An Estimation Of Water Exchange Between The East China Sea And Kuroshio

We use a high-resolution Numerical Model ROMS (Regional Ocean Modeling System) to simulate The Current System in The East China Sea. The results of numerical simulation are consistent with the understanding of the Kuroshio in recent years. The East China Sea circulation is mainly composed of the East China Sea coastal current, Taiwan Warm Current, Tsushima Warm Current and Kuroshio, and the East China Sea circulation has obvious seasonal variation.The Kuroshio onshore fluxes have two major sources, Kuroshio intrusion northeast of Taiwan and Kuroshio separation southwest of Kyushu; The onshore invasion of the kuroshio through the surface lower in northeastern Taiwan is heavily influenced by the growth and decline of the Taiwan warm current. The Kuroshio separation southwest of Kyushu is strong in winter and weak in summer.The Taiwan Strait and Channel between Taiwan and Iriomote are the main channels of water flowing into the East China Sea, Tsushima strait, Tokara strait, Osumi strait and Channels between the Ryukyu islands are the main channels of water flowing out. Results show that Kuroshio flow larger during spring and summer with annual flux of 24.16Sv. Kuroshio net onshore flux across the 200m isobath is evaluated as 0.99Sv. Kuroshio onshore flux have two major sources, Kurosho intrusion northeast of Taiwan and Kuroshio separation southwest of Kyushu, the former provides a annually averaged onshore flux of 1.907Sv and the later provides a annually averaged onshore flux of 0.065 Sv. The annually averaged onshore flux at Midway of Kuroshio is estimated to be 0.982Sv.