A spectral mixture model analysis of the Kuroshio variability and the water exchange between the Kuroshio and the East China Sea

作者：Song Jun; Xue Huijie; Bao Xianwen^*; Wu Dexing; Chai Fei; Shi Lei; Yao Zhigang; Wang Yongzhi; Nan Feng; Wan Kai

来源：Chinese Journal of Oceanology and Limnology, 2011, 29(2): 446-459.

DOI：10.1007/s00343-011-0114-7

• East China Sea (ECS)
• Kuroshio
• spectral clustering
• spectral mixture model
• water mass analysis
• water exchange

For understanding more about the water exchange between the Kuroshio and the East China Sea, We studied the variability of the Kuroshio in the East China Sea (ECS) in the period of 1991 to 2008 using a three-dimensional circulation model, and calculated Kuroshio onshore volume transport in the ECS at the minimum of 0.48 Sy (1 Sy = 10(6) m(3)/s) in summer and the maximum of 1.69 Sy in winter. Based on the data of WOA05 and NCEP, The modeled result indicates that the Kuroshio transport east of Taiwan Island decreased since 2000. Lateral movements tended to be stronger at two ends of the Kuroshio in the ECS than that of the middle segment. In addition, we applied a spectral mixture model (SMM) to determine the exchange zone between the Kuroshio and the shelf water of the ECS. The result reveals a significantly negative correlation (coefficient of -0.78) between the area of exchange zone and the Kuroshio onshore transport at 200 m isobath in the ECS. This conclusion brings a new view for the water exchange between the Kuroshio and the East China Sea. Additional to annual and semi-annual signals. intra-seasonal signal of probably the Pacific origin may trigger the events of Kuroshio intrusion and exchange in the ECS.

• 出版日期2011-3
• 单位国家海洋局第一海洋研究所; 中国海洋大学; 国家海洋信息中心