| ZHANG Zhengguang,ZHAO Wei,LIU Qinyu. 2010. Sub-seasonal variability of Luzon Strait Transport in a high resolution global model. Acta Oceanologica Sinica, (3):9－17 |
| 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 |
| Received:July 17, 2009 Revised:December 18, 2009 |
| DOI：10.1007/s13131-010-0032-0 |
| Key words:Luzon Strait Transport subseasonal variability Rossby waves |
| 中文关键词: Luzon Strait Transport subseasonal variability Rossby waves |
| 基金项目:The Ministry of Science and Technology of China (National Key Program for Developing Basic Science) under contract No. 2007CB411803; the National 863 High-tech Program under contract No. 2008AA09A402. |
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| Abstract: |
| 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 outflow 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. |
| 中文摘要: |
| 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 outflow 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. |
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