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利用2006年1月～2009年4月间的高频地波雷达观测分析了台湾海峡南部浅滩以西区域表层海流的季节与年际变化特征.结果表明,台湾浅滩西侧水道的表层海流主要由明显的季节波动分量和相对稳定的北向常流两部分组成.受季风的影响,表层顺岸流速的周年变化与风速之间存在明显的线性关系.在季节信号的背后则存在一支大约10 cm/s量级的稳定的北向常流.观测还表明,研究海域表层海流有明显的年际差异,2007/2008年冬季表层南向流明显比其他年份增强.锚系海床基ADCP海流剖面观测亦表明该年冬季台湾海峡西侧顺岸流与2006/2007年冬季不同,北向流明显减弱,各观测水层多为南向流,年际差异贯穿整个水柱.同期的水文观测表明闽浙沿岸水的大规模南侵是造成上述年际差异的直接原因.2007/2008年La Ni a事件导致东亚冬季风增强应是造成研究海域冬季流场异常的主因.
The seasonal and interannual variability of the surface currents in the western part of the Taiwan Strait to the west of Shoal was analyzed using high frequency ground wave radar observations from January 2006 to April 2009. The results show that the surface currents in the channels on the west side of the Taiwan Shoal are mainly marked by the obvious And the relatively stable northward normal flow.According to the monsoon, there is a clear linear relationship between annual variation of surface flow velocity and wind speed.At the back of the seasonal signal, there is an area of about 10 cm / s. The observation also shows that there are obvious interannual differences in the surface currents in the study area, and the southward surface currents in the winter of 2007/2008 are significantly enhanced compared with other years. The observation of the seabed-based ADCP ocean current profile The results show that on the west coast of the Taiwan Strait in winter, different from that in the winter of 2006/2007, the northward flow is obviously weakened, and the observed water layer is mostly southward flow, with the interannual differences throughout the water column. The large-scale southward invasion is the direct cause of the above-mentioned inter-annual differences.The increase of winter monsoon in East Asia caused by La Ni a incident in 2007/2008 should be the main cause of abnormal winter flow field in the study area.