| Wang Min,Liu Zhaojun,Zhu Xiaohua,Yan Xiaomei,Zhang Zhongzhe,Zhao Ruixiang. 2019. Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis. Acta Oceanologica Sinica, 38(11):1－10 |
| Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis |
| 基于HYCOM再分析数据研究琉球海流的形成与起源 |
| Received:May 12, 2018 |
| DOI：10.1007/s13131-018-1329-7 |
| Key words:origins of Ryukyu Current|subsurface velocity core|volume transport|Kuroshio|HYCOM |
| 中文关键词: 琉球海流起源 次表层流核 流量运输 黑潮 HYCOM |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41576001, 41920104006, 41776107, 41906023, 41621064, 41476020 and 41606113; the Scientific Research Fund of SIO under contract Nos JG1626, JG1621 and JT1604; the Project of State Key Laboratory of Satellite Ocean Environment Dynamics, SIO under contract Nos SOEDZZ1901, SOEDZZ1804 and SOEDZZ1806; the National Programme on Global Change and Air-sea Interaction under contract No. GASI-IPOVAI-01-02; the Zhejiang Provincial Natural Science Foundation of China under contract No. LQ17D060003. |
| Author Name | Affiliation | E-mail | | Wang Min | School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Liu Zhaojun | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Zhu Xiaohua | 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 | xhzhu@sio.org.cn | | Yan Xiaomei | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | | | Zhang Zhongzhe | College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China | | | Zhao Ruixiang | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | |
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| Abstract: |
| The origin of the Ryukyu Current (RC) and the formation of its subsurface velocity core were investigated using a 23-year (1993–2015) global Hybrid Coordinate Ocean Model (HYCOM) dataset. The volume transport of the RC comes from the Kuroshio eastward branch (KEB) east of Taiwan and part of the North Pacific Subtropical Gyre (p-NPSG). From the surface to 2 000 m depth, the KEB (p-NPSG) transport contributes 41.5% (58.5%) to the mean total RC transport. The KEB originally forms the subsurface velocity core of the RC east of Taiwan due to blockage of the subsurface Kuroshio by the Ilan Ridge (sill depth: 700 m). Above 700 m, the Kuroshio can enter the East China Sea (ECS) over the Ilan Ridge, meanwhile, the blocked Kuroshio below 700 m turns to the right and flows along the Ryukyu Islands. With the RC flowing northeastward, the p-NPSG contribution strengthens the subsurface maximum structure of the RC owing to the blockage of the Ryukyu Ridge. In the surface layer, the p-NPSG cannot form a stable northeastward current due to frequent disturbance by mesoscale eddies and water exchange through the gaps (with net volume transport into ECS) between the Ryukyu Islands. |
| 中文摘要: |
| 本文基于23年（1993-2015）的HYCOM（global Hybrid Coordinate Ocean Model）再分析数据研究了琉球海流的起源以及次表层流核的形成。经分析我们发现琉球海流起源于台湾以东黑潮东部分支（Kuroshio eastward branch，KEB）和北太平洋副热带环流的一部分（part of the North Pacific Subtropical Gyre，p-NPSG），两者对琉球海流的贡献量分别占41.5%和58.5%。次表层黑潮在宜兰海脊（海槛深度：700 m）的阻碍下向东转向形成KEB，这也是琉球海流次表层流核的源头。在700 m以浅，黑潮越过宜兰海脊进入东海，700 m以深被阻碍的黑潮沿着琉球群岛东部北上。在其北上的过程中，p-NPSG的贡献增强了琉球海流的次表层流核结构。P-NPSG无法在表层形成东北向海流是因为中尺度涡的影响以及琉球岛链间的水交换（净流量进入东海）。 |
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