中国东海的<sup>224</sup>Ra

门武; 刘广山; 陈敏; 黄奕普

doi:10.3799/dqkx.2011.106

Volume 36 Issue 6

Jun. 2011

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Article Navigation > Earth Science > 2011 > 36(6): 999-1008

MEN Wu, LIU Guang-shan, CHEN Min, HUANG Yi-pu, 2011. 224Ra in the Seawater of the East China Sea. Earth Science, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106

Citation:

MEN Wu, LIU Guang-shan, CHEN Min, HUANG Yi-pu, 2011. ²²⁴Ra in the Seawater of the East China Sea. Earth Science, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106

MEN Wu, LIU Guang-shan, CHEN Min, HUANG Yi-pu, 2011. 224Ra in the Seawater of the East China Sea. Earth Science, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106

Citation:

MEN Wu, LIU Guang-shan, CHEN Min, HUANG Yi-pu, 2011. ²²⁴Ra in the Seawater of the East China Sea. Earth Science, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106

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²²⁴Ra in the Seawater of the East China Sea

doi: 10.3799/dqkx.2011.106

MEN Wu^{1, 2},
LIU Guang-shan^{1
,
,},
CHEN Min¹,
HUANG Yi-pu¹

1.
College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
2.
Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration (SOA), Third Institute of Oceanography of State Oceanic Administration (SOA), Xiamen 361005, China

Received Date: 2011-03-18
Available Online: 2021-11-10
Publish Date: 2011-06-15

Abstract

Abstract

²²⁴Ra in the seawater of the East China Sea (ECS) were measured using Mn-fiber adsorption—emanation method. The content level and distribution feature of ²²⁴Ra in sea water in summer and winter were studied. The ²²⁴Ra activities were < LLD~5.88Bq/m³ with an average of 0.85Bq/m³ in the summer and < LLD~7.50Bq/m³ with an average of 0.72Bq/m³ in the winter. Both seasons ²²⁴Ra in the surface water have similar distribution and decreased rapidly with the increasing distance from the coast. The high ²²⁴Ra activity at 0.5-7.5Bq/m³ is located within 30-100km offshore and the lowest activity at < 0.13Bq/m³ was in the Kuroshio Current. The ²²⁴Ra concentrations in the middle shelf are 0.13-0.5Bq/m³. The vertical distributions showed two different characteristics. The horizontal and vertical eddy diffusion coefficients calculated by the one-dimensional state model of ²²⁴Ra were (7.1-88.9)×10⁶cm²/s and 2.18-163cm²/s, respectively. The upwelling rates off Zhejiang were calculated using ²²⁴Ra vertical distribution, which varied between (8.4-13.3)×10^-3cm/s in the summer and (16.3-16.8)×10^-3cm/s in the winter.
- East China Sea,
- ²²⁴Ra,
- water mixing,
- upwelling rate,
- marine geology,
- geochemistry

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References(48)

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224Ra in the Seawater of the East China Sea

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²²⁴Ra in the Seawater of the East China Sea