Consumption of dissolved oxygen in the deep Japan Sea, giving a precise isotopic fractionation factor
Consumption of dissolved oxygen in the deep Japan Sea, giving a precise isotopic fractionation factor
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DOI：
10.1029/2007gl029917
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发表时间：
2007-10
影响因子：
5.2
通讯作者：
N. Nakayama;H. Obata;T. Gamo
中科院分区：
文献类型：
--
作者：
N. Nakayama;H. Obata;T. Gamo
测定了2005年5月在日本海东部海域采集的样品中溶解氧的浓度和稳定同位素组成（δ18O）。通过野外观测，采用简单的深水模型，得到了溶解氧消耗过程中溶解氧消耗速率和同位素分馏因子αr。原位氧消耗率是根据先前示踪剂研究中获得的表观氧利用率和深水的周转时间计算的。在2000 m以下深水区，速率为1.2 ~ 1.4 μmol kg−1 yr−1。采用瑞利蒸馏方程对298 ~ 3584 m准深水质量的αr估计为0.9875±0.0003。估算的αr和周转时间表明，封闭的日本海深水团溶解氧δ18O将以0.05 ~ 0.06‰yr - 1的速率增加。
Concentrations and stable isotopic compositions (δ18O) of dissolved O2 in samples collected in May 2005 from the eastern Japan Sea were measured. The O2 consumption rate and the isotopic fractionation factor (αr) during dissolved O2 consumption were obtained from the field observations by applying a simple model to the deep water. The in‐situ O2 consumption rates were calculated from the apparent O2 utilization and the turnover time of deep water obtained in the previous tracer studies. The rates were 1.2–1.4 μmol kg−1 yr−1 in the deep water below 2000 m. The αr estimated was 0.9875 ± 0.0003 applying a Rayleigh distillation equation to the quasi‐deep water mass of 298–3584 m. The estimated αr and the turnover time mean that δ18O of dissolved O2 will increase with a rate of 0.05–0.06‰ yr−1 for the closed Japan Sea deep water mass.