Published May 11, 2023 | Version v1
Dataset Open

Lagrangian trajectory dataset for AMOC lower limb

  • 1. School of Ocean and Earth Science, University of Southampton, Southampton, UK
  • 2. Royal Netherlands Meteorological Institute, De Bilt, Netherlands
  • 3. National Oceanography Centre, Southampton, UK
  • 4. Department of Meteorology, Stockholm University, Stockholm, Sweden


These Lagrangian trajectory files were generated by TRACMASS, a Lagrangian parcel tracing algorithm, using data from a high-resolution (1/12o) ocean sea-ice hindcast. Two set of experiments were performed to trace the Atlantic Meridional Overturning Circulation (AMOC) lower limb; 1) Initiated only southward trajectories across the Fram Strait (fs) that corresponds to Arctic outflow and 2) traced only northward trajectories across the easten Subpolar North Atlantic (SPNA) Section which corresponds to Atlantic inflow and associated with the North Atlantic Current (nac).

_ini.csv = store positions and properties of trajectories at the starting location

_run.csv = store positions and properties of trajectories during the trajectory simulation

_out.csv = store positions and properties of trajectories at the ending location

_rerun.csv = This file is used to select trajectories that have reached a particular ending section. Column 2 in this file contain kill zone flag. Flag 1 means trajectories reaching the surface, 2 indicates trajectories reaching the Fram Strait , 3 means trajectories reaching the eastern SPNA section and finally 4 illustrate trajectories aprroaching the Barents Sea.

TRACMASS documentation is available at



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Additional details


Consequences of Arctic Warming for European Climate and Extreme Weather NE/V005855/1
UK Research and Innovation