基于三维荧光光谱结合平行因子分析对春季北黄海有色溶解有机物的研究

摘要

This paper conducted fluorescent spectra of dissolved organic matter of Spring China North Yellow Sea by using three-dimensional fluorescence spectroscopy (EEMs)combined with parallel factors analysis (PARAFAC).The results showed that the fluorescent dissolved organic matter (FDOM)in colored dissolved organic matter (CDOM)of North Yellow Sea could be re-solved to four components.Two components,c1 (260,31 5/425)and c2 (295,355/490)were identified as humic-like fluores-cence components while c3 (275/310)and c4 (230,290/345 )were protein-like components.The different linear correlations showed different degrees of similarities in the source or the chemical constitution,the relationship of the humic-like fluorescence components were most closely,followed by protein-like components.Four fluorescent components and total fluorescence intensi-ty (TFI)in the horizontal and vertical directions had a higher intensity in coastal area than that of the area far away from the coast.Additionally,besides terrestrial input,the seawater mass movement also affects the distribution of CDOM in North Yellow Sea.Cluster analysis not only further illustrated the TFI characteristics of different areas of the North Yellow Sea,but also reflects the overall uniformity of the CDOM.Fluorescence Index (FI),Humification Index (HIX)and Biological Index (BIX)at some extent indicated the source of North Yellow Sea CDOM and the conclusion was that the near shore side gets grea-ter influence from terrigenous sources while the sea side is more impacted by biological activity,which matched with the prior distribution patterns of fluorescence components.%利用三维荧光光谱(EEMs)结合平行因子分析(PARAFAC),对我国春季北黄海海水样品的荧光光谱进行了研究和分析。结果表明,北黄海有色溶解有机物(CDOM)中的荧光溶解有机物(FDOM)可分为四个组分,其中两组为类腐殖荧光组分 c1(260,315／425)和 c2(295,355／490),两组为类蛋白荧光组分 c3(275／310)和 c4(230,290／345)。四个组分之间不同程度的线性相关性说明了它们同源相似性,类腐殖质两组分之间的相关性最高,类蛋白质两组分次之。四个荧光组分和总荧光强度在平面分布和垂直分布都呈现近岸高,远岸低的趋势,同时除去陆源输入影响,海洋自身的水团运动和生物活动也影响着北黄海 CDOM 的分布。聚类分析进一步说明了北黄海不同区域的总荧光强度分布特征,也体现了整体上 CDOM 的均一性。荧光指数 FI、腐殖化指数 HIX 和生源指数 BIX 在一定程度上指示了北黄海 CDOM 的来源,说明近岸区域陆源的影响较大,而向海一侧则受生物活动的作用影响较大,此结论与前述荧光组分的分布规律吻合。