Cite this paper:
QI Jifeng, YIN Baoshu, XU Zhenhua, LI Delei. Spatiotemporal variations of the surface Kuroshio east of Taiwan Island derived from satellite altimetry data[J]. HaiyangYuHuZhao, 2018, 36(1): 77-91

Spatiotemporal variations of the surface Kuroshio east of Taiwan Island derived from satellite altimetry data

QI Jifeng1, YIN Baoshu1,2, XU Zhenhua1, LI Delei1
1 Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences and Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
Spatiotemporal variation of the surface Kuroshio east of Taiwan Island is investigated by quantitatively analyzing 23-year (1993-2015) sea surface Absolute Dynamic Topography data. The annual mean state of the Kuroshio is shown, with a flow width~136 km and surface transport~7.75×104 m2/s. The corresponding standard deviations of these are 28 km and 2.14×104 m2/s. Results of power spectrum analysis indicate that the primary periods of Kuroshio surface transport east of Taiwan Island are 1 and 2.8 years, respectively. Spatially, the Kuroshio surface transport southeast of Taiwan Island has greater variability than that to its northeast. That transport showed strong seasonality, with a maximum 8.8×104 m2/s in summer and minimum 7.5×104 m2/s in winter, which was mainly caused by local monsoon winds. A linear long-term upward trend of Kuroshio surface transport during 1993-2015 was found, during which the mean, southeast, and northeast of the Kuroshio east of Taiwan Island increased by 0.30×104, 0.22×104 and 0.36×104 m2/s, respectively. Correlation and composite analysis show that the Philippines-Taiwan Oscillation (PTO) is important in the interannual variability of the Kuroshio. PTO-induced relative intensity of anticyclonic and cyclonic eddies is the dominant influence on the interannual variability of the Kuroshio east of Taiwan Island.
Key words:    Kuroshio east of Taiwan Island|seasonal and interannual variation|Philippines-Taiwan Oscillation (PTO)|mesoscale eddy   
Received: 2016-12-01   Revised: 2017-01-17
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