Wintertime Variability of Currents in the Southwestern Taiwan Strait

Wang, Li; Pawlowicz, Rich; Wu, Xiongbin; Yue, Xianchang

doi:10.1029/2020jc016586

Cited by 10 publications

(7 citation statements)

References 63 publications

(94 reference statements)

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“…The subtidal-period eastward flow tends to be compensated by the relaxation process of the wind, and there is a short lag in the flow direction change relative to the wind direction change. When the easterly wind strengthens again, fu quickly trends towards a negative phase, in accordance with the results of Wang et al (2021) for the Taiwan Strait. The period of the subtidal oscillations is likely related to the tidal period, as determined by comparing it with the local tidal cycles (Figure 3).…”

Section: Wind Forcingsupporting

confidence: 88%

“…Momentum balance analysis is performed in both the x-direction (parallel to the banks) and y-direction (perpendicular to the banks) within the interior of the QS, while considering the motion equation. The methodologies of Shi et al (2002); Jiang (2018); Wang et al (2021), andHench et al (2002) were comprehensively utilised, leading to the derivation of horizontal momentum equations in both directions (as shown in Equation 2 and Equation 3):…”

Section: Potential Interannual Variabilitymentioning

confidence: 99%

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Dynamics of currents in the Qiongzhou strait during spring and summer based on a numerical simulation

Zheng,

Wang,

et al. 2024

Front. Mar. Sci.

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A high-precision three-dimensional hydrodynamic model based on the Semi-implicit Cross-scale Hydroscience Integrated System Model (SCHISM) was constructed to investigate the characteristics of residual currents in the Qiongzhou Strait during spring and summer. Results reveal an overall westward transport in the strait during spring and summer. However, the results also support the potential occurrence of transient eastward Eulerian residual currents, which should be evident predominantly at the surface in the central and eastern sections of the strait and mainly characterised by subtidal oscillations. The direction and intensity of these residual currents indicate a pronounced influence of pressure gradient forces on both sides of the strait. The eastward flow observed in spring may represent a compensatory mechanism resulting from the relaxation period of long-term easterly winds, whereas the generation of eastward residual currents in summer is influenced by wind stress curl differences in both the western and eastern areas of the strait. The direct impact of the summer monsoon on the flow field in the strait is relatively weak. Additionally, the direction and intensity of the residual currents in the strait exhibit potential interannual variations that are directly associated with interannual wind variations. This study provides valuable insights in relation to the ongoing discourse on the dynamics of residual currents in the Qiongzhou Strait.

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Section: Wind Forcingsupporting

confidence: 88%

Section: Potential Interannual Variabilitymentioning

confidence: 99%

Dynamics of currents in the Qiongzhou strait during spring and summer based on a numerical simulation

Zheng,

Wang,

et al. 2024

Front. Mar. Sci.

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“…High frequency (HF) radar currents have a wide range of applications, including ocean dynamic process studies, tsunami warnings, search and rescue, model assimilation, and oil spill and sea-ice monitoring [1,2,3]. However, the accuracy of currents vary depending on the location and time within the detection range.…”

Section: Introductionmentioning

confidence: 99%

A Scheme for Credibility of Surface Currents Derived From High Frequency Radars

Wang,

Wu,

2024

J. Phys.: Conf. Ser.

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Large amount of real-time ocean currents measured by HF radar have been included into the ocean observation database in many countries and regions, in support of applications for various marine activities such as marine research, Oil spill detection, tsunami warning, search and rescue. However, due to the performance of inversion algorithms and radar antennas, and other reasons, there are differences in the credibility of ocean current results at different times and locations, which brings on difficulties to applications of ocean currents. This letter proposes a method for developing a credibility model of ocean current results, mainly for all-digital multi-input and multi-output (MIMO) HF radar. By comparing the model with field experimental results, it is confirmed that the method is feasible. It will be very beneficial for radar users to select and use ocean current results, greatly reducing the work of verification of newly installed radars, and will be an innovation in the application technology of over-the-horizon marine radars.

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“…This complex seabed topography and coastline make the flow field structure in the strait area more complicated (Bai et al ., 2014). The Taiwan Strait has a large tidal current, strong local wind, and three interacting circulation systems propagating from the South China Sea, East China Sea, and Luzon Strait (Li et al ., 2021). As a funnel-shaped, deep-water channel located in the SE of the Taiwan Strait and sandwiched between the Penghu Islands and Taiwan Island, the Penghu Channel has the characteristics of large water depth, flat valley bottom, steep slope on both sides, and southward valley mouth.…”

Section: Introductionmentioning

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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Wintertime Variability of Currents in the Southwestern Taiwan Strait

Cited by 10 publications

References 63 publications

Dynamics of currents in the Qiongzhou strait during spring and summer based on a numerical simulation

Dynamics of currents in the Qiongzhou strait during spring and summer based on a numerical simulation

A Scheme for Credibility of Surface Currents Derived From High Frequency Radars

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

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