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An observational study of the Kuroshio in the East China Sea: Local, regional, and basin-wide perspectives on a western boundary current.

机译：东海黑潮观测研究：对西部边界流的局部，区域和盆地范围的观点。

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摘要

The Kuroshio is the western boundary current of the North Pacific mid-latitude gyre. An observational study of the Kuroshio was conducted using data collected in the East China Sea (ECS) north of Okinawa from December 2002 through November 2004 with an array of inverted echo sounders and acoustic Doppler current profilers. Using these data, Kuroshio velocity structure and transport time series were obtained. Net absolute transport ranges between 4 and 29 Sv and has spectral peaks at periods of 60, 15 and 11 days. The mean net absolute transport is 18.5 +/- 0.8 Sv. In conjunction with these in situ measurements, satellite altimeter data were used to extend the Kuroshio transport time series back to 1993. Comparison with net Ryukyu Current transport southeast of Okinawa shows that their mean sum (24 Sv), is less than the mean predicted Sverdrup transport. Additionally, Kuroshio and Ryukyu Current transports are positively correlated, with 60 day lag, due to the effect of mesoscale eddies impinging on the Kerama Gap. Finally, annually-averaged Kuroshio and Ryukyu Current transports correlate positively with the Pacific Decadal Oscillation (PDO) index. The correlations, r, which are highest at zero lag, are 0.76 for the Kuroshio and 0.49 for the Ryukyu Current. The combined transport variation correlated with PDO index variation is about 4 Sv. PDO index is strongly negatively correlated with NCEP wind stress curl over the central North Pacific at 20°-30°N.
机译：黑潮是北太平洋中纬度环流的西边界流。对黑潮的观测研究是利用2002年12月至2004年11月在冲绳以北的东海（ECS）收集的数据，采用一系列倒置回波测深仪和声学多普勒电流剖面仪进行的。利用这些数据，获得了黑潮速度结构和运输时间序列。净绝对输运范围在4至29 Sv之间，并在60、15和11天期间具有光谱峰值。平均净绝对迁移率为18.5 +/- 0.8 Sv。结合这些原位测量结果，使用卫星高度计数据将黑潮的运输时间序列扩展到了1993年。与琉球净净流的比较冲绳东南部的当前运输表明，其平均总和（24 Sv）小于平均预测的Sverdrup运输。此外，由于中尺度涡旋影响到了喀拉马峡，黑潮和琉球的电流输运呈正相关，相差60天。最后，每年平均的黑潮和琉球电流传输与太平洋年代际振荡（PDO）指数呈正相关。相关性r在零滞后处最高，对于黑潮来说是0.76，对于琉球潮流来说是0.49。与PDO指数变化相关的组合运输变化约为4 Sv。 PDO指数与北太平洋中部20°-30°N处的NCEP风应力卷曲强烈负相关。

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  • 作者

    Andres, Magdalena.;

  • 作者单位

    University of Rhode Island.;

  • 授予单位 University of Rhode Island.;
  • 学科 Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 136 p.
  • 总页数 136
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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