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Global Distributions of {sup 137}Cs, {sup 239,240}Pu and the Ratio of {sup 239,240}Pu/{sup 137}Cs in an Ocean General Circulation Model

Abstract

The spatial distributions and the temporal variations of {sup 137}Cs and {sup 239,240}Pu concentrations were simulated by using an ocean general circulation model (OGCM). These radionuclides are introduced into the ocean by global fallout originating from atmospheric nuclear weapons tests. {sup 137}Cs derived from global fallout is transported into the ocean interior by advection and diffusion, and the {sup 137}Cs concentration is reduced by radioactive decay. In contrast to {sup 137}Cs, {sup 239,240}Pu, which is a particle reactive radionuclide, is a biogeochemical tracer. The global distribution of the {sup 239,240}Pu{sup /137}Cs ratio was investigated in an OGCM with a biogeochemical process model. A half regeneration depth (HRD) of {sup 239,240}Pu was estimated from curve fitting of the vertical profile of the {sup 239,240}Pu/{sup 137}Cs ratio. Simulated distribution of the HRD is in good agreement with observation, except in the subarctic gyre. The HRD is a good tool to improve the parameters in the biogeochemical process. (author)
Authors:
Tsumune, D.; Tsubono, T.; Misumi, K.; Yoshida, Y.; [1]  Aoyama, M.; [2]  Hirose, K. [3] 
  1. Environmental Research Laboratory, Central Research Institute of Electric Power Industry, Abiko (Japan)
  2. Geochemical Research Department, Meteorological Research Institute, Tsukuba (Japan)
  3. Sophia University, Tokyo (Japan)
Publication Date:
Jul 15, 2013
Product Type:
Conference
Report Number:
IAEA-CN-186/136
Resource Relation:
Conference: International Symposium on Isotopes in Hydrology, Marine Ecosystems and Climate Change Studies, Monaco (Monaco), 27 Mar - 1 Apr 2011; Other Information: 4 figs., 14 refs.; Related Information: In: Isotopes in Hydrology, Marine Ecosystems and Climate Change Studies, Vol. 2. Proceedings of the International Symposium| 655 p.
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; CESIUM 137; DIFFUSION; ECOLOGICAL CONCENTRATION; GENERAL CIRCULATION MODELS; GLOBAL FALLOUT; NUCLEAR DECAY; NUCLEAR EXPLOSIONS; PLUTONIUM 240; REGENERATION; SEAS; SIMULATION; SPATIAL DISTRIBUTION
OSTI ID:
22123124
Research Organizations:
International Atomic Energy Agency, Department of Nuclear Sciences and Applications, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; ISBN 978-92-0-135610-9; TRN: XA13R0931078926
Availability:
Also available on-line: http://www-pub.iaea.org/MTCD/Publications/PDF/SupplementaryMaterials/Pub1580_vol2_web.pdf; Enquiries should be addressed to IAEA, Marketing and Sales Unit, Publishing Section, E-mail: sales.publications@iaea.org; Web site: http://www.iaea.org/books
Submitting Site:
INIS
Size:
page(s) 493-499
Announcement Date:
Aug 30, 2013

Citation Formats

Tsumune, D., Tsubono, T., Misumi, K., Yoshida, Y., Aoyama, M., and Hirose, K. Global Distributions of {sup 137}Cs, {sup 239,240}Pu and the Ratio of {sup 239,240}Pu/{sup 137}Cs in an Ocean General Circulation Model. IAEA: N. p., 2013. Web.
Tsumune, D., Tsubono, T., Misumi, K., Yoshida, Y., Aoyama, M., & Hirose, K. Global Distributions of {sup 137}Cs, {sup 239,240}Pu and the Ratio of {sup 239,240}Pu/{sup 137}Cs in an Ocean General Circulation Model. IAEA.
Tsumune, D., Tsubono, T., Misumi, K., Yoshida, Y., Aoyama, M., and Hirose, K. 2013. "Global Distributions of {sup 137}Cs, {sup 239,240}Pu and the Ratio of {sup 239,240}Pu/{sup 137}Cs in an Ocean General Circulation Model." IAEA.
@misc{etde_22123124,
title = {Global Distributions of {sup 137}Cs, {sup 239,240}Pu and the Ratio of {sup 239,240}Pu/{sup 137}Cs in an Ocean General Circulation Model}
author = {Tsumune, D., Tsubono, T., Misumi, K., Yoshida, Y., Aoyama, M., and Hirose, K.}
abstractNote = {The spatial distributions and the temporal variations of {sup 137}Cs and {sup 239,240}Pu concentrations were simulated by using an ocean general circulation model (OGCM). These radionuclides are introduced into the ocean by global fallout originating from atmospheric nuclear weapons tests. {sup 137}Cs derived from global fallout is transported into the ocean interior by advection and diffusion, and the {sup 137}Cs concentration is reduced by radioactive decay. In contrast to {sup 137}Cs, {sup 239,240}Pu, which is a particle reactive radionuclide, is a biogeochemical tracer. The global distribution of the {sup 239,240}Pu{sup /137}Cs ratio was investigated in an OGCM with a biogeochemical process model. A half regeneration depth (HRD) of {sup 239,240}Pu was estimated from curve fitting of the vertical profile of the {sup 239,240}Pu/{sup 137}Cs ratio. Simulated distribution of the HRD is in good agreement with observation, except in the subarctic gyre. The HRD is a good tool to improve the parameters in the biogeochemical process. (author)}
place = {IAEA}
year = {2013}
month = {Jul}
}