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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
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Weichuan Bi1, Chujin Liang1, 2, 3, *, Feilong Lin1, Zijian Cui3, Junhui Tang1
Haiyang Xuebao | 2024, 46(8) : 37 - 49
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Haiyang Xuebao | 2024, 46(8): 37-49
• Article •
Study on the vertical migration characteristics of the acoustic scattering layer under the influence of internal waves in the northern South China Sea
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Weichuan Bi1, Chujin Liang1, 2, 3, *, Feilong Lin1, Zijian Cui3, Junhui Tang1
Affiliations
  • 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
Published: 2024-08-31 doi: 10.12284/hyxb2024073
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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
Weichuan Bi, Chujin Liang, Feilong Lin, Zijian Cui, Junhui Tang. 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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Article Info
doi: 10.12284/hyxb2024073
  • Receive Date：2024-03-07
  • Online Date：2025-11-26
  • Published：2024-08-31
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  • Received：2024-03-07
  • Revised：2024-06-05
Affiliations
    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
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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