Assertion: bomb tritium | /r/HasProperty | restricted to upper 1 km
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text: Otherwise, bomb tritium is restricted to the upper 1 km, tracing the bowl-like structure of the main thermocline, which it penetrates by subduction of fluid by a combination of wind stress convergence (a process called ‘Ekman pumping’, i.e. convergence of surface waters due to wind forcing effectively pushes water downward) and southward penetration under lighter, warmer waters.