Lagrangian predictability assessed in the East China Sea

► 3 metrics show Lagrangian predictive timescale is much shorter than the Eulerian one. ► Salient flow features have a large impact on Lagrangian predictability. ► Coarsening velocities in space/time has little impact on Lagrangian predictability. ► Lagrangian decorrelation time scale is a poor indicator of Lagrangian predictability.