Anomalous large scavenging of Th-230 and Pa-231 controlled by particle composition in the northwestern North Pacific SCIE SCOPUS

Cited 14 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
Anomalous large scavenging of Th-230 and Pa-231 controlled by particle composition in the northwestern North Pacific
Author(s)
Narita, H; Abe, R; Tate, K; Kim, YI; Harada, K; Tsunogai, S
KIOST Author(s)
KIM, YOUNG-IL(김영일)
Publication Year
2003-10
Abstract
We report the role of particle composition and lateral particle movement that influences the oceanic distribution of Pa-231 and Th-230. Settling particles were collected during sediment trap experiments. These and surface sediments were obtained from five stations along 38 to 44degreesN in the northwestern North Pacific. The high total mass flux and seasonal variations in the marginal area of the western North Pacific are controlled by the supply of lithogenic materials and primary productivity. The high content of the lithogenic material in the settling particles in this area contributes to Th-230(ex) fluxes that exceed the local rate of supply. The lithogenic materials are important as a carrier of Th-230 and contribute to the fractionation between Th-230 and Pa-231 in the ocean, as the Pa-231(ex)/Th-230(ex) ratio in the settling particles decreases with increasing Th-232 concentration. The Pa-231(ex)/Th-230(ex) ratio in the settling particles collected in the abyssal basin decreases with water depth, which indicates that lateral transport of the lithogenic particles from the marginal area and/or shallower depth plays an important role in determining the Pa-231(ex)/Th-230(ex) ratio in a population of settling particles and remineralization. This indicates that lateral redistribution of particles and sediment focusing influence the Pa-231(ex)/Th-230(ex) ratios in surface sediments. Thus, the observations reported here mean that the use of the sediment Pa-231(ex)/Th-230(ex) ratio as a paleoproductivity proxy will be problematic in the northwestern North Pacific.
ISSN
0916-8370
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5442
DOI
10.1023/B:JOCE.0000009602.16947.74
Bibliographic Citation
JOURNAL OF OCEANOGRAPHY, v.59, no.5, pp.739 - 750, 2003
Publisher
TERRA SCIENTIFIC PUBL CO
Keywords
boundary scavenging; radionuclides; sediment trap experiments; northwestern North Pacific
Type
Article
Language
English
Document Type
Article; Proceedings Paper
Publisher
TERRA SCIENTIFIC PUBL CO
Related Researcher
Research Interests

Distribution and Behavior of Radionuclides in the Ocean,Total Massflux of Singking Particle in East Sea,Material Transport Process in the Ocean

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