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首页> 外文期刊>Marine Chemistry >Composition of dissolved organic matter along an Atlantic Meridional Transect from fluorescence spectroscopy and Parallel Factor Analysis
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Composition of dissolved organic matter along an Atlantic Meridional Transect from fluorescence spectroscopy and Parallel Factor Analysis

机译：沿大西洋子午线样线溶解的有机物的荧光光谱和平行因子分析

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Absorption spectra and induced fluorescence excitation emission matrices of colored dissolved organic matter were measured in water samples collected along the Atlantic Meridional Transect in different bio-geographic provinces of the Atlantic Ocean from October to November 2010. The highest values of CDOM absorption coefficient at 305 nm (a_CDOM(305)), were recorded at the continental margins of the English Channel and Patagonian Shelf. The lowest values of a_CDOM(305) were observed in the mixed layer of both North and South Atlantic subtropical oligotrophic gyres. The DOM composition was assessed using fluorescence spectroscopy, Excitation Emission Matrix spectra (EEMs) and the Parallel Factor Analysis (PARAFAC) model in addition to spectral indices calculated from CDOM absorption spectrum and EEMs. Six different components were identified in the EEMs by PARAFAC: Two components were similar to the humic-like fraction of DOM, associated with basin scale microbial mineralization processes. These components represent allochthonous DOM in the biogeographic provinces studied. One component of marine humic-like material of autochthonous origin was associated with DOM production from marine phytoplankton. Three components were associated with protein-like DOM. Two protein-like components had the spectral characteristics of pure tryptophan and tyrosine. There was a significant difference in DOM composition both between bio-geographical provinces and above and below the mixed layer. In the mixed layer in all provinces, except the waters of the Western European Shelf, the DOM was dominated by protein-like components. At the Western European Shelf, it was dominated by humic-like components. Fluorescence intensities of humic-like components were high at the Patagonian Shelf, but were up to 40% lower compared to northern hemisphere shelf waters. Humic-like components made a significant contribution to the DOM composition of the upper mesopelagic layer in all provinces, with the highest values at the Equatorial Upwelling Zone. There was a significant inverse relationship between humic-like components and salinity and temperature and a positive relationship with Apparent Oxygen Utilization. The humification index (HIX) was linearly correlated with the intensity of the humic-like DOM components. These trends suggest that the humic-like components are in dynamic equilibrium between likely microbial production in the deep ocean and photochemical degradation in the mixed layer.
机译：2010年10月至2010年11月在大西洋不同生物地理省沿大西洋子午线样采集的水样中测量了有色溶解有机物的吸收光谱和诱导的荧光激发发射矩阵。CDOM吸收系数的最大值在305 nm处（a_CDOM（305）），记录在英吉利海峡和巴塔哥尼亚大陆架的大陆边缘。在北大西洋和南大西洋亚热带贫营养旋涡的混合层中观察到了最低的a_CDOM（305）值。除了从CDOM吸收光谱和EEM计算得出的光谱指数外，还使用荧光光谱，激发发射矩阵光谱（EEM）和平行因子分析（PARAFAC）模型评估DOM的组成。 PARAFAC在EEM中确定了六个不同的组成部分：两个组成部分类似于DOM的腐殖质样部分，与盆地规模的微生物成矿过程有关。这些组成部分代表了所研究的生物地理省份中的异源DOM。本地腐殖质类海洋腐殖质材料的一个成分与海洋浮游植物产生的DOM有关。三个成分与蛋白样DOM相关。两个蛋白样成分具有纯色氨酸和酪氨酸的光谱特征。在生物地理省之间以及混合层的上方和下方，DOM组成均存在显着差异。在除西欧大陆架水域以外的所有省份的混合层中，DOM均以类蛋白质成分为主。在西欧大陆架，它以腐殖质样成分为主。在巴塔哥尼亚大陆架上，类腐殖质组分的荧光强度很高，但与北半球陆架水相比，却降低了40％。类似腐殖质的成分对所有省的中上弹性层的DOM组成做出了重大贡献，赤道上升区的值最高。腐殖质样成分与盐度和温度之间存在显着的负相关关系，与表观氧气利用率呈正相关关系。腐殖化指数（HIX）与类腐殖质DOM成分的强度线性相关。这些趋势表明，腐殖质样成分在深海中可能的微生物产生与混合层中的光化学降解之间处于动态平衡。

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