沿大西洋经向带的真光碘酸盐生产

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Kirsten P. Fentzke, Andrew P. Rees, Glen A. Tarran, Sarah A. Breimann, Jerzy Blusztajn, Sune G. Nielsen, Dalton S. Hardisty
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引用次数: 0

摘要

氧化碘,即碘酸盐,在含氧良好的海水中含量丰富,可以在沉积物中追踪以重建古代的氧可用性。尽管已知现代海洋中碘酸盐和还原性碘化物的空间变化,但对于地球历史上的时间梯度,碘酸盐形成的速率、途径和位置仍然知之甚少。为了量化整个海洋盆地中碘酸盐形成的速率和途径,我们在大西洋经向样带(45°S和37°N)上具有已知碘物种形成梯度的生光水域进行了船上示踪实验。我们在7%和1%的环境表面光照水平下进行孵育,从而跟踪了沿样带的11个站点的深层叶绿素最大值(DCM)的边界。所有孵育用129I (t1/2≈15.7 My)示踪剂加标,并模拟环境条件。我们观察到碘酸盐通过多种途径产生。最常见的观察结果是缺乏显著的碘酸盐产量,在22个地点中,只有7个地点的碘酸盐产量有限,而且几乎只在DCM和氮和铁有限的南大西洋环流之外观察到。根据碘酸129I/127I比值的增加,仅在两个地点推断由碘化物直接氧化形成碘酸盐。在其他地方,碘酸129I/127I比值的下降意味着与替代天然碘池(可能是碘中间体)的快速反应和倾覆是碘酸盐生产的重要因素。我们的工作强调,在大西洋中,碘酸盐生产的速率和途径在空间上是不均匀的。未来的工作需要确定全球海洋盆地的驱动因素、时间变化和趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Euphotic iodate production along an Atlantic Meridional Transect
The oxidized iodine species, iodate, is abundant in well‑oxygenated marine waters and can be tracked in sediments to reconstruct ancient oxygen availability. Despite known modern marine spatial variations in both iodate and reduced iodide, the rates, pathways, and locations of iodate formation remain poorly understood for temporal gradients across Earth history. To quantify rates and pathways of iodate formation across an ocean basin, we performed ship-board tracer experiments in euphotic waters with known gradients in iodine speciation on an Atlantic Meridional Transect (45°S and 37°N). We performed incubations at depths corresponding to 7 % and 1 % of ambient surface light levels, thus tracking the boundaries of the deep chlorophyl maximum (DCM), from 11 stations along the transect. All incubations were spiked with a 129I (t1/2≈15.7 My) tracer and mimicked ambient conditions. We observed iodate production via multiple pathways. The most common observation was a lack of significant iodate production, with iodate production limited to 7 of the 22 locations and nearly exclusively observed at the DCM and outside the nitrogen and iron limited South Atlantic Gyre. Iodate formation from direct iodide oxidation is inferred in only two locations based on increases in iodate 129I/127I ratios. At the other locations, decreases in iodate 129I/127I ratios imply that rapid reactions with and overturning of alternative natural iodine pools, likely iodine intermediates, are an important factor for iodate production. Our work emphasizes that the rates and pathways of iodate production are spatially heterogenous in the Atlantic Ocean. Future work is needed to determine the drivers, temporal variations, and trends within global ocean basins.
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来源期刊
Chemical Geology
Chemical Geology 地学-地球化学与地球物理
CiteScore
7.20
自引率
10.30%
发文量
374
审稿时长
3.6 months
期刊介绍: Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.
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