Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..377m&link_type=abstract
Earth and Planetary Science Letters, Volume 62, Issue 3, p. 377-384.
Physics
8
Scientific paper
A 230Th profile (dissolved + particulate) measured in the eastern central Atlantic at 24°45'N, 26°57'W displays a linear increase with depth. Values range between 0.2 dpm 230Th/104 l at the surface and 2.0 dpm 230Th/104 l at 4000 m. This concentration is 5 times lower than total 230Th in the central Pacific and is similar to 230Th measured on suspended matter in the Pacific and Indian Ocean. The lower concentration in the eastern Atlantic must either reflect a higher scavenging activity at the West African margin or be a consequence of a higher particle flux through the water column, yielding an average settling velocity of particulate matter of 6.2 × 10-3 cm/s.
Despite the lower concentration, the equilibrium coefficient between dissolved and adsorbed 230Th is similar to the one derived for the central Pacific. This shows that the equilibrium model for 230Th scavenging from the water column derived by Nozaki et al. [1] and Bacon and Anderson [2] applies as well in the eastern Atlantic.
Key Robert M.
Mangini Augusto
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