文章基本信息

标题：Tempo-spatial variations of the Ryukyu Current southeast of Miyakojima Island determined from mooring observations
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作者：Ruixiang Zhao ; Hirohiko Nakamura ; Xiao-Hua Zhu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
页码：1-10
DOI：10.1038/s41598-020-63836-5
出版社：Springer Nature
摘要：The origin, structure, and variability of the Ryukyu Current (RC) have long been debated, mostly due to limited observations. A mooring array, deployed for two years southeast of Miyakojima in the southern portion of the Ryukyu Island chain, has provided, for the first time, data confirming the existence and revealing the characteristics of the RC in that upstream region, including its velocity structure and variability. The observations show a shoreward-intensified current flowing northeastward, with a subsurface core located near the 1,000 m isobath and having a record-long mean speed of up to 19.4 cm s−1 at 500 m depth. Estimated volume transport across the observation section had mean 9.0 Sv (1 Sv = 106 m3 s−1) and standard deviation 8.7 Sv. The RC shows significant barotropic character compared with other similar mid-latitude currents.