Temporal Variability of Dissolved Organic Radiocarbon in the Deep North Pacific Ocean
Temporal Variability of Dissolved Organic Radiocarbon in the Deep North Pacific Ocean
复制标题
北太平洋深海溶解有机放射性碳的时间变化
DOI：
10.1017/rdc.2018.39
复制
发表时间：
2018
期刊：
影响因子：
8.3
通讯作者：
B. Walker
中科院分区：
文献类型：
--
作者：
E. Druffel;S. Griffin;Ning Wang;B. Walker
摘要本文报道了2015年中太平洋北部海水中溶解有机碳（DOC）的含量。混合层（24-81 m）DOC δ 14 C平均值为-235 5 ‰（n=3），深水（1500-5139 m）为-544 5 ‰（n=5）。将这些数据与1985年和1987年NCP发表的两份DOC δ 14 C剖面进行比较，发现深层DOC δ 14 C值有所下降。我们讨论了几种可能的机制，可能会导致这样的转变DOC的14 C值，包括空间不均匀性和时间的变化，由于溶解和14 C值的表面衍生颗粒在深海。我们发现，即将到来的配置文件的DOC 14 C的结果从NCP将确定的主要机制控制深层DOC 14 C的分布，并在过去的三十年中的变化。
ABSTRACT We report marine dissolved organic carbon (DOC) ∆14C from seawater collected from the North central Pacific Ocean (NCP) in 2015. These measurements show DOC ∆14C values averaged –235±5‰ (n=3) in the mixed layer (24–81 m) and –544±5‰ (n=5) in the deep water (1500–5139 m). A comparison of these data with two previously published DOC ∆14C profiles from the NCP in 1985 and 1987 reveals that deep DOC ∆14C values have decreased. We discuss several possible mechanisms that could cause such a shift in DOC ∆14C values, including spatial inhomogeneity and temporal variability due to changes in the dissolution and ∆14C value of surface derived particles in the deep sea. We find that forthcoming profiles of DOC ∆14C results from the NCP will determine the primary mechanisms controlling deep DOC ∆14C distributions, and changes over the past three decades.