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| Titel |
Cesium-134 and 137 activities in the central North Pacific Ocean after the Fukushima Dai-ichi Nuclear Power Plant accident |
| VerfasserIn |
J. Kameník, H. Dulaiova, K. O. Buesseler, S. M. Pike, K. Št'astná |
| 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. 9 ; Nr. 10, no. 9 (2013-09-23), S.6045-6052 |
| Datensatznummer |
250085334
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| Publikation (Nr.) |
 copernicus.org/bg-10-6045-2013.pdf |
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| Zusammenfassung |
| Surface seawater 134Cs and 137Cs samples were
collected in the central and western North Pacific Ocean during the
2 yr after the Fukushima Dai-ichi Nuclear Power Plant
accident to monitor dispersion patterns of these radioisotopes towards
the Hawaiian Islands. In the absence of other recent sources and due
to its short half-life, only those parts of the Pacific Ocean would
have detectable 134Cs values that were impacted by Fukushima
releases. Between March and May 2011, 134Cs was not detected
around the Hawaiian Islands and Guam. Here, most 137Cs
activities (1.2–1.5 Bq m–3) were in the range of expected
preexisting levels. Some samples north of the Hawaiian Islands
(1.6–1.8 Bq m–3) were elevated above the 23-month
baseline established in surface seawater in Hawaii indicating that
those might carry atmospheric fallout. The 23-month time-series
analysis of surface seawater from Hawaii did not reveal any seasonal
variability or trends, with an average activity of
1.46 ± 0.06 Bq m–3 (Station Aloha, 18 values). In
contrast, samples collected between Japan and Hawaii contained
134Cs activities in the range of 1–4 Bq m–3, and
137Cs levels were about 2–3 times above the preexisting
activities. We found that the southern boundary of the Kuroshio and
Kuroshio extension currents represented a boundary for radiation
dispersion with higher activities detected within and north of the
major currents. The radiation plume has not been detected over the
past 2 yr at the main Hawaiian Islands due to the transport
patterns across the Kuroshio and Kuroshio extension currents. |
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