Internal tide radiation from the Luzon Strait

Zhao, Zhongxiang

doi:10.1002/2014jc010014

Cited by 142 publications

(166 citation statements)

References 72 publications

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“…For understanding the characteristics of the internal wave spectrum, the vertical displacement of the isothermal was extracted from the time series of temperature, and then the frequency spectra of internal wave displacement at different depths were calculated and compared with Garrett and Munk (GM) spectrum in oceans (Garrett & Munk 1972, 1975 (Figure 6). Remarkable peak values of the displacement spectrum exist in diurnal and semidiurnal frequencies that are consistent with some previously reported research (Zhao, 2014). The energy level of the spectrum was larger than 10 5 m 2 /(rand/s) over the frequency band less than the semidiurnal frequency; beyond this frequency, the spectrum level was smaller than 10 5 m 2 /(rand/s), and this phenomenon occurred at all depths.…”

Section: Sea Trialsupporting

confidence: 92%

Timed Communication Buoy System: A Subsurface Mooring System for Efficient Sensor Data Recovery

Tian¹,

Deng²,

Xu³

et al. 2015

mar technol soc j

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A B S T R A C TAn ocean subsurface mooring system is an effective platform for acquiring information that would advance our understanding of essential ocean processes and impacts of climate changes. Unlike a surface mooring system, data acquired from a subsurface mooring system cannot be downloaded until the whole system is retrieved. To achieve efficient sensor data recovery, a new, low-cost subsurface mooring system named the Timed Communication Buoy System (TCBS) was designed and implemented. The TCBS is usually integrated in the main float, and designated sensor data can be downloaded by the control system using a noncontact communication method termed Inductively Coupled Link. After data acquisition, an autonomous communication float in the TCBS can be released from the main float. Upon release, the communication float rises to the sea surface and transmits sensor data by satellite communication. To evaluate the performance of the TCBS, a short-term sea trial in the South China Sea (SCS) was conducted. Seawater temperature data over 30 days were collected and analyzed. The results demonstrated valid measurements of vertical wavenumber spectrum and frequency spectrum of internal waves in the SCS. TCBS will lead to important information needed to support fundamental research to better understand the characteristics of internal wave spectrum in the SCS.

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Section: Sea Trialsupporting

confidence: 92%

Timed Communication Buoy System: A Subsurface Mooring System for Efficient Sensor Data Recovery

Tian¹,

Deng²,

Xu³

et al. 2015

mar technol soc j

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“…Our mooring observations, as well as satellite observations (Zhao, 2014) and CELT model simulations, suggest that diurnal internal tides generated in Luzon Strait propagate westward to the southwest-northeast slope on the east side of Dongsha Island, break near the bottom due to critical-supercritical reflection, and generate southwestward along-slope currents (Figure 5a). The westward traveling semidiurnal internal tides also obliquely impact the southwest-northeast slope.…”

Section: Discussionmentioning

confidence: 71%

“…In this paper, we focus on internal tides impinging on the continental slope in the northeastern South China Sea (SCS). Satellite altimeter observations have revealed that low-mode internal tides generated in Luzon Strait obliquely travel onto the continental slope on the east side of DongSha Island (Figure 1; Zhao, 2014). Satellite altimeter observations have revealed that low-mode internal tides generated in Luzon Strait obliquely travel onto the continental slope on the east side of DongSha Island (Figure 1; Zhao, 2014).…”

Section: Introductionmentioning

confidence: 99%

Deep Sea Currents Driven by Breaking Internal Tides on the Continental Slope

Xie

Liu

Zhao

et al. 2018

Geophysical Research Letters

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Mooring data collected on the continental slope of the South China Sea show that along‐slope deep sea bottom currents are generated when large spring internal tides (internal waves with tidal frequency) are observed, with the maximum velocity amplitude exceeding 0.15 m/s. The observations are consistent with predictions that near‐bottom breaking of internal waves can result in generation of along‐slope flows when these waves obliquely approach the slope. A linear internal tide model in one horizontal dimension with realistic topography and stratification is used to show that the breaking of internal tides is likely due to near‐critical reflection on the slope. Combining the mooring observations and the model simulation, an along‐slope near‐bottom transport of ~0.5 Sv is estimated. Along‐slope bottom flows caused by breaking internal waves potentially provide a significant way to deform continental slopes and affect deep water exchange between the marginal sea and open ocean.

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“…Internal waves are unevenly distributed throughout the SCS. Most of the internal waves and internal tides originate in the Luzon Strait and propagate northwestwards through the deep water zone near the Luzon Strait to the continental shelf (Guo and Chen, 2014;Klymak et al, 2006b;Lien et al, 2005;Ramp et al, 2004;Zhao, 2014;Zhao et al, 2004). Internal wave packets derived from satellite images by Zhao et al (2004) are shown in Fig.…”

Section: Microstructure Measurementsmentioning

confidence: 99%

Spatial distribution of turbulent mixing in the upper ocean of the South China Sea

2017

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Abstract. The spatial distribution of the dissipation rate (ε) and diapycnal diffusivity (κ) in the upper ocean of the South China Sea (SCS) is presented from a measurement program conducted from 26 April to 23 May 2010. In the vertical distribution, the dissipation rates below the surface mixed layer were predominantly high in the thermocline where shear and stratification were strong. In the regional distribution, high dissipation rates and diapycnal diffusivities were observed in the region to the west of the Luzon Strait, with an average dissipation rate and diapycnal diffusivity of 8.3 × 10 −9 W kg −1 and 2.7 × 10 −5 m 2 s −1 , respectively, almost 1 order of magnitude higher than those in the central and southern SCS. In the region to the west of the Luzon Strait, the water column was characterized by strong shear and weak stratification. Elevated dissipation rates (ε > 10 −7 W kg −1 ) and diapycnal diffusivities (κ > 10 −4 m 2 s −1 ), induced by shear instability, occurred in the water column. In the central and southern SCS, the water column was characterized by strong stratification and weak shear and the turbulent mixing was weak. Internal waves and internal tides generated near the Luzon Strait are expected to make a dominant contribution to the strong turbulent mixing and shear in the region to the west of the Luzon Strait. The observed dissipation rates were found to scale positively with the shear and stratification, which were consistent with the MacKinnon-Gregg model used for the continental shelf but different from the Gregg-Henyey scaling used for the open ocean.

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Internal tide radiation from the Luzon Strait

Cited by 142 publications

References 72 publications

Timed Communication Buoy System: A Subsurface Mooring System for Efficient Sensor Data Recovery

Timed Communication Buoy System: A Subsurface Mooring System for Efficient Sensor Data Recovery

Deep Sea Currents Driven by Breaking Internal Tides on the Continental Slope

Spatial distribution of turbulent mixing in the upper ocean of the South China Sea

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