Direct observation of the rapid turnover of the Japan Sea bottom water by means of AMS radiocarbon measurement
Direct observation of the rapid turnover of the Japan Sea bottom water by means of AMS radiocarbon measurement
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DOI：
10.1029/98gl00359
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发表时间：
1998-03-01
影响因子：
5.2
通讯作者：
Shitashima, K
中科院分区：
文献类型：
--
作者：
Kumamoto, Y;Yoneda, M;Shitashima, K
利用AMS放射性碳测量方法，观测了日本海底层水中C-14在过去16年（1979-1995）中的增加。这一增加是由于表面炸弹放射性碳的渗透，这显然表明日本海底层水的快速周转。周转时间估计约为。100帕，这与其他化学示踪剂获得的结果一致。将估算的转换时间应用于Delta（14）C变化的箱形模型，计算了日本海北方形成底层水的爆炸前表层Delta（14）C约为1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 - 千分之九十
Increase of C-14 in the bottom water of the Japan Sea for the last 16 years (1979-1995) was observed by means of AMS radiocarbon measurement. This increment is due to penetration of surface bomb radiocarbon, which obviously suggests a rapid turnover of the bottom water of the Japan Sea. The turnover time is estimated to be ca. 100 pars which coincides with results obtained by other chemical tracers. By an application of the estimated turnover time to a box model of Delta(14)C change, pre-bomb surface Delta(14)C in the northern Japan Sea where the bottom water is formed is calculated to be ca. -90 parts per thousand.