| Zheng Hua,Zhu Xiao-Hua,Nakamura Hirohiko,Park Jae-Hun,Jeon Chanhyung,Zhao Ruixiang,Nishina Ayako,Zhang Chuanzheng,Na Hanna,Zhu Ze-Nan,Min Hong-Sik. 2020. Generation and propagation of 21-day bottom pressure variability driven by wind stress curl in the East China Sea. Acta Oceanologica Sinica, 39(7):91－106 |
| Generation and propagation of 21-day bottom pressure variability driven by wind stress curl in the East China Sea |
| 东海风应力旋度驱动的21天周期的海底压力变化及其传播 |
| Received:March 06, 2020 |
| DOI：10.1007/s13131-020-1603-3 |
| Key words:pressure-recording inverted echo sounder East China Sea bottom pressure wind stress curl |
| 中文关键词: 加载压力传感器的倒置式回声仪 东海 海底压力 风应力旋度 |
| 基金项目: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. |
| Author Name | Affiliation | E-mail | | Zheng Hua | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Zhu Xiao-Hua | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China | xhzhu@sio.org.cn | | Nakamura Hirohiko | Faculty of Fisheries, Kagoshima University, Kagoshima 8900056, Japan | | | Park Jae-Hun | Department of Ocean Sciences, Inha University, Incheon 22212, Korea | | | Jeon Chanhyung | Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge 02139, USA | | | Zhao Ruixiang | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Nishina Ayako | Faculty of Fisheries, Kagoshima University, Kagoshima 8900056, Japan | | | Zhang Chuanzheng | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Na Hanna | School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea | | | Zhu Ze-Nan | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Min Hong-Sik | Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology, Busan 49111, Korea | |
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| 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. |
| 中文摘要: |
| 在2015年6月至2017年6月期间，跨越庆良间水道的由2台加载压力传感器的倒置式回声仪（PIES）和5台加载压力传感器和海流计的倒置式回声仪（CPIES）组成的观测断面获得了近2年的海底压力时间序列。该时间序列中存在着显著的21天周期的振荡（Pbot21），该信号在2016年7月至10月期间尤为强烈。Pbot21与东海陆架上的风应力旋度存在较显著的3天延迟相关，其相关系数达到0.65。本文采用正压海洋模式解释了这一信号的产生、传播以及耗散过程，模式结果显示东海陆架上的风应力旋度驱动产生Pbot21并向琉球岛链传播，而深海上的风应力旋度不能驱动产生这一信号。在陆架上，Pbot21伴随21天周期的风应力旋度由海岸向东南方向传播，但由于摩擦作用，信号在离开风场后几天内即耗散。断面能否观测到Pbot21与陆架上21天周期风应力旋度场的分布相关，长江口东南方向风应力旋度驱动的Pbot21能被观测到，而长江口东北方向产生的Pbot21不能被观测到。 |
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