The forcing mechanism leading to the Kuroshio intrusion into the South China Sea
The forcing mechanism leading to the Kuroshio intrusion into the South China Sea
复制标题
DOI：
10.1029/2012jc007968
复制
发表时间：
2012-07
影响因子：
--
通讯作者：
Chau‐Ron Wu;Y. Hsin
中科院分区：
文献类型：
--
作者：
Chau‐Ron Wu;Y. Hsin
[1]本文利用一个高分辨率的数值模式研究了黑潮入侵南海的强迫机制。人们普遍认为，黑潮入侵的变化与南海内外的风密切相关。进行了一系列的实验，以确定风相关的强迫调节入侵。实验表明，南海内部风的重要性大于南海外部风的重要性。此外，冬季东北风引起的西北向埃克曼漂流，加强了吕宋海峡上游黑潮的活动，增强了黑潮对南海的入侵。特别是台湾西南外海的风应力旋度（WSC）是黑潮入侵的主要原因。WSC和入侵都表现出季节和季节内变化。当台湾西南外海的负WSC变强时，对反气旋环流有贡献。反气旋环流的增强有助于黑潮入侵的发展。黑潮入侵与台湾西南外海水沙流量变化的一致性表明，台湾西南外海水沙流量对黑潮入侵的变化至关重要。
[1] We use a high-resolution numerical model to examine the forcing mechanism responsible for Kuroshio intrusion into the South China Sea (SCS). The collective wisdom is that variations in Kuroshio intrusion are closely related to the wind, inside or outside the SCS. A series of experiments was performed to identify the wind-related forcing regulating the intrusion. The experiments demonstrated that the importance of wind inside the SCS is greater than that outside the SCS. Furthermore, the northwestward Ekman drift due to northeasterly wind in winter intensifies the upstream Kuroshio in the Luzon Strait, enhancing the Kuroshio intrusion into the SCS. In particular, the wind stress curl (WSC) off southwest Taiwan is chiefly responsible for the Kuroshio intrusion. Both the WSC and intrusion show both seasonal and intraseasonal variation. As the negative WSC off southwest Taiwan becomes stronger, it contributes to anticyclonic circulation. The enhanced anticyclonic circulation helps the development of the Kuroshio intrusion. The consistency between WSC variability and the intrusion suggests that the WSC off southwest Taiwan is essential to the Kuroshio intrusion variability.