Low‐molecular‐weight reduced sulfur substances: A major component of nonvolatile dissolved organic sulfur in the Pacific Ocean

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-06-28 DOI:10.1002/lol2.10417
Pierre Fourrier, Gabriel Dulaquais
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Abstract

The low‐molecular‐weight (LMW) reduced sulfur substances (RSS) composition of dissolved organic matter (DOM) was examined along the GEOTRACES US‐GP15 section in the Pacific Ocean. We demonstrate that LMW RSS constitutes a significant fraction of nonvolatile dissolved organic sulfur (DOS). While thiols such as glutathione were below our detection limit (300 pM), RSS containing two carbon (C) sulfur (S) bonds were present at concentrations in the hundreds of nM range. RSS accumulation was observed in subtropical waters. The most likely source of these RSS is microbial alteration of sulfurized DOM with production of secondary thioamidated metabolites. RSS are initially produced by cyanobacteria to mitigate copper and oxidative stress induced by UV‐B irradiance. A preferential remineralization of RSS over dissolved organic carbon (DOC) in the upper 350 m suggests a partial lability of LMW DOS. Deeper, homogeneous concentrations and C : S ratio indicate increasing stability of this LMW DOS.
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低分子量还原硫物质:太平洋非挥发性溶解有机硫的主要成分
沿太平洋 GEOTRACES US-GP15 断面研究了溶解有机物(DOM)中的低分子量还原硫物质(RSS)组成。我们证明,低分子量还原硫物质在非挥发性溶解有机硫(DOS)中占有很大比例。谷胱甘肽等硫醇的浓度低于我们的检测极限(300 pM),而含有两个碳(C)硫(S)键的 RSS 的浓度则在数百 nM 的范围内。在亚热带水域观察到了 RSS 的积累。这些 RSS 的最可能来源是微生物改变硫化 DOM,产生二级硫代酰胺代谢物。RSS 最初由蓝藻产生,以减轻紫外线-B 照射引起的铜和氧化压力。在上层 350 米处,RSS 比溶解有机碳(DOC)更倾向于再矿化,这表明 LMW DOS 存在部分不稳定性。更深层的均质浓度和 C : S 比率表明这种低分子有机碳的稳定性在增加。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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