Autumn intensification of the Ryukyu Current during 2003-2007
Autumn intensification of the Ryukyu Current during 2003-2007
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DOI：
10.1007/s11430-010-0022-2
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Xiao-hua Zhu;Daji Huang;Xinyu Guo
中科院分区：
文献类型：
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作者：
Xiao-hua Zhu;Daji Huang;Xinyu Guo
利用2003年4月至2007年6月收集的16个重复水文样带数据进行反演计算，得到了琉球北部群岛东部地区琉球海流的速度结构和体积输运（VTs）。逆计算结果表明，琉球海流以地下速度核为主，最大速度在15.1 ~ 80.0 cm/s之间，在横断面上的位置在110 ~ 600 dbar之间，在27.2°~ 28.2°N之间。平均速度显示，在326 dbar深度，地下速度核心的最大值为24.6 cm/s， VT为14.0 Sv (1 Sv≡106m3/s)，垂直尺寸为800 m，水平尺寸为60 km。季节平均流速显示，琉球流在秋季比其他季节更强。分析认为，这种季节变化与日本四国以南反气旋涡旋的增强是一致的。
Inverse calculations using data from 16 repeat hydrographic transects collected from April 2003 to June 2007 have yielded velocity structures and volume transports (VTs) of the Ryukyu Current in the region east of the northern Ryukyu Islands. The inverse calculation results show that the Ryukyu Current is dominated by a subsurface velocity core with maximum velocities from 15.1 to 80.0 cm/s, whose positions vary between 110 and 600 dbar and 27.2°–28.2°N along the transect. The mean velocity exhibits a subsurface velocity core with a maximum value of 24.6 cm/s at 326 dbar depth, a VT of 14.0 Sv (1 Sv ≡ 106m3/s), a vertical dimension of 800 m, and a horizontal dimension of 60 km. The seasonal mean velocities show that the Ryukyu Current is stronger in autumn than in other seasons. It is suggested that this seasonal variation is coincident with the intensification of the anticyclonic eddy south of Shikoku, Japan.