Comparison of optical properties of chromophoric dissolved organic matter (CDOM) in alpine lakes above or below the tree line: insights into sources of CDOM

2015 ◽  
Vol 14 (5) ◽  
pp. 1047-1062 ◽  
Author(s):  
Yaling Su ◽  
Feizhou Chen ◽  
Zhengwen Liu
Keyword(s):  
Organic Matter ◽  
Optical Properties ◽  
Dissolved Organic Matter ◽  
Alpine Lakes ◽  
Fluorescence Properties ◽  
Chromophoric Dissolved Organic Matter ◽  
Tree Line ◽  
P Absorption

Absorption and fluorescence properties of CDOM in 15 alpine lakes were investigated to determine its source and composition. This work provides useful information regarding CDOM in above/below-tree-line alpine lakes.

scholarly journals Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

2017 ◽  
Vol 14 (5) ◽  
pp. 1215-1233 ◽  
Author(s):  
María Encina Aulló-Maestro ◽  
Peter Hunter ◽  
Evangelos Spyrakos ◽  
Pierre Mercatoris ◽  
Attila Kovács ◽  
...  
Keyword(s):  
Organic Matter ◽  
Optical Properties ◽  
Dissolved Organic Matter ◽  
Seasonal Variability ◽  
Chromophoric Dissolved Organic Matter ◽  
Lake Balaton ◽  
Spectral Slope ◽  
Marked Variability ◽  
Rich Material ◽  
Development And Validation

Abstract. The development and validation of remote-sensing-based approaches for the retrieval of chromophoric dissolved organic matter (CDOM) concentrations requires a comprehensive understanding of the sources and magnitude of variability in the optical properties of dissolved material within lakes. In this study, spatial and seasonal variability in concentration and composition of CDOM and the origin of its variation was studied in Lake Balaton (Hungary), a large temperate shallow lake in central Europe. In addition, we investigated the effect of photobleaching on the optical properties of CDOM through in-lake incubation experiments. There was marked variability throughout the year in CDOM absorption in Lake Balaton (aCDOM(440) = 0. 06–9.01 m−1). The highest values were consistently observed at the mouth of the main inflow (Zala River), which drains humic-rich material from the adjoining Kis-Balaton wetland, but CDOM absorption decreased rapidly towards the east where it was consistently lower and less variable than in the westernmost lake basins. The spectral slope parameter for the interval of 350–500 nm (SCDOM(350–500)) was more variable with increasing distance from the inflow (observed range 0.0161–0.0181 nm−1 for the mouth of the main inflow and 0.0158–0.0300 nm−1 for waters closer to the outflow). However, spatial variation in SCDOM was more constant exhibiting a negative correlation with aCDOM(440). Dissolved organic carbon (DOC) was strongly positively correlated with aCDOM(440) and followed a similar seasonal trend but it demonstrated more variability than either aCDOM or SCDOM with distance through the system. Photobleaching resulting from a 7-day exposure to natural solar UV radiation resulted in a marked decrease in allochthonous CDOM absorption (7.04 to 3.36 m−1, 42 % decrease). Photodegradation also resulted in an increase in the spectral slope coefficient of dissolved material.

Optical properties of chromophoric dissolved organic matter (CDOM) of water body in Sanyang wetland, China

2018 ◽  
Vol 125 ◽  
pp. 141-147
Author(s):  
Qi Wang ◽  
Ying Liu ◽  
Hengguo Yu ◽  
Qiang Ke ◽  
Chuanhua Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Optical Properties ◽  
Dissolved Organic Matter ◽  
Water Body ◽  
Chromophoric Dissolved Organic Matter
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