Limited iodate reduction in shipboard seawater incubations from the Eastern Tropical North Pacific oxygen deficient zone
Limited iodate reduction in shipboard seawater incubations from the Eastern Tropical North Pacific oxygen deficient zone
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DOI：
10.1016/j.epsl.2020.116676
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发表时间：
2021-01-15
影响因子：
5.3
通讯作者：
Nielsen, S. G.
中科院分区：
文献类型：
--
作者：
Hardisty, D. S.;Horner, T. J.;Nielsen, S. G.
无机碘物种碘化物和碘酸盐的相对丰度被用来表征现代和古代海洋缺氧带（ODZs）。然而，负责原位碘氧化还原转化的速率和机制的特点很差，使碘为基础的氧化还原重建不确定。在这里，我们提供的限制率和机制的碘酸盐减少在东热带北太平洋（ETNP）离岸ODZ使用船上示踪剂孵化方法。从孵育中观察到的碘酸盐还原仅限于氧跃层顶部（σ（θ）类似于25.2 kg m（-3）），此处天然氧浓度较低，但可检测到（约为11 μ M）。来自Oxyline下方额外深度的孵育--其中有O-2
The relative abundance of the inorganic iodine species, iodide and iodate, are applied to characterize both modern and ancient marine oxygen deficient zones (ODZs). However, the rates and mechanisms responsible for in situ iodine redox transformations are poorly characterized, rendering iodine-based redox reconstructions uncertain. Here, we provide constraints on the rates and mechanisms of iodate reduction in the Eastern Tropical North Pacific (ETNP) offshore ODZ using a shipboard tracer-incubation method. Observations of iodate reduction from incubations were limited to the top of the oxycline (sigma(theta) similar to 25.2 kg m(-3)) where native oxygen concentrations were low, but detectable (approximate to 11 mu M). Incubations from additional depths below the oxycline-where O-2 was