| SHEN Junqiang,QIU Yun,GUO Xiaogang,PAN Aijun,ZHOU Xiwu.The spatio-temporal variation of wintertime subtidal currents in the western Taiwan Strait[J].Acta Oceanologica Sinica,2017,36(11):4-13 |
| 台湾海峡西部冬季余流的时空变化 |
| The spatio-temporal variation of wintertime subtidal currents in the western Taiwan Strait |
| 投稿时间：2017-03-27 修订日期：2017-05-04 |
| DOI：10.1007/s13131-017-1120-1 |
| 中文关键词: 逆风流 中国沿岸流 M2分潮流 台湾海峡 冬季 |
| 英文关键词:counter-wind current China coastal current M2 tidal current Taiwan Strait winter season |
| 基金项目: |
| 作者 | 单位 | E-mail | | 沈俊强 | 国家海洋局第三海洋研究所, 海洋动力学实验室, 厦门, 361005 | | | 邱云 | 国家海洋局第三海洋研究所, 海洋动力学实验室, 厦门, 361005
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | qiuyun@tio.org.cn | | 郭小钢 | 国家海洋局第三海洋研究所, 海洋动力学实验室, 厦门, 361005 | | | 潘爱军 | 国家海洋局第三海洋研究所, 海洋动力学实验室, 厦门, 361005 | | | 周喜武 | 国家海洋局第三海洋研究所, 海洋动力学实验室, 厦门, 361005 | |
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| 中文摘要: |
| 本研究利用一组新的船载ADCP和3个持续40天的锚系ADCP观测数据，揭示冬季台湾海峡西部潮流及余流时空变化特征。结果表明M2分潮流在25°N以北位置确实存在等潮时线密集区，而该分潮流在研究海域内并不存在圆流点。此外，在余流方面，研究表明在冬季风松弛阶段，逆风流能够穿越整个海峡西部，并占据整条水柱；然而在2007年两次季风盛行事件下，上述逆风流在同样位置却完全被顺风的中国沿岸流所阻断，相应地中国沿岸水南下占据整个海峡西部。最重要的是本研究发现上述两支海流在海峡西部的时空变化特征可采用矢量经验正交函数（VEOF）对应的前两个模态进行解析：即第一模态对应的风驱准正压流起主导作用，而第二模态对应的相对较弱的一阶背景斜压流起调制作用。 |
| 英文摘要: |
| A new data set of observations by six cruises of ship-mounted acoustic doppler current profiler (SADCP) and three 40 d long bottom-mounted ADCPs (BADCPs) is employed to reveal the spatiotemporal variability of tidal and subtidal currents in the western Taiwan Strait (TWS) during winter season. The results confirm the existence of intense cotidal lines for M2 tidal current, which is located north of 25°N. In this case, no existence of an amphidromic point can be identified. It is also revealed that the counter-wind current (CWC) can extend through the whole western TWS and even occupy the entire water column during winter monsoon relaxation. However, this CWC is observed to be thoroughly overwhelmed by the downwind China coastal current (CCC) during the two big monsoon bloom events in the winter of 2007, and the CCC consequently extends southward throughout the western TWS instead. Most importantly, the variation of the spatial extent for the CWC and the CCC in the western TWS is found to be well explained by the first two modes of the vector empirical orthogonal function (VEOF) analysis, that is, it is mainly controlled by a wind-driven quasi barotropic current as the first mode and slightly modulated by a relatively weak background current with a first-order baroclinic structure as the second mode. |
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