Intraseasonal Variability of the Winter Western Boundary Current in the South China Sea Using Satellite Data and Mooring Observations
Intraseasonal Variability of the Winter Western Boundary Current in the South China Sea Using Satellite Data and Mooring Observations
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利用卫星数据和系泊观测研究南海冬季西边界流的季节内变化
DOI：
10.1109/jstars.2016.2553049
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发表时间：
2016-05
影响因子：
5.5
通讯作者：
Hu Jianyu
中科院分区：
文献类型：
--
作者：
Yang Xiao-Yi;Zheng Quanan;Wang Dongxiao;Hu Jianyu
利用卫星资料和系泊观测资料研究了南海冬季西部边界流的季节内变化。东北风的季内增强增强了陆架间的海平面梯度，从而使海盆尺度的气旋环流在一周左右的时间内旋转上升。西南南海南部气旋环流进一步增强，主要受西海低压惯性再环流增强的影响。复经验正交函数分析表明，WBC下游附近的大海平面波动主要可以用两种主导模式来解释。第一个模态与风场的季节内变化有关，其空间场代表了西太平洋对源自盆地内部的西向罗斯比波的响应，而第二个模态则反映了沿西太平洋向南传播的中尺度信号。系泊观测在2004/2005年冬季记录了三次向南的WBC加速。虽然前两个可能与风力增强有关，但第三个与WBC附近的气旋涡有关。最初，该涡旋从吕宋海峡传播，在那里与黑潮入侵相关的活跃中尺度过程是南海的重要扰动源。
The intraseasonal variability of the winter western boundary current (WBC) in the South China Sea (SCS) is investigated using satellite data and mooring observations. The intraseasonal intensification of the northeasterly wind enhances the cross-shelf sea-level gradient, and, thus, causes the basin-scale cyclonic circulation to spin up within around one week. The Southern Cyclonic Gyre in the southwestern SCS further strengthens due to the intensified inertial recirculation of the WBC. Complex empirical orthogonal function analysis reveals that the large sea-level fluctuation around the downstream WBC can mainly be explained by two dominant modes. The first mode is related to intraseasonal variations of the wind field and its spatial field represents the response of the WBC to the westward Rossby waves originated from the interior basin, while the second mode reflects the southward propagation of mesoscale signals along the WBC. Mooring observations recorded the accelerations of the southward WBC three times in winter 2004/2005. While the first two could be linked to the wind intensification, the third one was associated with a cyclonic eddy closely next to the WBC. Initially, this eddy propagated from the Luzon Strait, where active mesoscale processes associated with the Kuroshio intrusion act as important disturbance sources for the SCS.
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