World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

137Cs Off Fukushima Dai-ichi, Japan – Model Based Estimates of Dilution and Fate : Volume 8, Issue 3 (05/06/2012)

By Dietze, H.

Click here to view

Book Id: WPLBN0004020578
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: 137Cs Off Fukushima Dai-ichi, Japan – Model Based Estimates of Dilution and Fate : Volume 8, Issue 3 (05/06/2012)  
Author: Dietze, H.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Kriest, I., & Dietze, H. (2012). 137Cs Off Fukushima Dai-ichi, Japan – Model Based Estimates of Dilution and Fate : Volume 8, Issue 3 (05/06/2012). Retrieved from http://worldebooklibrary.net/


Description
Description: IFM-GEOMAR, Leibniz Institute of Marine Sciences, Düsternbrooker Weg 20, 24105 Kiel, Germany. In the aftermath of an earthquake and tsunami on 11 March 2011 radioactive 137Cs was discharged from a damaged nuclear power plant to the sea off Fukushima Dai-ichi, Japan. Here we explore its dilution and fate with a state-of-the-art global ocean general circulation model, which is eddy-resolving in the region of interest. We find apparent consistency between our simulated circulation, estimates of 137Cs discharged ranging from 0.94 p Bq (Japanese Government, 2011) to 3.5 ± 0.7 p Bq (Tsumune et al., 2012), and measurements by Japanese authorities and the power plant operator. In contrast, our simulations are apparently inconsistent with the high 27 ± 15 p Bq discharge estimate of Bailly du Bois et al. (2012).

Expressed in terms of a diffusivity we diagnose, from our simulations, an initial dilution on the shelf of 60 to 100 m2 s−1. The cross-shelf diffusivity is at 500 ± 300 m2 s−1 significantly higher and variable in time as indicated by its uncertainty. Expressed as an effective residence time of surface water on the shelf, the latter estimate transfers to 43 ± 16 days.

As regards the fate of 137Cs, our simulations suggest that activities up to 4 mBq l−1 prevail in the Kuroshio-Oyashio Interfrontal Zone one year after the accident. This allows for low but detectable 0.1 to 0.3 m Bq l−1 entering the North Pacific Intermediate Water before the 137Cs signal is flushed away. The latter estimates concern the direct release to the sea only.


Summary
137Cs off Fukushima Dai-ichi, Japan – model based estimates of dilution and fate

Excerpt
Antonov, J. I., Locarnini, R. A., Boyer, T. P., Mishonov, A. V., Garcia, H. E., and Levitus, S.: World Ocean Atlas 2005, Volume 2: Salinity. NOAA Atlas NESDIS 62, U.S. Government Printing Office, Washington, DC, 182 pp., 2006.; Bailly du Bois, P., Laguionie, P., Boust, D., Korsakissok, I., Didier, D., and Fiévet, B.: Estimation of marine source-term following Fukushima Dai-ichi accident, Journal of Environmental Radioactivity, doi:10.1016/j.jenvrad.2011.11.015, in press, 2012.; Buesseler, K. O., Aoyama, M., and Fukasawa, M.: Impacts of the Fukushima Nuclear Power Plants on marine radioactivity, Environ. Sci. Technol., 45, 9931–9935, doi:10.1021/es202816c, 2011.; Buesseler, K. O., Jayne, S. R., Fisher, N. S., Rypina, I. I., Baumann, H., Baumann, Z., Breier, C. F., Douglass, E. M., George, J., Macdonald, A. M., Miyamoto, H., Nishikawa, J., Pike, S. M., and Yoshida, S: Fukushima-derived radionuclides in the ocean and biota off Japan, P. Natl. Acad. Sci. USA, 109, 5984–5988, doi:10.1073/pnas.1120794109, 2012.; Capet, X., Campos, E. J., and Pavia, A. M.: Submesoscale activity over the Argentinian shelf, Geophys. Res. Lett., 35, 1–5, doi:10.1029/2008GL034736, 2008.; Dietze, H. and Kriest, I.: Tracer distribution in the Pacific Ocean following a release off Japan – what does an oceanic general circulation model tell us?, Ocean Sci. Discuss., 8, 1441–1466, doi:10.5194/osd-8-1441-2011, 2011.; Dietze, H., Matear, R. J., and Moore, T. J.: Nutrient supply to anticyclonic meso-scale eddies off western Australia estimated with artificial tracers released in a circulation model, Deep-Sea Res. I, 56, 1440–1448, doi:10.1016/j.dsr.2009.04.012, 2009.; Ducet, N. and LeTraon, P. Y.: A comparison of surface eddy kinetic energy and Reynolds stresses in the Gulf Stream and the Kuroshio Current systems from merged TOPEX/Poseidon and ERS-1/2 altimetric data, J. Geophys. Res., 106, 16603–16622, 2001.; Fratantoni, D. M.: North Atlantic surface circulation during the 1990's observed with satellite-tracked drifters, J. Geophys. Res., 106, 22067–22093, 2001.; Griffies, S. M., Gnanadesikan, A., Dixon, K. W., Dunne, J. P., Gerdes, R., Harrison, M. J., Rosati, A., Russell, J. L., Samuels, B. L., Spelman, M. J., Winton, M., and Zhang, R.: Formulation of an ocean model for global climate simulations, Ocean Sci., 1, 45–79, doi:10.5194/os-1-45-2005, 2005.; Griffies, S. M. and Hallberg, R. W.: Biharmonic friction with a Smagorinsky-like viscosity for use in large-scale eddy-permitting ocean models, Mon. Weather Rev., 128, 2935–2946, 2000.; Houghton, R. W., Hebert, D., and Prater, M.: Circulation and mixing at the New England shelfbreak front: Results of purposeful tracer experiments, Prog. Oceanogr., 70, 289–312, doi:10.1016/j.pocean.2006.05.001, 2006.; Institut de Radioprotection et de sûreté nucléaire: Impact on the marine environment of radioactive releases following the nuclear accident at Fukushima Dai-ichi 13th of May 2011, 2011.; Japanese Government, Report of Japanese Government to the IAEA ministerial conference on nuclear safety: The accident at TEPCO's Fukushima nuclear power stations, Nuclear Emergence Response Headquaters, Government of Japan, 2011.; Ledwell, J. R., Watson, A. J., and Law, C. S.: Mixing of a tracer in the pycnocline, J. Geophys. R

 

Click To View

Additional Books


  • High Frequency Variability of the Atlant... (by )
  • An Optical Model for Deriving the Spectr... (by )
  • Technical Note: a Low Cost Unmanned Aeri... (by )
  • An Alternative Method for Correcting Flu... (by )
  • On the Representation of Regional Charac... (by )
  • Spatio-temporal Complexity Analysis of t... (by )
  • Mean Circulation in the Coastal Ocean Of... (by )
  • Deep Drivers of Mesoscale Circulation in... (by )
  • Ocean State Indicators from Myocean Alti... (by )
  • Black Sea Coastal Forecasting System : V... (by )
  • Dynamics of Turbulent Western Boundary C... (by )
  • Coupling of Eastern and Western Subpolar... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.