  Deterministic and probabilistic tools from nonlinear dynamics are used to
assess enduring near-surface Lagrangian aspects of the Malvinas Current. The
deterministic tools are applied on a multi-year record of velocities derived
from satellite altimetry data, revealing a resilient cross-stream transport
barrier. This is composed of shearless-parabolic Lagrangian coherent structures
(LCS), which, extracted over sliding time windows along the multi-year
altimetry-derived velocity record, lie in near coincidental position. The
probabilistic tools are applied on a large collection of historical
satellite-tracked drifter trajectories, revealing weakly communicating flow
regions on either side of the altimetry-derived barrier. Shearless-parabolic
LCS are detected for the first time from altimetry data, and their significance
is supported on satellite-derived ocean color data, which reveal shapes that
quite closely resemble the peculiar V shapes, dubbed `chevrons,' that have
recently confirmed the presence of similar LCS in the atmosphere of Jupiter.
Finally, using in-situ velocity and hydrographic data, conditions for symmetric
stability are found to be satisfied, suggesting a duality between Lagrangian
and Eulerian stability for the Malvinas Current.
