Slope‐Intensified Storm‐Induced Near‐Inertial Oscillations in the South China Sea

Li, Ruixiang; Chen, Changsheng; Dong, Wenjie; Beardsley, Robert C.; Wu, Zhongxiang; Liu, Yuqiang; Liu, Tongmu; Xu, Danya

doi:10.1029/2020jc016713

Cited by 13 publications

(8 citation statements)

References 38 publications

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“…Significant peaks at frequency f (about 0.705 cpd in Figure 11A) showed up indicating that strong NIWs were triggered by the typhoon in this area. Similar stormgenerated near-inertial oscillations have been reported by many studies (Hormann et al, 2014;Zhang et al, 2014;Alford et al, 2016;Li et al, 2021a;Zhang et al, 2021).…”

Section: Buoyancy Frequency and Niwssupporting

confidence: 86%

“…At the surface layer, the advection terms showed significant wave signals along the shelf break off southeastern Hainan Island on July 15 (Figure 14) and the wave signals became much stronger on July 18 and 19 with the passage of the typhoon. This kind of typhoon-induced wave has been observed frequently in the northern SCS (Sun et al, 2015;Zheng et al, 2015;Li et al, 2021a;Li et al, 2022). Li et al (2021a) found that the stormgenerated near-inertial oscillations exhibit a slope-intensified feature on the northern slope of the SCS, regardless of typhoon trajectory and intensity.…”

Section: Temperature Transport Processmentioning

confidence: 80%

“…This kind of typhoon-induced wave has been observed frequently in the northern SCS (Sun et al, 2015;Zheng et al, 2015;Li et al, 2021a;Li et al, 2022). Li et al (2021a) found that the stormgenerated near-inertial oscillations exhibit a slope-intensified feature on the northern slope of the SCS, regardless of typhoon trajectory and intensity. Su and Pohlmann (2009)…”

Section: Temperature Transport Processmentioning

confidence: 80%

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Impact of Typhoon on Coastal Upwelling Off The Eastern Hainan Island: A Case Study of Typhoon Rammasun (2014)

et al. 2022

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The Hainan Island coastal upwelling (HIU hereafter) off the eastern Hainan Island (EHI) is an important phenomenon in the northern South China Sea. Though this phenomenon has been extensively studied, the fast responses of its inner oceanic processes to typhoon passage remain unclear. Based on satellite data and a validated three-dimensional numerical model, the HIU response to the passage of Typhoon Rammasun (2014) are explored in this study. Impacted by Rammasun, the climbing of deep water off the EHI was depressed and the bottom cold water moved seaward for at least 10 km. Though the HIU was weakened, a cooling event and Chl-a bloom in the HIU were formed after the passage of Rammasun. Diagnostic analyses revealed that both advection and diffusion terms contributed to controlling the local rate of temperate change during the typhoon passage and the advection terms showed significant internal wave signals along the shelf break off southeastern Hainan Island. At the same time, strong near-inertial waves (NIWs) with 0.705 cpd were triggered in the HIU. The NIWs lasted for about two weeks and caused strong vertical mixing in the HIU after Rammasun. Overall, typhoon wind and NIWs combined to dominate temperature variation in the HIU during the typhoon period.

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Section: Buoyancy Frequency and Niwssupporting

confidence: 86%

Section: Temperature Transport Processmentioning

confidence: 80%

Section: Temperature Transport Processmentioning

confidence: 80%

See 1 more Smart Citation

Impact of Typhoon on Coastal Upwelling Off The Eastern Hainan Island: A Case Study of Typhoon Rammasun (2014)

et al. 2022

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“…The South China Sea (SCS), a marginal sea located in the northwestern Pacific Ocean, is frequently influenced by locally and western Pacific Ocean generated tropical cyclones [21]. Basic characteristics of NIWs induced by tropical cyclones in the SCS have been analyzed based on in situ observations [19,20,[22][23][24][25][26][27][28] and numerical modelling [29][30][31][32]. NIWs in the SCS are frequently modified by background relative vorticity [23,28,33,34], nonlinear wave-wave interactions [33,35,36], and internal tides [37,38].…”

Section: Introductionmentioning

confidence: 99%

“…Basic characteristics of NIWs induced by tropical cyclones in the SCS have been analyzed based on in situ observations [19,20,[22][23][24][25][26][27][28] and numerical modelling [29][30][31][32]. NIWs in the SCS are frequently modified by background relative vorticity [23,28,33,34], nonlinear wave-wave interactions [33,35,36], and internal tides [37,38].…”

Section: Introductionmentioning

confidence: 99%

Observed Near-Inertial Waves in the Northern South China Sea

Yang

Hou

2021

Remote Sensing

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Characteristics of near-inertial waves (NIWs) induced by the tropical storm Noul in the South China Sea are analyzed based on in situ observations, remote sensing, and analysis data. Remote sensing sea level anomaly data suggests that the NIWs were influenced by a southwestward moving anticyclonic eddy. The NIWs had comparable spectral density with internal tides, with a horizontal velocity of 0.14–0.21 m/s. The near-inertial kinetic energy had a maximum value of 7.5 J/m3 and propagated downward with vertical group speed of 10 m/day. Downward propagation of near-inertial energy concentrated in smaller wavenumber bands overwhelmed upward propagation energy. The e-folding time of NIWs ranged from 4 to 11 days, and the larger e-folding time resulted from the mesoscale eddies with negative vorticity. Modified by background relative vorticity, the observed NIWs had both red-shifted and blue-shifted frequencies. The upward propagating NIWs had larger vertical phase speeds and wavelengths than downward propagating NIWs. There was energy transfer from the mesoscale field to NIWs with a maximum value of 8.5 × 10−9 m2 s−3 when total shear and relative vorticity of geostrophic currents were commensurate. Our results suggest that mesoscale eddies are a significant factor influencing the generation and propagation of NIWs in the South China Sea.

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Unveiling near-inertial wave dynamics and storm-driven currents: Insights from moorings in the coastal Mediterranean Sea

Poulain

2024

Continental Shelf Research

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Slope‐Intensified Storm‐Induced Near‐Inertial Oscillations in the South China Sea

Abstract: Near-inertial oscillations (NIOs) are commonly observed in the ocean as responses to a sudden change of the wind direction during passages of either cold fronts or tropical cyclones (

Cited by 13 publications

References 38 publications

Impact of Typhoon on Coastal Upwelling Off The Eastern Hainan Island: A Case Study of Typhoon Rammasun (2014)

Impact of Typhoon on Coastal Upwelling Off The Eastern Hainan Island: A Case Study of Typhoon Rammasun (2014)

Observed Near-Inertial Waves in the Northern South China Sea

Unveiling near-inertial wave dynamics and storm-driven currents: Insights from moorings in the coastal Mediterranean Sea

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