Journal of the korean society of oceanography

The Korean Society of Oceanography (한국해양학회)
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Estimation of Sedimentation and Particle Mixing Rates in Ulleung Basin of the East Sea (Sea of Japan) Using $^7Be,{\;}^{234}Th,{\;}^{210}Pb,{\;}and{\;}^{137}Cs$

  • Kim, Kee-Hyun (Department of Oceanography and Ocean Environmental Sciences, Chungnam National University) ;
  • Park, Nam-Joon (Department of Oceanography and Ocean Environmental Sciences, Chungnam National University)
  • Published : 2003.12.01
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Abstract

In order to understand the characteristics of sedimentary environments in Ulleung Basin of the East Sea (Sea of Japan), three sediment cores were taken with a box corer during R/V Tamyang cruise in October 1999. Activities of $^{7}Be,{\;}^{210}Pb,{\;}^{226}Ra,{\;}^{234}Th,{\;}^{238}{\;}and{\;}^{137}Cs$ in sediment samples were determined by non-destructive gamma-ray spectrometry. Rates of sedimentation and particle mixing were estimated by best fitting an advection­diffusion particle mixing model to the data of $^{7}Be,{\;}^{234}Th,{\;}and{\;}^{210}Pb$. Estimated sedimentation rates were 0.06-0.08 cm/yr and particle mixing rates were $0.13-0.65{\;}\textrm{cm}^2/yr$. The use of multiple tracers in our study prevented us from probable up to 38% overestimation of sedimentation rates.

Keywords

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