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Transect along 24oN Latitude of 14C in Dissolved Inorganic Carbon in the Subtropical North Atlantic Ocean
Abstract
The distribution of bomb-produced 14C in the ocean provides a powerful constraint for circulation models of
upper ocean mixing. We report 14C measurements from an east-west section of the main thermocline at 24oN latitude in the subtropical North Atlantic Ocean in summer 1992, and one profile from the Gulf of Mexico in 1993. Observed gradients reflect the transient invasion of bomb 14C into the thermocline via mixing along isopycnals from the poleward outcrop, with
progressively more sluggish mixing at greater depths. A slight deepening of the profile is observed over the 20-yr period since the GEOSECS survey at one location where the comparison is possible.
upper ocean mixing. We report 14C measurements from an east-west section of the main thermocline at 24oN latitude in the subtropical North Atlantic Ocean in summer 1992, and one profile from the Gulf of Mexico in 1993. Observed gradients reflect the transient invasion of bomb 14C into the thermocline via mixing along isopycnals from the poleward outcrop, with
progressively more sluggish mixing at greater depths. A slight deepening of the profile is observed over the 20-yr period since the GEOSECS survey at one location where the comparison is possible.