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• W4320180887 endingPage "119732" @default.
• W4320180887 startingPage "119732" @default.
• W4320180887 abstract "Cold seeps with methane-rich fluids leaking out of the seafloor usually support massive biomass of chemosynthetic organisms and associated fauna. A substantial amount of methane is converted to dissolved inorganic carbon by microbial metabolism, and this process also releases dissolved organic matter (DOM) into pore water. Here, pore water samples from “Haima cold seeps” sediments and the non-seep reference sediments in the northern South China Sea were analyzed for optical properties and molecular compositions of pore water DOM. Our results showed that the relative abundance of protein-like DOM, H/Cwa and molecular lability boundary percentage (MLBL%) in the seep sediments were significantly higher than those in the reference sediments, indicating that more labile DOM related to unsaturated aliphatic compounds is produced in the seep sediments. Spearman's correlation of the fluoresce and molecular data suggested that the humic-like components (C1 and C2) mainly constituted the refractory compounds (CRAM, highly unsaturated and aromatics compounds). In contrast, the protein-like component (C3) had high H/C ratios featuring high degree of DOM lability. The amount of S-containing formulas (CHOS and CHONS) was greatly elevated in the seep sediments, likely caused by abiotic and biotic sulfurization of DOM in the sulfidic environment. Although the abiotic sulfurization was proposed to have a stabilizing effect on organic matter, our results implied that the biotic sulfurization in the cold seep sediments would increase DOM lability. Overall, the labile DOM accumulated in the seep sediments is closely linked to methane oxidation, which not only support heterotrophic communities and but also likely have an impact on carbon and sulfur cycling in the sediments and the ocean." @default.
• W4320180887 created "2023-02-13" @default.
• W4320180887 creator A5009790298 @default.
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• W4320180887 date "2023-04-01" @default.
• W4320180887 modified "2023-10-18" @default.
• W4320180887 title "Molecular evidence for the production of labile, sulfur-bearing dissolved organic matter in the seep sediments of the South China Sea" @default.
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• W4320180887 doi "https://doi.org/10.1016/j.watres.2023.119732" @default.
• W4320180887 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36801578" @default.
• W4320180887 hasPublicationYear "2023" @default.
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