Generation and propagation of 21-day bottom pressure variability driven by wind stress curl in the East China Sea

Abstract

Between June 2015 and June 2017, two pressure-recording inverted echo sounders (PIESs) and five current and pressure-recording inverted echo sounders (CPIESs) deployed along a section across the Kerama Gap acquired a dataset of ocean bottom pressure records in which there was significant 21-day variability (Pbot21). The Pbot21, which was particularly strong from July-December 2016, was coherent with wind stress curl (WSC) on the continental shelf of the East China Sea (ECS) with a squared coherence of 0.65 for a 3-day time lag. A barotropic ocean model demonstrated the generation, propagation, and dissipation of Pbot21. The modeled results show that the Pbot21 driven by coastal ocean WSC in the ECS propagated toward the Ryukyu Island Chain (RIC), while deep ocean WSC could not induce such variability. On the continental shelf, the Pbot21 was generated nearly synchronously with the WSC from the coastline to the southeast but dissipated within a few days due to the effect of bottom friction. The detection of Pbot21 by the moored array was dependent on the 21-day WSC patterns on the continental shelf. The Pbot21 driven southeast of the Changjiang Estuary by the WSC was detected while the Pbot21 generated northeast of the Changjiang Estuary was not.

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Acknowledgements

In the deployment and recovery of instruments, we acknowledge the support and assistance of the captain, crew, scientists, supporting staff, and technicians aboard the T/V Kagoshimamaru of Kagoshima University.

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Correspondence to Xiao-Hua Zhu.

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Foundation item: The SIO group was supported by the National Natural Science Foundation of China under contract Nos 41920104006, 41806020, 41776107 and 41906024; the National Programme on Global Change and Air-Sea Interaction under contract No. GASIIPOVAI-01-02; the Scientific Research Fund of SIO under contract Nos JZ2001 and JT1801; the Project of State Key Laboratory of Satellite Ocean Environment Dynamics, SIO under contract Nos SOEDZZ1901 and SOEDZZ1903; the Kagoshima University group was supported by Core Research for Evolutional Science and Technology of the Japan Science and Technology Corporation and by JSPS KAKENHI under contract Nos JP15H05821 and JP15H03725; Jae-Hun Park, Hanna Na and Hong-Sik Min were supported by the “Study on Air-Sea Interaction and Process of Rapidly Intensifying Typhoon in the Northwestern Pacific” project funded by the Ministry of Oceans and Fisheries, Korea.

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Zheng, H., Zhu, XH., Nakamura, H. et al. Generation and propagation of 21-day bottom pressure variability driven by wind stress curl in the East China Sea. Acta Oceanol. Sin. 39, 91–106 (2020). https://doi.org/10.1007/s13131-020-1603-3

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Key words

  • pressure-recording inverted echo sounder
  • East China Sea
  • bottom pressure
  • wind stress curl