The downstream evolution of tritium (upper panel, in tritium units) and tritium-helium age (lower panel, in years) vs. distance in the core of the deep western boundary current. Note the approximately tenfold reduction in tritium content in the Deep Western Boundary Current core due to dilution with older, surrounding deep water, and the linear increase in age downstream. The age increase is consistent with a mean speed of about 1.5 centimeters per second[back]
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