Advances in Earth Science ›› 2020, Vol. 35 ›› Issue (9): 933-947. doi: 10.11867/j.issn.1001-8166.2020.073

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Characterization of Aquatic Dissolved Organic Matter by Spectral Analysis: From Watershed to Deep Ocean

Weidong Guo 1( ),Chao Wang 2,Yan Li 3,Liyin Qu 1,Muchen Lang 1,Yongbin Deng 1,Qinglong Liang 1   

  1. 1.College of Ocean and Earth Sciences,State Key Laboratory of Marine Environmental Science,Xiamen University,Xiamen 361102,China
    2.College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang Guangdong 524088,China
    3.Dongshan Swire Marine Station,Dongshan Fujian 363400,China
  • Received:2020-08-01 Revised:2020-09-03 Online:2020-09-10 Published:2020-10-28
  • About author:Guo Weidong (1968-), male, Meishan City, Sichuan Province, Professor. Research areas include the biogeochemical processes of dissolved organic matter in the aquatic environments. E-mail: wdguo@xmu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China “Utilizing optical and ultrahigh resolution mass spectroscopy to characterize the DOM cycle in the South China Sea, Luzon Strait and West Philippine Sea”(41876083);“The phytoplankton community dynamics and its response to coupling interaction between estuarine plume and coastal upwelling in the Taiwan Strait”(U1805241)

Weidong Guo,Chao Wang,Yan Li,Liyin Qu,Muchen Lang,Yongbin Deng,Qinglong Liang. Characterization of Aquatic Dissolved Organic Matter by Spectral Analysis: From Watershed to Deep Ocean[J]. Advances in Earth Science, 2020, 35(9): 933-947.

Since 1990s, spectral analysis has become an important technique to characterize the properties of chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) from various aquatic systems and a series of spectral indices have been suggested to trace the sources of DOM and their biogeochemical regulation processes. DOM samples were collected from an aquatic continuum from watershed to deep ocean, i.e. Zhangjiang River and Estuary, Dongshan Bay, Taiwan Strait, Northeast basin of the South China Sea, Luzon Strait and the vertical profile of the Kuroshio region of the West Pacific Ocean. This continuum covered many critical interfaces (land-ocean, shelf-basin, marginal sea basin-open ocean and euphotic and aphotic layer). The spatial distribution and variation of various qualitative and quantitative parameters along the continuum were clearly revealed. Combined with literature review, the sources and sinks of CDOM/FDOM and their inherent regulation processes under significant hydrological and biogeochemical gradient variation were systematically summarized. The geochemical differentiation of the quantitative DOM spectral index in various aquatic systems was discussed. The tracing ability of the qualitative DOM spectral index was commented. The coupling study of soil-river organic matter systems, mechanism of mineralization-related microbial production of CDOM/FDOM, quantified geochemical framework concept and perturbation of global change on CDOM/FDOM dynamics were suggested as future key topics.

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