Study of influencing factors to chromophoric dissolved organic matter absorption properties from fluorescence features in Taihu lake in autumn

  • Chuang-Chun Huang | huangchangchun_aaa@163.com Nanjing Normal University, China.
  • Yun-Mei Li Nanjing Normal University, China.
  • Hao Yang Nanjing Normal University, China.
  • De-Yong Sun Nanjing University of Information Science and Technology, China.
  • Liang-Jiang Xu Nanjing Normal University, China.
  • Xia Chen Nanjing Normal University, China.

Abstract

In order to identify the components of chromophoric dissolved organic matter (CDOM), confirm the influence of components to the absorption coefficient of CDOM (aCDOM), and estimate aCDOM from fluorescence spectra, fluorescence and optical measurements of CDOM were carried out in November 2008. The results indicate that, the primary component of CDOM is humic-like. The secondary component is tryptophan-like, which is the product of phytoplankton and aquatic debris rather than the wastewater treatment drainaged from city. In this study, six fluorophores with multiple excitation-emission matrices (EEMs) peaks (A, B, C, N, M, T) were identified according to the parallel factor analysis (PARAFAC). The average contribution of each component to the CDOM is 19.93, 18.82, 16.88, 16.39, 12.26, and 15.72%, respectively. Red Shifted phenomenon will happen with the increase of fluorescence intensity for ultraviolet and terrestrially humic-like. Conversely, marine humic-like will appear Reverse Red Shifted with the increase of fluorescence intensity. The primary contributor to the shoulder value of CDOM’s absorption coefficient at 275 nm is phytoplankton productivity, followed by marine humic-like. The main contributors to the shoulder shape are UV humic-like and phytoplankton productivity, followed by marine humic-like and tryptophan-like. A strong correlation between CDOM absorption and fluorescence intensity at emission wavelength of 424 nm and excitation wavelength ranging from 280 to 360 nm was found. The absorption coefficient can be retrieved successfully from the same excitation wavelength’s fluorescence intensity by an exponential model.


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Author Biography

Chuang-Chun Huang, Nanjing Normal University
water optical, remote sensing
Published
2013-04-26
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Issue
Section
Original Articles
Supporting Agencies
National Science & Technology Support Project of China (No.41201325, No.41271343, No.41030751, No.41103047) - Open Research Fund (key lab. of digital earth) - Center for Earth Observation and digital earth - Chinese Sciences Academy (No.2012LDE009)
Keywords:
chromophoric dissolved organic matter, fluorescence spectroscopy, parallel factor analysis (PARAFAC), remote sensing
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How to Cite
1.
Huang C-C, Li Y-M, Yang H, Sun D-Y, Xu L-J, Chen X. Study of influencing factors to chromophoric dissolved organic matter absorption properties from fluorescence features in Taihu lake in autumn. J Limnol [Internet]. 2013Apr.26 [cited 2020Oct.24];72(2):e26. Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2013.e26