Numerical studies of upwelling in coastalareas of the East China Sea——Ⅰ The tide-induced upwelling

The M₂ constituent in the coastal areas of the East China Sea is computed based on three-dimensional nonlinear tidal wave equations.The distributions of the tide-induced horizontal residual currents and the tide-induced vertical residual currents indicate that there exists a coastal upwelling stripe off Fujian and Zhejiang with a width of 40 km or so.The computed largest upwelling, 0.5×10^-3 cm/s, occurs between 10 and 20 m levels.