基于三维荧光和平行因子分析法的太湖水体CDOM组分光学特征  

Components optical property of CDOM in Lake Taihu based on three-dimensional excitation emission matrix fluorescence

作　　者：黄昌春[1] 李云梅[1] 王桥[1] 施坤[1] 金鑫[1] 王彦飞[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,南京210046

出　　处：《湖泊科学》2010年第3期375-382,共8页Journal of Lake Sciences

基　　金：国家十一五科技支撑计划项目(2008BAC34B05);江苏省2008年度普通高校研究生科研创新计划项目(CX08B_015Z);国家自然科学基金项目(40971215);江苏省2009年度普通高校研究生科研创新计划(CX09B-301Z);南师大优秀博士论文培养计划项目(1243211601036)联合资助

摘　　要：基于2008年11月份太湖全湖69个样点的CDOM三维荧光光谱数据,将平行因子分析法与现有荧光基团相结合,确定CDOM的组成成分及其荧光光谱特征,进一步分析其动力学机制.太湖CDOM荧光基团主要是类腐殖质,其类蛋白质组分可能主要来源于太湖水体生物残骸;同时,类腐殖质荧光发射波长随着荧光强度的增加向长波方向移动,存在"红移"效应.利用平行因子分析法可以将三维荧光矩阵分解为6个主成分,这6种成分可以解释92.48%的变量,平均贡献率分别是PCI占19.709%,PC2占18.685%,PC3占16.914%、PC4占16.62%、PC5占15.514%、PC6占12.558%.275nm处的吸收系数肩值除去受陆源类腐殖质影响外,影响其大小的主要是峰N,其次是峰M;而影响该肩值形状的主要是峰A和N,其次是峰T和M.根据荧光基团的类别,太湖CDOM源类型可以分为四类:①陆源主导类型;②偏陆源主导类型;③偏海源主导类型;④海源主导类型.Parallel factor analysis and known fluorophores were used to characterize and identify the components of CDOM, and the dynamics of CDOM was analyzed further based on the Three-Dimensional Excitation Emission Matrix Fluorescence Spectroscopy （3DEEM） of CDOM measured on Nov. 2008 in Lake Taihu. Humic-like matter was the mainly fluorophores of CDOM. The source of Protein-like maybe the debris of aquatic organism. The emit wavelength of Humic-like moved to the long wavelength with the in- crease of fluorescence intensity, namely, the ＂Red Shift＂ effect. The 3DEEM can be decomposed to six primary components by the parallel factor analysis, and six components can explain 92.48% variation, and the average contribution of six primary components to 3DEEM were 19. 709%（PC1）, 18. 685% （PC2）, 16. 914% （PC3）, 16.62% （PC4）, 15. 514% （PC5） and 12. 558% （PC6） , respectively. The value of absorption shoulder in the 275nm was mainly affected by peak N, following peak M. The main influencing factors of its shape was peak A and N, then peak T and M. The source of CDOM can be divided into four styles according to the fluorophores types： terrestrial dominate style, leaning-terrestrial dominate style, leaning-autochthonous dominate style and autochthonous dominate style.

关 键 词：CDOM 三维荧光光谱 荧光基团 平行因子分析 太湖 

分 类 号：P342[天文地球—水文科学]