Study on the vertical migration characteristics of the acoustic scattering layer under the influence of internal waves in the northern South China Sea

Bi Weichuan; Liang Chujin; Lin Feilong; Cui Zijian; Tang Junhui

doi:10.12284/hyxb2024073

Volume 46 Issue 8

Sep. 2024

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Article Navigation > Haiyang Xuebao > 2024 > 46(8): 37-49

Bi Weichuan，Liang Chujin，Lin Feilong, et al. Study on the vertical migration characteristics of the acoustic scattering layer under the influence of internal waves in the northern South China Sea[J]. Haiyang Xuebao，2024, 46(8)：37–49 doi: 10.12284/hyxb2024073

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Study on the vertical migration characteristics of the acoustic scattering layer under the influence of internal waves in the northern South China Sea

doi: 10.12284/hyxb2024073

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
School of Ocean Science, Nanjing University of Information and Technology, Nanjing 210044, China
3.
School of Ocean Science, Zhejiang University, Hangzhou 310058, China

Received Date: 2024-03-07
Rev Recd Date: 2024-06-05

Available Online: 2024-08-09

Publish Date: 2024-09-26

Abstract

Abstract

Based on the Acoustic Doppler Current Profiler carried by deep-sea moorings, we investigated the diel vertical migration of the acoustic scattering layer and the impact of internal solitary waves on it in the northern South China Sea. The observational results reveal that the acoustic scattering layer, influenced by zooplankton, ascends to shallower depth within approximately an hour after sunset, remains there throughout the night, then migrates to the deeper depth within about an hour before sunrise. The average migration velocities are 4.7 cm/s (upward) and 5.8 cm/s (downward). Additionally, internal solitary waves observed in the region induce a pair of downward and upward currents, with maximum vertical velocities exceeding 50 cm/s, leading to fluctuations of tens to hundreds of meters in the acoustic scattering layer. The acoustic backscattering strength of the ocean’s upper layer reaches its maximum value at the troughs of internal solitary waves. Further research indicates that the daytime internal solitary waves exhibit a stronger correlation between the vertical velocity and the depth-averaged backscattering strength variation compared to the nighttime internal solitary waves. When the vertical velocities induced by both types of waves are equal, the depth-averaged backscattering strength variations during the day are typically greater than those at night.
- Acoustic Doppler Current Profiler,
- internal solitary waves,
- acoustic scattering layer,
- diel vertical migration,
- South China Sea

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References

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