獐子岛附近海域溶解有机物的荧光特征

利用平行因子分析(PARAFAC)模型对三维荧光光谱(EEMs)进行解析,研究了獐子岛附近海域不同季节荧光溶解有机物(DOM)荧光的组成特点及分布变化。调查水域在不同季节的DOM荧光组成基本一致,包含类腐殖质荧光组分C1(265/440nm),C2(410～450/520～550nm)和类蛋白荧光组分C3(230,280/330nm),且三者有很好的相关性,表明它们有着相同的来源或彼此间存在某种关系。各组分在不同季节不同水层的分布有在獐子岛周围海域荧光强度相对较大的共同点。通过对各组分与叶绿素a和盐度变化的关系研究发现,调查海区OM受现场浮游植物和人类生产活动的共同作用。分析结果有效的证明了EEMs与PARAFAC相结合对DOM荧光进行分析鉴别的可行性。

Fluorescence characteristics of dissolved organic matter in the sea nearby Zhangzi island

Fluorescence excitation-emission matrix spectroscopy (EEMs) was parsed, using parallel factor analysis (PARAFAC) to parse the model, to examine the fluorescent components and their distributing variations of dissolved organic matter (DOM) sampled from the nearby sea area of Zhangzi island. The identified components in different seasons were almost similar, including humic-like components C1(265/440 nm), C2(410-450/520-550 nm) and protein-like component C3(230, 280/330 nm), and the good linearity proved that they had the same sources or some relationships. Furthermore, all of the 3 components in different water layers and different seasons showed higher fluorescence intensity around the Zhangzi island. The relationships of the 3 components with chlorophyll-a and salinity were discussed, and the results showed that DOM in the study area depended on phytoplankton and the input from human activities. The results demonstrate the capability of the combination of EEMs and PARAFAC for characterizing fluorescence of DOM.