Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis
Origin and formation of the Ryukyu Current revealed by HYCOM reanalysis
复制标题
HYCOM 再分析揭示琉球洋流的起源和形成
DOI：
10.1007/s13131-018-1329-7
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发表时间：
2019
影响因子：
1.4
通讯作者：
Zhao Ruixiang
中科院分区：
文献类型：
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作者：
Wang Min;Liu Zhaojun;Zhu Xiaohua;Yan Xiaomei;Zhang Zhongzhe;Zhao Ruixiang
利用23年（1993-2015）全球混合坐标海洋模型（HYCOM）数据集，研究了琉球海流（RC）的起源及其地下速度核的形成。南海的体积输送来自台湾以东的黑潮东支（KEB）和北太平洋副热带环流（p-NPSG）的一部分。从地表到2 000 m深度，KEB （p-NPSG）输运占RC平均总输运的41.5%（58.5%）。外换银行最初是由于伊兰脊对地下黑潮的阻塞（基深700 m）而形成台湾东部RC的地下速度核。在700米以上，黑潮可以通过伊兰岭进入东海，而在700米以下，被阻挡的黑潮则向右转，沿琉球群岛流动。随着RC向东北移动，p-NPSG的贡献由于琉球脊的阻塞而加强了RC的地下最大构造。在表层，由于频繁受到中尺度涡旋的干扰和通过琉球群岛间隙的水交换（净体积输送到ECS）， p-NPSG不能形成稳定的东北流。
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.