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PacificSea #Radioactive ContaminationFrom #Fukushima in10Ys太平洋 #放射能 汚染10年間予想

1y ago


太平洋放射能汚染10年間予想 The data of the modeling of Distribution of the radioactive contamination in the Pacific Ocean from Fukushima by the GEOMAR | Helmholtz-Zentrum für Ozeanforschung Kiel up to 10 years after disaster. 07/06/2012 Fukushima - Where is the radioactive water? (Ger.⇒English Translation by Google Soft) Provide strong eddy mixing in the Pacific 09.07.2012/Kiel. The nuclear disaster in Fukushima Japan already gets back into oblivion. Wide large amounts of radioactive substances released in the process, however, yet to be established in the Pacific. Scientists at the GEOMAR | Helmholtz Centre for Ocean Research Kiel have examined the long-term extension with the help of a model study. After the strong mixing of oceanic eddy provides for a rapid dilution of the radioactive water. When the first runners to reach in about three years ago, the North American coast, the radioactivity should already lie below the values ​​that are still to be found as a result of the Chernobyl disaster in the Baltic Sea. By the nuclear catastrophe at Fukushima in March last year, large quantities of radioactive material were released. A major part of it came through the atmosphere, but partly also by direct discharge into the Pacific Ocean, including long-lived isotopes, such as the highly soluble in seawater cesium-137. Using detailed computer simulations, researchers at the GEOMAR | Helmholtz Centre for Ocean Research Kiel investigates the long-term expansion. "In our models, we have placed great emphasis on a realistic representation of finer details of the flows," said team leader, Prof. Claus Böning, "because the material spread not only through the main current, the Kuroshio, but mainly by intense and highly variable eddy dominated. " "May have been through this strong turbulence, the radioactive water spreads already has nearly half the North Pacific According to our model calculations," said graduate oceanographer Erik Behrens, lead author of the international scientific journal "Environmental Research Letters" published study. "In addition, winter storms have mixed the water to depths of 500 meters." The attendant dilution in the model bill provides for a rapid decrease of cesium concentration. The effect of the wide ocean mixing is particularly evident when comparing the model simulated the time course of radiation levels in the Pacific with the situation in the Baltic Sea. "That was in March and April 2011 in the Pacific flowed amount of radioactivity at least three times as large as the one registered in 1986 as a result of the Chernobyl disaster in the Baltic Sea," said Boening. "Nevertheless, we simulated the radiation levels in the Pacific are already lower than the values ​​that we have today, 26 years after Chernobyl, in the Baltic Sea will."