scholarly journals Hourly, daily, and seasonal variability in the absorption spectra of chromophoric dissolved organic matter in a eutrophic, humic lake

2014 ◽  
Vol 119 (10) ◽  
pp. 1985-1998 ◽  
Author(s):  
R. A. Müller ◽  
D. N. Kothawala ◽  
E. Podgrajsek ◽  
E. Sahlée ◽  
B. Koehler ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Absorption Spectra ◽  
Seasonal Variability ◽  
Chromophoric Dissolved Organic Matter ◽  
Humic Lake

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.

Seasonal variability in chromophoric dissolved organic matter in the Sakawa River and Sagami Bay, Japan

Limnology ◽  
2007 ◽  
Vol 8 (3) ◽  
pp. 211-217 ◽  
Author(s):  
Akira Koyama ◽  
Victor S. Kuwahara ◽  
Akira Shibata ◽  
Tatsuki Toda ◽  
Tomohiko Kikuchi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Seasonal Variability ◽  
Chromophoric Dissolved Organic Matter ◽  
Sagami Bay
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