A Lagrangian framework for diagnosing tidally induced transport pathways: Helgoland trapping system as a test case

Offline Lagrangian particle-tracking output for the southeastern North Sea, computed from depth-averaged FESOM-C v.2 velocities on a hybrid mesh with ~30 m resolution around Helgoland. Two experiment types are archived: 228 realizations of the one-tidal-cycle displacement field across the domain, together with the corresponding median displacement field and S-values (Type A, tide-only and tide-plus-baroclinic), and 59-day trajectories of 702 particles released around Helgoland under eight forcing configurations (Type B). The record also contains the particle-tracking source code and MATLAB analysis scripts used to reproduce the diagnostics and figures of the accompanying manuscript.