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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Photochemical degradation of dissolved organic matter and dissolvedlignin phenols from the Congo River
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Photochemical degradation of dissolved organic matter and dissolvedlignin phenols from the Congo River

机译：刚果河中溶解性有机物和木质素酚的光化学降解

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Photochemical degradation of Congo River dissolved organic matter (DOM) wasinvestigated to examine the fate of terrigenous DOM derived from tropical ecosystems.Tropical riverine DOM receives greater exposure to solar radiation, particularly in largeriver plumes discharging directly into the open ocean. Initial Congo River DOMexhibited dissolved organic carbon (DOC) concentration and compositional characteristicstypical of organic rich blackwater systems. During a 57 day irradiation experiment,Congo River DOM was shown to be highly photoreactive with a decrease in DOC,chromophoric DOM (CDOM), lignin phenol concentrations (E8) and carbon-normalizedyields (A8), equivalent to losses of~45, 85-95, >95 and >95% of initial values,respectively, and a +3.1 %o enrichment of the δ~(13)C-DOC signature. The loss ofA8andenrichment of δ~(13)C-DOC during irradiation was strongly correlated (r = 0.99, p < 0.01)indicating tight coupling between these biomarkers. Furthermore, the loss of CDOMabsorbance was correlated to the loss of ∧8 (e.g., a355 versus ∧8; r = 0.98, p < 0.01) andδ~(13)C-DOC (e.g.,a355versus δ~(13)C; r = 0.97, p < 0.01), highlighting the potential ofCDOM absorbance measurements for delineating the photochemical degradation of ligninand thus terrigenous DOM. It is apparent that these commonly used measurements forexamination of terrigenous DOM in the oceans have a higher rate of photochemical decaythan the bulk DOC pool. Further process-based studies are required to determine theselective removal rates of these biomarkers for advancement of our understandingof the fate of this material in the ocean.
机译：研究了刚果河溶解有机物（DOM）的光化学降解，以研究源自热带生态系统的陆源DOM的命运。热带河流DOM受到太阳辐射的照射更大，特别是在更大的羽流直接排放到公海中。最初的刚果河DOM表现出富含有机黑水系统的溶解有机碳（DOC）浓度和组成特征。在一个为期57天的辐照实验中，刚果河DOM被证明具有高光反应性，DOC，发色DOM（CDOM），木质素酚浓度（E8）和碳归一化产率（A8）降低，相当于损失〜45，85分别是初始值的-95％，> 95％和> 95％，δ〜（13）C-DOC签名的+ 3.1％o富集。辐射过程中A8的丢失和δ〜（13）C-DOC的富集密切相关（r = 0.99，p <0.01），表明这些生物标志物之间紧密结合。此外，CDOM吸光度的损失与to8的损失（例如，a355对∧8; r = 0.98，p <0.01）和δ〜（13）C-DOC（例如，a355对δ〜（13）C; r = 0.97，p <0.01），突出显示了CDOM吸光度测量对木质素和陆源DOM的光化学降解的描绘潜力。显然，这些用于海洋中DOM检验的常用测量方法比大量DOC池具有更高的光化学衰减率。需要进一步的基于过程的研究来确定这些生物标记物的选择性去除率，以促进我们对这种材料在海洋中的命运的了解。

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