The Production and Fate of Volatile Organosulfur Compounds in Sulfidic and Ferruginous Sediment
The Production and Fate of Volatile Organosulfur Compounds in Sulfidic and Ferruginous Sediment
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DOI：
10.1029/2019jg005248
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
J. Wilkening;A. Turchyn;K. Redeker;J. Mills;G. Antler;O. Carrión;J. Todd
中科院分区：
文献类型：
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作者：
J. Wilkening;A. Turchyn;K. Redeker;J. Mills;G. Antler;O. Carrión;J. Todd
挥发性有机硫化合物(VOSCs)将海洋和边缘海洋环境中的大气、海洋和陆地硫循环联系在一起。尽管VOSCs在全球生物地球化学硫循环中发挥着重要作用，但人们对当地的地球化学条件如何影响VOSCs的生产和消费知之甚少。本文研究了英国诺福克北部富硫富铁盐沼沉积物中的二甲基硫(DMS)、甲硫醇(MESH)和二甲基硫代丙酸酯(DMSP)。初步结果表明，由于VOSCs的快速降解，最大限度地减少在偏远野外地点采样和实验室分析之间的时间是重要的。通过对不同深度的沉积物进行快速分析，我们观察到了高浓度的DMS、MESH和DMSP，其中表层沉积物的浓度比以前对地表水的研究高出一个数量级。我们测量了Mesh和DMS在不同沉积环境中的浓度和深度分布的系统差异；DMS在铁质沉积物中的浓度较高，而在硫化物沉积物中的浓度较高。通过在短时间内重复测量，我们发现DMS和MESH在铁质沉积物和硫化物沉积物中的降解模式是不同的。我们讨论了在铁质和硫化物沉积物中可能导致观测到的VOSC动力学差异的潜在生物地球化学相互作用。
Volatile organic sulfur compounds (VOSCs) link the atmospheric, marine, and terrestrial sulfur cycles in marine and marginal marine environments. Despite the important role VOSCs play in global biogeochemical sulfur cycling, less is known about how the local geochemical conditions influence production and consumption of VOSCs. We present a study of dimethyl sulfide (DMS), methanethiol (MeSH), and dimethylsulfoniopropionate (DMSP) in sulfide‐rich (sulfidic) and iron‐rich (ferruginous) salt marsh sediment from north Norfolk, UK. Initial results illustrate the importance of minimizing time between sampling in remote field locations and laboratory analysis, due to rapid degradation of VOSCs. With rapid analysis of sediment from different depths, we observe high concentrations of DMS, MeSH, and DMSP, with concentrations in surface sediment an order of magnitude higher than those in previous studies of surface water. We measure systematic differences in the concentration and depth distribution of MeSH and DMS between sediment environments; DMS concentrations are higher in ferruginous sediment, and MeSH concentrations are higher in sulfidic sediment. With repeated measurements over a short time period, we show that the degradation patterns for DMS and MeSH are different in the ferruginous versus sulfidic sediment. We discuss potential biogeochemical interactions that could be driving the observed differences in VOSC dynamics in ferruginous and sulfidic sediment.