| 基于HYCOM再分析数据研究琉球海流的形成与起源 |
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| 引用本文： | 汪敏,刘昭君,朱小华,闫晓梅,张钟哲,赵瑞祥.基于HYCOM再分析数据研究琉球海流的形成与起源[J].海洋学报(英文版),2019,38(11):1-10. |
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| 作者姓名： | 汪敏 刘昭君 朱小华 闫晓梅 张钟哲 赵瑞祥 |
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| 作者单位： | 卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州, 310012, 中国;海洋科技与环境学院, 大连海洋大学, 大连, 116023, 中国,海洋科技与环境学院, 大连海洋大学, 大连, 116023, 中国,海洋科技与环境学院, 大连海洋大学, 大连, 116023, 中国;卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州, 310012, 中国,海洋环流与波动重点实验室, 中国科学院海洋研究所, 青岛, 266071, 中国,College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China,海洋科技与环境学院, 大连海洋大学, 大连, 116023, 中国 |
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| 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. |
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| 摘 要： | 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(pNPSG). 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 pNPSG 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.
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| 关 键 词： | 琉球海流起源 次表层流核 流量运输 黑潮 HYCOM |
| 收稿时间： | 2018/5/12 0:00:00 |
Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis |
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| Wang Min,Liu Zhaojun,Zhu Xiaohu,Yan Xiaomei,Zhang Zhongzhe and Zhao Ruixiang.Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis[J].Acta Oceanologica Sinica,2019,38(11):1-10. |
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| Authors: | Wang Min Liu Zhaojun Zhu Xiaohu Yan Xiaomei Zhang Zhongzhe and Zhao Ruixiang |
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| Institution: | 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,State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China,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,Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China,College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China and 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. |
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| Keywords: | origins of Ryukyu Current|subsurface velocity core|volume transport|Kuroshio|HYCOM |
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