  The Mediterranean Sea releases approximately 1Sv of water into the North
Atlantic through the Gibraltar Straits, forming the saline Mediterranean
Outflow Water (MOW). Its impact on large-scale flow and specifically its
northbound Lagrangian pathways are widely debated, yet a comprehensive overview
of MOW pathways over recent decades is lacking. We calculate and analyze
synthetic Lagrangian trajectories in 1980-2020 reanalysis velocity data. 16\%
of the MOW follow a direct northbound path to the sub-polar gyre, reaching a
1000m depth crossing window at the southern tip of Rockall Ridge in about 10
years. Surprisingly, time-dependent chaotic advection, not steady currents,
drives over half of the northbound transport. Our results suggest a potential
15-20yr predictability in the direct northbound transport, which points to an
upcoming decrease of MOW northbound transport in the next couple of decades.
Additionally, monthly variability appears more significant than inter-annual
variability in mixing and spreading the MOW.
