Emerging perspective: While the transport mechanisms depicted in the simplified view remain valid, this perspective from our study emphasizes the dynamic and intricate nature of non-linear matter transport along the TPD. It highlights the variability in surface water composition and complex iceocean interactions. In this view, distinct matter mixtures ( rm 1 , rm 2 ) associated with various Siberian river waters ( RW 1 , RW 2 ), and additional sources, such as Greenlandic meltwater constituents ( g ) from Greenland ( G ), actively shape the composition of both seawater and sea ice at different points ( l 1 , l x ) and times ( t 1 , t x ) along the drift, with a future decrease in the long-range l 1 t 1 pathway. The ice-driven redistribution of matter in the water column is indicated by white letters. Although both scenarios account for variable sea ice drift, straight arrows are used to provide a steady reference amidst surface layer fluctuations. In ( b ), this offset becomes more pronounced as liquid freshwater transport is more constrained by geostrophic forcing, leading to a stronger decoupling between ice-driven and ocean-driven matter transport (represented by a dashed line).
