| 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 |
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| 引用本文： | 黄昌春,李云梅,王桥,施坤,金鑫,王彦飞.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[J].湖泊科学,2010,22(3):375-382. |
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| 作者姓名： | 黄昌春 李云梅 王桥 施坤 金鑫 王彦飞 |
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| 作者单位： | 南京师范大学虚拟地理环境教育部重点实验室,南京,210046 |
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| 基金项目： | 国家科技支撑计划，江苏省普通高校研究生科研创新计划项目，国家自然科学基金，江苏省普通高校研究生科研创新计划，南师大优秀博士论文培养计划项目 |
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| 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.
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| 关 键 词： | 三维荧光光谱 荧光基团 平行因子分析 太湖 |
| 收稿时间： | 4/3/2009 12:00:00 AM |
| 修稿时间： | 2009/11/24 0:00:00 |
Components optical property of CDOM in Lake Taihu based on three-dimensional excita-tion emission matrix fluorescence |
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| HUANG Changchun,LI Yunmei,WANG Qiao,SHI Kun,JIN Xin and WANG Yanfei.Components optical property of CDOM in Lake Taihu based on three-dimensional excita-tion emission matrix fluorescence[J].Journal of Lake Science,2010,22(3):375-382. |
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| Authors: | HUANG Changchun LI Yunmei WANG Qiao SHI Kun JIN Xin and WANG Yanfei |
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| Institution: | Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P. R. China,Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P. R. China,Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P. R. China,Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P. R. China,Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P. R. China and Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P. R. China |
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| Abstract: | Parallel factor analysis and known ftuorophores 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 increase of fluorescence intensity, namely, the "Red Shift" effect. The 3 DEEM 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. |
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| Keywords: | CDOM CDOM 3DEEM fluorophores parallel factor analysis Lake Taihu |
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