The water column distributions of thorium isotopes in the western North Pacific

Details The water column distributions of thorium isotopes in the western North Pacific The water column distributions of thorium isotopes in the western North Pacific

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..54..203n&link_type=abstract

Earth and Planetary Science Letters, Volume 54, Issue 2, p. 203-216.

Physics

63

Scientific paper

Four vertical profiles of 230Th and 228Th were determined using large volume water samples in the western North Pacific. An almost linear increase of 230Th with depth was observed for all of the profiles for which the unidirectional first order scavenging model was difficult to explain. We developed a model which included a dissolved-particulate transformation as well as parameters of the scavenging model. Application of the model to the vertical distributions of total and the GEOSECS particulate Th isotopes (230Th and 234Th) yielded the residence time of dissolved Th with respect to adsorption to particles and the turnover time of particulate Th to be 235 days and 57 days, respectively. The Th isotopes appeared to be carried down the water column by fine particles with a mean settling velocity of 1 m/day which continually release Th into sea water as well as pick up Th from the water along their journey to the bottom.
For 228Th, a large excess over 232Th was observed throughout the water column with pronounced high concentrations in surface and bottom waters, suggesting that the 228Th was derived from 228Ra diffused out of sediments. The vertical distributions of 228Th seemed to be significantly influenced by lateral mixing along isopycnals.

Affiliated with

Also associated with

No associations

Rating

The water column distributions of thorium isotopes in the western North Pacific does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The water column distributions of thorium isotopes in the western North Pacific, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The water column distributions of thorium isotopes in the western North Pacific will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1688103