It has been debated for a long period that where the Subei low-salinity water (SLW) is originated from. Subei literally means the northern Jiangsu province in Chinese. Subei coastal water is at the upshelf of Changjiang Estuary in the sense of Kelvin wave.The Coriolis forcing, plus the prevailing northerly monsoon that is to the downshelf direction, are unfavorable for the Changjiang diluted water to reach there. Wu et al. (2014, CSR) suggested that the tidal residual current could drive a small portion of Changjiang plume to Subei coastal water, and named it as the third pathway of Changjiang River plume. However, there are researchers believe that the local rivers in Subei area is more important. Here in this study, we conducted numerical simulations to examine the contribution of different sources to the SLW, by releasing passive tr acers and calculating water ages. We also analyzed the depth-integrated momentum balance to check the dynamics responsible for the migration of freshwaters originated from different sources.
