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Optical characterization of CDOM in a marsh-influenced environment in the Changjiang (Yangtze River) Estuary

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Abstract

To elucidate the influence of tidal marshes on the amount and chemical structure of chromophoric dissolved organic matter (CDOM) in adjacent coastal waters, surface water samples were collected along three cross-marsh transects in tidal marshes within the Changjiang Estuary. In addition, three sediment cores were collected from the marshes and incubated for 10 h in the laboratory after adding overlying tidal waters. Nutrients, DOC, absorption, fluorescence excitation–emission matrix (EEM) spectroscopy, and other parameters were measured in these samples, which clearly illustrated releases by the tidal marshes of DOC, and CDOM absorbent and fluorescent molecules. To characterize the chemical nature of the marsh-derived CDOM, variations in a suite of optical indices (including molar absorptivity, absorption spectral slope, fluorescence quantum yield, and fluorescence ratios between certain excitation/emission locations) in these samples were plotted against the offshore distance of the stations as well as the incubation time. From the literature, it has been suggested that these variations are closely associated with molecular weight, aromaticity, and humic/fulvic or allochthonous/autochthonous ratios in the CDOM mixtures. This study showed that the CDOM fluorophores changed to more humic-like and were less protein-like from sea to land across the marsh gradients. Furthermore, subtractions between EEM spectra before and after laboratory incubations were applied to illustrate in greater detail the properties of the pure fluorescent compounds exchanged at the sediment–overlying water interface.

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Acknowledgments

We would like to thank Professor Shouye Yang, Dr. Yajie Sun, and Dr. Guosen Zhang for their help during field and laboratory work. The anonymous reviewers are appreciated for their suggestions, which greatly improved the manuscript. This research was jointly funded by the National Natural Science Foundation of China (No. 40876021), the Project of International Cooperation of China and Netherlands (No. 2008DFB90240), the Program for New Century Excellent Talents in University of China (No. NCET-07-0619), and the fund from Science and Technology Commission of Shanghai Municipality (No. 07R214142).

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Authors and Affiliations

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 North Zhongshan Road, Shanghai, 200062, People’s Republic of China

    Lei Gao & Daoji Li

  2. State Key Laboratory of Marine Geology, Tongji University, 1239 Siping Road, Shanghai, 200092, People’s Republic of China

    Daidu Fan & Jingong Cai

  3. School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai, 200240, People’s Republic of China

    Chengxing Sun

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  1. Lei Gao
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  2. Daidu Fan
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  3. Chengxing Sun
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  4. Daoji Li
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  5. Jingong Cai
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Correspondence to Lei Gao.

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Gao, L., Fan, D., Sun, C. et al. Optical characterization of CDOM in a marsh-influenced environment in the Changjiang (Yangtze River) Estuary. Environ Earth Sci 64, 643–658 (2011). https://doi.org/10.1007/s12665-010-0885-8

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  • DOI: https://doi.org/10.1007/s12665-010-0885-8

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