230Th in the Andaman Sea: Rapid deep‐sea renewal
230Th in the Andaman Sea: Rapid deep‐sea renewal
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安达曼海第 230 次：深海快速更新
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
H. Minami
中科院分区：
文献类型：
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作者：
A. Okubo;H. Obata;Y. Nozaki;Yoshiyuki Yamamoto;H. Minami
测定了孟加拉湾和安达曼海海水中~（230）Th的活度。安达曼海是一个半封闭的盆地，被安达曼-尼科巴海岭与孟加拉湾隔离开来。安达曼海~（230）Th活度垂直分布的显著趋势是1250 m以下的均匀性。我们将清除混合模型应用于安达曼海的垂直剖面，并估计更新时间的上限为6年。我们比较了不同大洋盆地深水沃茨中210 Pb/226 Ra比值，以限制230 Th作为深水更新示踪剂的应用。安达曼海深水和孟加拉湾流入水的210 Pb/226 Ra比值几乎相同，表明安达曼海深水被迅速替换，而对210 Pb/226 Ra比值没有底部清除作用。
230Th activities were determined in seawater collected from the Bay of Bengal and the Andaman Sea. The Andaman Sea is a semi‐closed basin that is isolated from the Bay of Bengal by the Andaman‐Nicobar Ridge. The noticeable trend in the vertical distribution of 230Th activity in the Andaman Sea is its uniformity below 1250 m depth. We applied the scavenging‐mixing model to this vertical profile in the Andaman Sea, and estimated the upper limit of renewal time to be 6 yr. We compared 210Pb/226Ra ratios among deep waters of various oceanic basins to constrain the application of 230Th as a tracer of deep‐water renewal. The 210Pb/226Ra ratios were almost identical for the deep‐water of the Andaman Sea and the inflow water from the Bay of Bengal, suggesting that the deep water in the Andaman Sea is replaced rapidly without bottom scavenging effects on the 210Pb/226Ra ratio.