Insight Into the Dynamics of the Radiating Internal Tide Associated With the Kuroshio Current

Xu, Zhenhua; Wang, Yang; Liu, Zhiqiang; McWilliams, James C.; Gan, Jianping

doi:10.1029/2020jc017018

Cited by 42 publications

(21 citation statements)

References 62 publications

(93 reference statements)

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“…Incoherent ITs are caused by a non-linear interaction between varying background conditions and internal wave motions (Xu et al, 2016). Furthermore, the HKE of incoherent ITs can reflect the interaction between the background field and ITs (van Haren, 2004;Alford et al, 2015;Xu et al, 2021). Through harmonic analysis of the ITs, we can extract the coherent ITs, those with astronomical tide frequencies.…”

Section: Semidiurnal Itsmentioning

confidence: 99%

High-Frequency Motions in the Southeastern South China Sea During Winter–Spring 2018/2019

Zhang

Vetter

et al. 2021

Front. Mar. Sci.

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High-frequency motions in the southeastern South China Sea (SCS) have rarely been investigated due to sparse field observations. The vertical distribution and temporal variation of internal tides (ITs) and near-inertial waves (NIWs) near the Nansha area in the southeastern SCS were studied using a mooring current dataset from December 2018 to June 2019 in this study. Results showed that ITs were mainly dominated by O1, K1, and M2. Tidal energy analysis indicates that the diurnal ITs were the most energetic components, followed by the semidiurnal ITs. Modal decomposition reveals that diurnal ITs were dominated by mode-3, rather than mode-1, as reported by previous studies. The horizontal kinetic energy (HKE) of diurnal ITs fluctuated within a limited range, almost unaffected by the background field. However, the HKE of semidiurnal ITs was dominated by mode-1 and more affected by the background field, especially at the end of March. Most observations showed the phase of the NIWs propagating upward and the energy propagating downward. During the northeast monsoon period, the near-inertial energy had a large magnitude due to strong wind forcing. In addition, the near-inertial energy peaked from the middle of March to the beginning of April because of the input of NIWs from afar. Overall, near-inertial energy was found concentrated above a 500–600 m depth in the southeastern SCS.

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Section: Semidiurnal Itsmentioning

confidence: 99%

High-Frequency Motions in the Southeastern South China Sea During Winter–Spring 2018/2019

Zhang

Vetter

et al. 2021

Front. Mar. Sci.

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“…According to the average buoyancy frequency N = 6 cph, the magnitude order of the average diffusivity is O(10 −4 )-O(10 −3 ) m 2 s −1 and is consistent with our result. Yang et al (2014) observed diapycnal mixing on the continental shelf and slope and found that the average diffusivity can reach O(10 −3 ) m 2 s −1 too. Similar results have been reported in the study of internal solitary waves shoaling in other regions.…”

Section: Enhanced Diapycnal Mixing Induced By the Polarity Reversal Of Internal Solitary Wavesmentioning

confidence: 99%

“…Laurent, 2008). Observations show that high turbulence mainly occurs in the continental shelf region, and the average diffusivity can reach O(10 −3 ) m 2 s −1 , while the diffusivity in the continental slope region is 1 order of magnitude lower (Yang et al, 2014). When nonlinear internal waves travel cross the continental slope, their waveform changes into different types (Terletska et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Enhanced diapycnal mixing with polarity-reversing internal solitary waves revealed by seismic reflection data

Gong

Song

Zhao

et al. 2021

Nonlin. Processes Geophys.

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Abstract. Shoaling internal solitary waves near the Dongsha Atoll in the South China Sea dissipate their energy and enhance diapycnal mixing, which have an important impact on the oceanic environment and primary productivity. The enhanced diapycnal mixing is patchy and instantaneous. Evaluating its spatiotemporal distribution requires comprehensive observation data. Fortunately, seismic oceanography meets the requirements, thanks to its high spatial resolution and large spatial coverage. In this paper, we studied three internal solitary waves in reversing polarity near the Dongsha Atoll and calculated their spatial distribution of diapycnal diffusivity. Our results show that the average diffusivities along three survey lines are 2 orders of magnitude larger than the open-ocean value. The average diffusivity in internal solitary waves with reversing polarity is 3 times that of the non-polarity reversal region. The diapycnal diffusivity is higher at the front of one internal solitary wave and gradually decreases from shallow to deep water in the vertical direction. Our results also indicate that (1) the enhanced diapycnal diffusivity is related to reflection seismic events, (2) convective instability and shear instability may both contribute to the enhanced diapycnal mixing in the polarity-reversing process, and (3) the difference between our results and Richardson-number-dependent turbulence parameterizations is about 2–3 orders of magnitude, but its vertical distribution is almost the same.

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“…15 of 20 ations are relatively large. These large standard deviations have resulted from the effects of seasonal changes of internal tides and variable pathways influenced by Kuroshio and mesoscale eddies (Alford et al, 2015;Huang et al, 2018;Xu et al, 2021).…”

Section: 1029/2021jc017878mentioning

confidence: 99%

Internal Wave Imprints on Temperature Fluctuations as Revealed by Rapid‐Sampling Deep Profiling Floats

et al. 2021

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The two-decade Argo array has been the most successful ocean observation network in the 21st century. Nearly 4,000 profiling floats, covering the ice-free oceans, have sustained continuous observations of temperature and salinity from the sea surface to 2,000 m and provided unprecedented data distributed in the global ocean (Roemmich, Alford, et al., 2019). Over 2 million profiles of upper ocean measurements have significantly broadened our scopes of multiscale oceanic processes (

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Insight Into the Dynamics of the Radiating Internal Tide Associated With the Kuroshio Current

Cited by 42 publications

References 62 publications

High-Frequency Motions in the Southeastern South China Sea During Winter–Spring 2018/2019

High-Frequency Motions in the Southeastern South China Sea During Winter–Spring 2018/2019

Enhanced diapycnal mixing with polarity-reversing internal solitary waves revealed by seismic reflection data

Internal Wave Imprints on Temperature Fluctuations as Revealed by Rapid‐Sampling Deep Profiling Floats

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