210Po and 210Pb distributions in ocean water profiles from the Eastern South Pacific |
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| Authors: | John Thomson Karl K Turekian |
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| Institution: | Department of Geology and Geophysics, Yale University, New Haven, Conn. 06520, USA |
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| Abstract: | Two ocean profiles from the Peru Basin from regions with different surface productivities were analyzed for total210Pb and201Po to evaluate the influence of particulates in the water column on their distribution. Comparison with a published226Ra profile for the region was made. The profile closest to the coast, where upwelling and productivity are high, shows depletion of210Pb relative to226Ra at all depths, with particularly marked excursions from radioactive equilibrium at the surface and in the bottom water.210Po appears to be deficient relative to210Pb at depth as well. Mean residence times in the deep water, relative to particulate removal from the water column to the sediments, of about 100 years for210Pb and about two years for210Po are indicated. The profile northwest of the upwelling region shows the226Ra 210Pb210Po system close to equilibrium at all depths to 1500 m (except for the effect of atmospheric210Pb input seen at the surface. |
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