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| Titel |
The impact of oceanic circulation and phase transfer on the dispersion of radionuclides released from the Fukushima Dai-ichi Nuclear Power Plant |
| VerfasserIn |
Y. Choi, S. Kida, K. Takahashi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-22), S.4911-4925 |
| Datensatznummer |
250018352
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| Publikation (Nr.) |
 copernicus.org/bg-10-4911-2013.pdf |
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| Zusammenfassung |
| The mechanism behind the dispersion of radionuclides released from the
Fukushima Dai-ichi Nuclear Power Plant on March 2011 is investigated using a
numerical model. This model is a Lagrangian particle tracking–ocean
circulation coupled model that is capable of solving the movement and
migration of radionuclides between seawater, particulates, and bottom
sediments. Model simulations show the radionuclides dispersing rapidly into
the interior of the North Pacific once they enter a meso-scale eddy.
However, some radionuclides also remain near the coast, with spatial
distribution depending strongly on the oceanic circulation during the first
month after the release. Major adsorption to bottom sediments occurs during
this first month and many of these radionuclides remain on the sea floor
once they are adsorbed. Model results suggest that weak offshore advection
during the first month will increase the adsorption of radionuclides to
bottom sediments and decelerate the dispersion to the open ocean. If
vertical mixing is weak, however, fewer radionuclides reach the sea floor and
adsorb to bottom sediments. More radionuclides will then quickly disperse to
the open ocean. |
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