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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Cross-shelf water exchange in the East China Sea as estimated by satellite altimetry and in situ hydrographic measurement
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Cross-shelf water exchange in the East China Sea as estimated by satellite altimetry and in situ hydrographic measurement

机译：通过卫星测高和原位水文测量估算的东海跨架水交换

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摘要

Combining satellite altimetry and in situ hydrographic measurement, we estimated the crossshelf transport (CST) and its spatial and temporal variations across 200 m isobath in the East China Sea (ECS) from 1993 to 2014. The vertically integrated CST can be dynamically divided into three parts: surface Ekman transport, geostrophic transport, and bottom Ekman transport. The results show that the 22 year-mean, sectionally integrated CST to be 1.7±2.0 Sv (positive in the on-shelf direction), comprised of bottom and surface Ekman transports of 2.7±1.0 Sv and 0.6±0.6 Sv, respectively, that are partially offset by a geostrophic transport of -1.5±1.7 Sv. The sectionally integrated CST shows significantly high power at roughly annual period from 1999 to 2001, with lower power at intra-annual period. The vertically integrated CST to the northeast of Taiwan is the main source of sectionally integrated CST. The vertically integrated CST also shows significant variations in the 6–15 month period band to the northeast of Taiwan as well. The temporal variations of the sectionally integrated and vertically integrated CST are both controlled primarily by geostrophic transport and modulated by bottom Ekman transport. In the upper 50 m, the geostrophic current to the northeast of Taiwan exhibits large mean and significant variability. The empirical orthogonal function analysis of vertical structure of geostrophic current shows two significant modes with strong annual signal. The first mode is associated with the migration of Kuroshio axis near Taiwan, while the second mode is associated with the variation of the meander of the Kuroshio to the northeast of Taiwan.
机译：结合卫星测高和现场水文测量，我们估算了1993年至2014年东海（ECS）200 m等深线上的跨架运输（CST）及其时空变化。垂直整合的CST可以动态分为三类部分：地面埃克曼运输，地转运输和底部埃克曼运输。结果表明，22年平均，分段积分的CST为1.7±2.0 Sv（在架上方向为正），分别由底部和表面的Ekman运移组成，分别为2.7±1.0 Sv和0.6±0.6 Sv。被-1.5±1.7 Sv的地转运动部分抵消。分段集成的CST在1999年至2001年的大约每年期间显示出显着的高功率，而在年内期间显示出较低的功率。台湾东北部垂直整合的CST是分段整合CST的主要来源。垂直整合的CST在台湾东北部的6-15个月周期范围内也显示出显着变化。分段整合和垂直整合的CST的时间变化主要由地转运动控制，而由底部Ekman传输控制。在50 m的上部，台湾东北部的地转流具有较大的均值和较大的变化性。地转流垂直结构的经验正交函数分析显示出两种具有强年信号的显着模式。第一种模式与黑潮在台湾附近的迁徙有关，而第二种模式与黑潮在台湾东北部的曲折变化有关。

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