Sub-seasonal variability of Luzon Strait Transport in a high resolution global model
Sub-seasonal variability of Luzon Strait Transport in a high resolution global model
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DOI：
10.1007/s13131-010-0032-0
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发表时间：
2010-07
影响因子：
1.4
通讯作者：
Zhengguang Zhang;Wei Zhao;Qinyu Liu
中科院分区：
文献类型：
--
作者：
Zhengguang Zhang;Wei Zhao;Qinyu Liu
吕宋海峡是黑潮影响南海环流的主要通道。利用1997-2007年高度计资料和2005-2006年全球高分辨率HYCOM模式输出资料分析，吕宋海峡总输运具有明显的亚季节振荡，典型周期为90 - 120 d，进入南海的平均值为1.9 Sv。进一步的谱分析表明，不同深度的地表温度的时间变化有显著差异。在上层（0-300 m），向西向入流具有明显的季节和亚季节变化。在底层（1200 m以下），向东的出流具有明显的季节变化，同时也存在明显的亚季节变化。在中层，向西向入流略大于东向出流，两者都有明显的季节和亚季节变化。由于向西流入和向东流出的季节变化相反，中间层总输送量呈现出明显的50-150天变化，没有明显的季节信号。西太平洋90 ~ 120天周期的向西Rossby波与吕宋海峡输送有很好的相关性，表明向西Rossby波与黑潮的相互作用可能是LST季节变化的机制。
The Luzon Strait is the main impact pathway of the Kuroshio on the circulation in South China Sea (SCS). Based on the analysis of the 1997–2007 altimeter data and 2005–2006 output data from a high resolution global HYCOM model, the total Luzon Strait Transport (LST) has remarkable subseasonal oscillations with a typical period of 90 to 120 days, and an average value of 1.9 Sv into SCS. Further spectrum analysis shows that the temporal variability of the LST at different depth is remarkable different. In the upper layer (0–300 m), westward inflow has significant seasonal and subseasonal variability. In the bottom layer (below 1 200 m), eastward outflow exhibits remarkable seasonal variability, while subseasonal variability is also clear. In the intermediate layer, the westward inflow is slightly bigger than the eastward outflow, and both of them have obvious seasonal and subseasonal variability. Because the seasonal variation of westward inflow and eastward out-flow is opposite, the total transport of intermediate layer exhibits significant 50–150 days variation, without obvious seasonal signals. The westward Rossby waves with a period of 90 to 120 days in the Western Pacific have very clear correlationship with the Luzon Strait Transport, this indicates that the interaction between these westward Rossby waves and Kuroshio might be the possible mechanism of the subseasonal variation of the LST.