Other
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62....7a&link_type=abstract
Earth and Planetary Science Letters, Volume 62, Issue 1, p. 7-23.
Other
66
Scientific paper
Concentrations of 230Th and 231Pa were measured in particulate matter collected by sediment traps deployed in the Sargasso Sea (Site S2), the north equatorial Atlantic (site E), and the north equatorial Pacific (Site P) as well as in particles collected by in situ filtration at Site E. Concentrations of dissolved Th and Pa were determined by extraction onto manganese dioxide adsorbers at Site P and at a second site in the Sargasso Sea (site D).
Dissolved 230Th/231Pa activity ratios were 3-6 at Sites P and D. In contrast, for all sediment trap samples from greater than 2000 m, unsupported 230Th/231Pa ratios were 22-35 (average 29.7). Ratios were lower in particulate matter sampled at shallower depths. Particles filtered at 3600 m and 5000 m at Site E had ratios of 50 and 40. Results show that suspended particulate matter in the open ocean preferentially scavenges Th relative to Pa. Most of the 230Th produced by decay of 234U in the open ocean is removed by adsorption to settling particulate matter. In contrast, less than 50% of the 231Pa produced by decay of 235U is removed from the water column by this mechanism. Mixing processes transport the remainder to other sinks.
Anderson Robert F.
Bacon Michael P.
Brewer Peter G.
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