Computer Science
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..297t&link_type=abstract
Earth and Planetary Science Letters, Volume 32, Issue 2, p. 297-303.
Computer Science
11
Scientific paper
Two ocean profiles from the Peru Basin from regions with different surface productivities were analyzed for total 210Pb and 201Po to evaluate the influence of particulates in the water column on their distribution. Comparison with a published 226Ra profile for the region was made. The profile closest to the coast, where upwelling and productivity are high, shows depletion of 210Pb relative to 226Ra at all depths, with particularly marked excursions from radioactive equilibrium at the surface and in the bottom water. 210Po appears to be deficient relative to 210Pb 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 for 210Pb and about two years for 210Po are indicated. The profile northwest of the upwelling region shows the 226Ra-210Pb-210Po system close to equilibrium at all depths to 1500 m (except for the effect of atmospheric 210Pb input seen at the surface.
Thomson J. J.
Turekian Karl K.
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