Chromophoric dissolved organic matter (CDOM) absorption characteristics in relation to fluorescence in Lake Taihu, China, a large shallow subtropical lake

  • Yunlin Zhang
  • Boqiang Qin
  • Guangwei Zhu
  • Lu Zhang
  • Longyuan Yang
Part of the Developments in Hydrobiology book series (DIHY, volume 194)

Abstract

Absorption measurements from chromophoric dissolved organic matter (CDOM) and their relationships with dissolved organic carbon (DOC) and fluorescence were studied in Lake Taihu, a large, shallow, subtropical lake in China. Absorption spectra of lake water samples were measured from 240 nm to 800 nm. Highest values of a(λ), DOC and F n(355) occurred near the river inflow to Meiliang Bay and decreased towards the central lake basin. A significant spatial difference was found between Meiliang Bay and the central lake basin in absorption coefficient, DOC-specific absorption coefficient, exponential slope coefficient, DOC concentration and fluorescence value. The spatial distribution of CDOM suggested that a major part of CDOM in the lake was from river input. CDOM absorption coefficients were correlated with DOC over the wavelength range 280–500 nm, and a(355) was also correlated with F n(355), which showed that CDOM absorption could be inferred from DOC and fluorescence measurement. The coefficient of variation between a(λ) and DOC concentration decreased with increase in wavelength from 240 nm to 800 nm. Furthermore, a significant negative linear relationship was recorded between S value and CDOM absorption coefficient, as well as DOC-specific absorption coefficient. S value and DOC-specific absorption coefficient were used as a proxy for CDOM composition and source. Accurate CDOM absorption measurements are very useful in explaining UV attenuation and in developing, validating remote sensing model of water quality in Lake Taihu.

Keywords

Chromophoric dissolved organic matter (CDOM) Fluorescence Dissolved organic carbon (DOC) DOC-specific absorption coefficient Spectral slope coefficient Lake Taihu 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Yunlin Zhang
    • 1
    • 2
  • Boqiang Qin
    • 1
  • Guangwei Zhu
    • 1
  • Lu Zhang
    • 1
    • 2
  • Longyuan Yang
    • 1
  1. 1.Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjingP. R. China
  2. 2.Graduate school of Chinese Academy of SciencesBeijingP. R. China

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