中文摘要：

季节并且在到台湾的西方的南部的台湾海峡的表面水流的 interannual 变化变浅被使用高频率(HF ) 的大小调查从 2006 年 1 月的地面波浪雷达到 2009 年 4 月。结果表明那表面在到台湾的西方的水隧道的水流变浅由一个重要、季节地波动的部件组成并且一相对稳定向北方部件。由东亚季风强迫了，表面的年度变化沿岸的电流线性地与沿岸的风被相关。向北方在季节的信号后面是一个马厩有 O (10 cm/s ) 的速度的流动。观察也证明在区域的表面水流服从于不同 interannual 变化，并且向南方的表面流动比在另外的冬季在冬季 2007/2008 是更深刻的。从装底部的 ADCP 的观察也显示在那冬季，在台湾海峡的西方方面的沿岸的水流与以前的冬季很不同。向北方，流动显得弱得多，水流在大多数层是向南方的，并且 interannual 差别在整个水列被观察。在一样的时期的水道学的观察建议 Zhe-Min 沿海的水的大规模向南方的侵入是 interannual 差别的直接原因。东方亚洲季风的改进在 2007/2008 La Ni 期间 ? 一个事件在学习区域为冬季水流异例被看作主要原因。

英文摘要：

Seasonal and interannual variations of surface currents in the southern Taiwan Strait to the west of Taiwan Shoals were investi- gated by using measurements of high frequency （HF） ground wave radars from January 2006 to April 2009. The results demon- strate that surface currents in the water channel to the west of Taiwan Shoals are composed of a significant, seasonally fluctuat- ing component and a relatively stable northward component. Forced by the East Asia monsoon, the annual variation of the sur- face longshore current is linearly correlated with the longshore wind. Behind the seasonal signal is a stable northward flow with speeds of O （10 crn/s）. The observations also show that surface currents in the area are subject to distinct interannual variation, and the southward surface flow was more profound in winter 2007/2008 than in other winters. Observations from bot- tom-mounted ADCP also indicated that, in that winter, longshore currents in the west side of the Taiwan Strait are very different from the previous winter. The northward flow appeared much weaker, the currents were southward in most layers, and the in- terannual differences were observed throughout the water column. Hydrographic observations in the same period suggest that the large-scale southward intrusion of the Zhe-Min coastal water is the direct cause of the interannual difference. The enhance- ment of the East Asian monsoon during the 2007/2008 La Nifia event is considered as the main reason for the winter current anomalies in the study area.