Particulate removal of 230Th and 231Pa in the biologically productive northern North Pacific

Details Particulate removal of 230Th and 231Pa in the biologically productive northern North Pacific Particulate removal of 230Th and 231Pa in the biologically productive northern North Pacific

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..223t&link_type=abstract

Earth and Planetary Science Letters, Volume 93, Issue 2, p. 223-232.

Mathematics

Logic

21

Scientific paper

Settling particles were collected by sediment traps at four stations in the high latitudes of the North Pacific and analyzed for 234Th, 232Th, 230Th, 228Th and 231Pa. In the northern North Pacific, including the Bering Sea, the average activity ratio of unsupported 230Th to 231Pa in settling particles was 5.5, whereas that in the Gulf of Alaska in the eastern North Pacific was about 14. The northern North Pacific may be an efficient sink for 231Pa relative to 230Th because the average ratio in the world ocean is equal to the production ratio of 10.8 in seawater. The activity ratios of 230Th/231Pa of the settling particles agree well with those of the surface sediments at the respective stations. This indicates that both nuclides in the surface sediments originated from settling particles and their dissolution or uptake during early diagenesis are not effective.
The ratio of the particulate nuclide flux (F) to the overlying water column production rate (P) did not correlate well with the total mass flux for 230Th. However, that for 231Pa increased almost linearly with increase in total mass flux and reached unity when the total mass flux was about 110 mg/m2 d. This suggests that 231Pa transported from oligotrophic regions is being actively removed in the biologically productive northern North Pacific.

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