Marine sediment as a likely source of methyl and ethyl iodides in subpolar and polar seas
Marine sediment as a likely source of methyl and ethyl iodides in subpolar and polar seas
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海洋沉积物是次极地和极地海洋中甲基和乙基碘的可能来源
DOI：
10.1038/s43247-022-00513-7
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Takatsu Tetsuya
中科院分区：
文献类型：
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作者：
Ooki Atsushi;Minamikawa Keita;Meng Fanxing;Miyashita Naoya;Hirawake Toru;Ueno Hiromichi;Nosaka Yuichi;Takatsu Tetsuya
海洋表层是寿命较长的挥发性有机碘化合物（如甲基碘和乙基碘）的重要来源。然而，它们在深水沃茨的生产受到的限制很少。在这里，我们结合联合收割机船载海水和沉积物岩心分析，调查2017年7月和2018年7月白令海和楚科奇海以及2018年3月至2019年12月日本丰卡湾甲基和乙基碘浓度的时间和垂直分布。我们发现最高的甲基和乙基碘浓度在沉积物孔隙水和沉积物表面。在Funka湾，春季水华和随后植物碎屑沉降到海底之后，沉积物和底层沃茨中的浓度大幅增加。暗培养实验表明，硅藻聚集体是甲基和乙基碘的环境水的来源。我们的研究结果表明，在海底的植物碎屑是一个潜在的来源挥发性有机碘化合物的水柱在极地和副极地沿海海洋。
The surface ocean is an important source of longer-lived volatile organic iodine compounds, such as methyl and ethyl iodide. However, their production in deep waters is poorly constrained. Here, we combine shipborne seawater and sediment core analyses to investigate the temporal and vertical distribution of methyl and ethyl iodide concentrations in the Bering and Chukchi Seas in July 2017 and 2018, and Funka Bay, Japan, between March 2018 and December 2019. We find the highest methyl and ethyl iodide concentrations in sediment porewaters and at the sediment surface. In Funka Bay, concentrations in the sediment and bottom waters strongly increased following the spring bloom and subsequent settling of phytodetritus to the seafloor. Dark incubation experiments suggest that diatom aggregates are a source of methyl and ethyl iodide to the ambient water. Our findings suggest that phytodetritus at the seafloor is a potential source of volatile organic iodine compounds to the water column in polar and subpolar coastal oceans.