= Solution
Dense water formed in marginal seas spills over sills and descends the continental slope as a <marginal-sea overflow>. Strong <shear flow> generates <turbulent mixing> and <entrainment> of surrounding, lighter water. The descending current's <volume flux> grows while its <density> anomaly is diluted, modifying the depth at which it joins the deep circulation and the <temperature> and <salinity> of the exported water. Thus the deep <volume flux> can substantially exceed the source overflow <volume flux>; it cannot be inferred from northern surface cooling alone.https://www2.whoi.edu/staff/lpratt/wp-content/uploads/sites/120/2019/07/PrattSec2.11_11823.pdf[Anatomy of an overflow, section 2.11: observed downstream entrainment and dilution of the Faroe Bank Channel overflow]{ref}
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