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Vertical exchange in the ocean is an important conduit connecting the surface to the deep and influences the distributions of gases, nutrients, pollutants, and other tracers. Here the authors using high-resolution observations and numerical simulations of the ocean fronts in the Northern Gulf of Mexico reveal that the interaction between the fronts and land-sea breeze creates slantwise pathways for water parcels and induces significant subduction of surface water and upwelling of bottom water.