...mentioning

confidence: 99%

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Modulation of internal solitary waves by the Kuroshio in the northern South China Sea

Chen

Cao

et al. 2023

Sci Rep

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Internal solitary waves (ISWs) in the South China Sea (SCS) are considerably modulated by the background currents. In this study, a three-dimensional high-resolution non-hydrostatic model is configured to investigate how the Kuroshio influences the generation and evolution of ISWs in the northern SCS. Three runs are conducted, including one control experiment without the Kuroshio and two sensitivity experiments with the Kuroshio in different paths. In the Luzon Strait (LS), the Kuroshio reduces the westward baroclinic energy flux radiated into the SCS, resulting in weakened ISWs. In the SCS basin, the background currents further refract the ISWs. With the leaping Kuroshio, the A-waves have longer crest lines but lower amplitudes compared with those in the control run. In contrast, the B-waves are less affected by the leaping Kuroshio. In the presence of looping Kuroshio, the wave refraction caused by the intrusion currents in the SCS basin results in the weakest amplitudes and energy but the widest crest lines of ISWs. Moreover, the energy of the A-waves exhibits double-peak structure along the crest lines. The crest lines of the B-waves extend to 19.5° N, which are more south than those in summer. These results highlight the importance of the Kuroshio on the 3D features of ISWs in the SCS.

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Refraction of the M2 internal tides by mesoscale eddies in the South China Sea

Zheng

Wang

Cao

et al. 2023

Deep Sea Research Part I: Oceanographic Research Papers

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

Cited by 16 publications

References 64 publications

Characteristics and Influencing Factors of Internal Solitary Waves in the Penghu Channel Based on Satellite Remote Sensing

Characteristics and Influencing Factors of Internal Solitary Waves in the Penghu Channel Based on Satellite Remote Sensing

Modulation of internal solitary waves by the Kuroshio in the northern South China Sea

Refraction of the M2 internal tides by mesoscale eddies in the South China Sea

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