Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92..157b&link_type=abstract
Earth and Planetary Science Letters, Volume 92, Issue 2, p. 157-164.
Physics
12
Scientific paper
Concentrations of 234Th were measured in deep-sea bottom waters to assess the extent of chemical scavenging near the ocean floor. At five stations in the eastern tropical Pacific, where no appreciable bottom nepheloid layer (BNL) was observed, total 234Th was in secular equilibrium with its parent 238U, confirming earlier published results. In contrast, samples from a well-developed BNL in the western North Atlantic showed a significant depletion of 234Th due to its removal by scavenging. The largest depletions were observed in the two samples closest to the bottom (25 and 64 m above bottom) and amounted to 19% of the equilibrium value. The results can be used to test models that have been proposed to explain the existence of a BNL. It is concluded that only a model which includes local or nearby resuspension of sediment can account for the observations. From a steady-state model that assumes local resuspension, the average residence time of resuspended particles in the BNL is estimated to be 25 days.
Bacon Michael P.
Rutgers van der Loeff Michiel M.
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