Seasonal Variation of 228Ra/226Ra Ratio in Surface Water from the East China Sea and the Tsushima Strait
Seasonal Variation of 228Ra/226Ra Ratio in Surface Water from the East China Sea and the Tsushima Strait
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DOI：
10.1007/s10872-010-0036-6
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发表时间：
2010-06-01
影响因子：
2.3
通讯作者：
Yamamoto, Masayoshi
中科院分区：
文献类型：
--
作者：
Inoue, Mutsuo;Nakano, Yusuke;Yamamoto, Masayoshi
在东海东部（ECS）（3个点）和对马海峡（1个点）总共采集了21个地表水样品，并使用低本底伽马能谱法测量了Ra-226和Ra-228活性。样品中的 Ra-228/Ra-226 比率随着盐度 (31.7-34.7) 的变化表现出显着的季节性变化 (Ra-228/Ra-226 = 0.2-2.6)。据推测，ECS 内的季节性水循环通过改变富含 Ra-228 的大陆架水和缺乏 Ra-228 的黑潮水的混合比例来引起这种变化。
A total of 21 surface water samples were collected on the east side of the East China Sea (ECS) (3 sites) and at the Tsushima Strait (1 site), and Ra-226 and Ra-228 activities were measured using low-background gamma-spectrometry. The Ra-228/Ra-226 ratios among the samples exhibited notable seasonal variation (Ra-228/Ra-226 = 0.2-2.6) accompanying changes of salinity (31.7-34.7). Seasonal water circulation within the ECS is hypothesized to cause the change by altering the mixing ratio of Ra-228-rich continental shelf water and Ra-228-poor Kuroshio water.