摘要
Analysis both based on the wind stress and ocean assimilation dataset shows that the interannual variability of the Indonesian Throughflow and the South China Sea (Luzon Strait) Throughflow is out of phase. Wind anomaly forcing in the equatorial Pacific plays an important role in setting up this phase relation. During El Ni o events, the westerly wind bursts intensify the Northern Equator Current and induce a northward shift of its bifurcation point. As a result, the partition of volume transport between the Kuroshio and the Mindanao Current is changed, with the Kuroshio transport decreased and the Mindanao Current increased. The undershooting/overshooting phenomena occur at the Luzon Strait and the Sulawesi-Mindanao passage, caused by variability of these two currents. Water transport from the Pacific to the South China Sea increases with the Kuroshio transport decreased, and transport from the Pacific to the Indian Ocean decreases with the Mindanao Current transport increased. The situation is reversed during La Ni a. Therefore, the ocean dynamic meaning is profound to study the interannual variability relationship between the Indonesian Throughflow and the Luzon Strait Throughflow.
Analysis both based on the wind stress and ocean assimilation dataset shows that the interannual variability of the Indonesian Throughflow and the South China Sea （Luzon Strait） Throughflow is out of phase. Wind anomaly forcing in the equatorial Pacific plays an important role in setting up this phase relation. During El NiSo events, the westedy wind bursts intensify the Northern Equator Current and induce a northward shift of its bifurcation point. As a result, the partition of volume transport between the Kuroshio and the Mindanao Current is changed, with the Kuroshio transport decreased and the Mindanao Current increased. The undershooting/overshooting phenomena occur at the Luzon Strait and the Sulawesi-Mindanao passage, caused by variability of these two currents. Water transport from the Pacific to the South China Sea increases with the Kuroshio transport decreased, and transport from the Pacific to the Indian Ocean decreases with the Mindanao Current transport increased. The situation is reversed during La Nina. Therefore, the ocean dynamic meaning is profound to study the interannual variability relationship between the Indonesian Throughflow and the Luzon Strait Throughflow.
基金
Acknowledgements The authors are grateful to Dr. X. E Meng in 0cean University of China for his help in computing the ＂Island Rule＂, and also to Dr. T. D. Qu in International Pacific Research Center for helpful discussion on this work. This work was supported by the National Natural Science Foundation of China （Grant Nos. 40136010 ＆ 40520140074）, and the Knowledge Innovation Program of the Chinese Academy of Sciences （Grant No. kzcx3-sw-227）.
关键词
印度尼西亚通流
南海通流
相互作用
水交换
洋流
印度洋
太平洋
Indonesian thronghflow, South China Sea （Luzon Strait）Thronghflow, undershooting/overshooting.
作者简介
Correspondence should be addressed to Liu Qinyan （email：qyliu66@ scsio.ac.cn）
