Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 14, 1215-1233, 2017
https://doi.org/10.5194/bg-14-1215-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
14 Mar 2017
Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake
María Encina Aulló-Maestro1, Peter Hunter1, Evangelos Spyrakos1, Pierre Mercatoris1,2, Attila Kovács3, Hajnalka Horváth3, Tom Preston4, Mátyás Présing3, Jesús Torres Palenzuela5, and Andrew Tyler1 1Biological and Environmental Science, School of Natural Sciences, University of Stirling, Stirling, UK
2Plymouth Marine Laboratory, Plymouth, UK
3Balaton Limnological Institute, MTA Centre for Ecological Research, Tihany, Hungary
4Stable Isotope Biochemistry Laboratory, SUERC, East Kilbride, UK
5Remote Sensing and GIS Laboratory, Department of Applied Physics, Sciences Faculty, University of Vigo, Vigo, Spain
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.

Citation: Aulló-Maestro, M. E., Hunter, P., Spyrakos, E., Mercatoris, P., Kovács, A., Horváth, H., Preston, T., Présing, M., Torres Palenzuela, J., and Tyler, A.: Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake, Biogeosciences, 14, 1215-1233, https://doi.org/10.5194/bg-14-1215-2017, 2017.
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As first study within my PhD with the general objective to improve and adapt remote sensing algorithms for the estimation of coloured dissolved organic matter (CDOM) content in lakes in a global scale, we carried out this set of measurements and experiments. This study gives us a better understanding of sources and variability in the optical properties of CDOM in lakes and how photobleaching controls and affects them.
As first study within my PhD with the general objective to improve and adapt remote sensing...
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