Fig. 3

Flux of effectively dissolved Nd in the Changjiang estuary (unit: t yr⁻¹). Numbers represent Nd concentration fluxes. F_Q: river inputs; F_G: groundwater discharge; F_P: atmospheric wet deposition; F_{X YS}: exchange flow between the Yellow Sea and the Changjiang estuary; F_{X ECS}: exchange flow between the East China Sea and the Changjiang estuary; F_{R YS}: residual outflow to the Yellow Sea; F_{R ECS}: residual outflow to the East China Sea. Red-stripe area represents the salinity gradient