AI Article Synopsis
- The study measured anthropogenic radionuclides ((90)Sr, (137)Cs, and (239+240)Pu) in the Japan Sea/East Sea from 1997-2000, revealing different concentration profiles for each nuclide with depth.
- The area-averaged concentrations in the Japan Sea were found to be higher than those in the Northwest Pacific, indicating accumulation in the deep waters.
- High inventories of (137)Cs were particularly noted in the Japan Basin, attributed to wintertime convection that helps transport radionuclides into the Yamato Basin.
Article Abstract
The anthropogenic radionuclides, (90)Sr, (137)Cs and (239+240)Pu, were measured in the water column of the Japan Sea/East Sea during 1997-2000. The vertical profiles of radionuclide concentrations showed: exponential decrease with depth for (90)Sr and (137)Cs, and surface minimum/subsurface maximum for (239+240)Pu. These results do not differ substantially from results reported previously. The area-averaged concentrations of radionuclides in the Japan Sea are higher than those found in the Northwest Pacific Ocean below surface layer showing the accumulation of the radionuclides in the deep waters in the Japan Sea. Concerning spatial distributions, the area of high (137)Cs inventory extends from the Japan Basin into the Yamato Basin. It is suggested that wintertime convection of water, occurring mainly in the Japan Basin, causes the radionuclides to sink. The nuclides then advect into the Yamato Basin after detouring around the Yamato Rise.
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| http://dx.doi.org/10.1016/S0265-931X(03)00064-X | DOI Listing |
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