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Open AccessArticle

CDOM Absorption Properties of Natural Water Bodies along Extreme Environmental Gradients

1
Department of Physics, Tibet University, Lhasa 850000, China
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Department of Physics and Technology, University of Bergen, 5020 Bergen, Norway
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Norwegian Institute for Water Research, 0349 Oslo, Norway
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Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
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Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264000, China
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Department of Physics, Makerere University, Kampala 7062, Uganda
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Stevens Institute of Technology, Hoboken, NJ 07030, USA
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Department of Biological Sciences, University of Bergen, 5020 Bergen, Norway
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 1988; https://doi.org/10.3390/w11101988
Received: 11 July 2019 / Revised: 6 September 2019 / Accepted: 15 September 2019 / Published: 24 September 2019
(This article belongs to the Section Aquatic Systems—Quality and Contamination)
We present absorption properties of colored dissolved organic matter (CDOM) sampled in six different water bodies along extreme altitudinal, latitudinal, and trophic state gradients. Three sites are in Norway: the mesotrophic Lysefjord (LF), Samnangerfjord (SF), and Røst Coastal Water (RCW); two sites are in China: the oligotrophic Lake Namtso (LN) and the eutrophic Bohai Sea (BS); and one site is in Uganda: the eutrophic Lake Victoria (LV). The site locations ranged from equatorial to subarctic regions, and they included water types from oligotrophic to eutrophic and altitudes from 0 m to 4700 m. The mean CDOM absorption coefficients at 440 nm [ a CDOM ( 440 ) ] and 320 nm [ a CDOM ( 320 ) ] varied in the ranges 0.063–0.35 m 1 and 0.34–2.28 m 1 , respectively, with highest values in LV, Uganda and the lowest in the high-altitude LN, Tibet. The mean spectral slopes S 280 500 and S 350 500 were found to vary in the ranges of 0.017–0.032 nm 1 and 0.013–0.015 nm 1 , respectively. The highest mean value for S 280 500 as well as the lowest mean value for S 350 500 were found in LN. Scatter plots of S 280 500 versus a CDOM ( 440 ) and a CDOM ( 320 ) values ranges revealed a close connection between RCW, LF, and SF on one side, and BS and LV on the other side. CDOM seems to originate from terrestrial sources in LF, SF, BS, and LV, while RCW is characterized by autochthonous-oceanic CDOM, and LN by autochthonous CDOM. Photobleaching of CDOM is prominent in LN, demonstrated by absorption towards lower wavelengths in the UV spectrum. We conclude that high altitudes, implying high levels of UV radiation and oligotrophic water conditions are most important for making a significant change in CDOM absorption properties. View Full-Text
Keywords: CDOM absorption spectral slope; SR; absorption coefficient; CDOM origin CDOM absorption spectral slope; SR; absorption coefficient; CDOM origin
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MDPI and ACS Style

Nima, C.; Frette, Ø.; Hamre, B.; Stamnes, J.J.; Chen, Y.-C.; Sørensen, K.; Norli, M.; Lu, D.; Xing, Q.; Muyimbwa, D.; Ssenyonga, T.; Stamnes, K.H.; Erga, S.R. CDOM Absorption Properties of Natural Water Bodies along Extreme Environmental Gradients. Water 2019, 11, 1988. https://doi.org/10.3390/w11101988

AMA Style

Nima C, Frette Ø, Hamre B, Stamnes JJ, Chen Y-C, Sørensen K, Norli M, Lu D, Xing Q, Muyimbwa D, Ssenyonga T, Stamnes KH, Erga SR. CDOM Absorption Properties of Natural Water Bodies along Extreme Environmental Gradients. Water. 2019; 11(10):1988. https://doi.org/10.3390/w11101988

Chicago/Turabian Style

Nima, Ciren; Frette, Øyvind; Hamre, Børge; Stamnes, Jakob J.; Chen, Yi-Chun; Sørensen, Kai; Norli, Marit; Lu, Daren; Xing, Qianguo; Muyimbwa, Dennis; Ssenyonga, Taddeo; Stamnes, Knut H.; Erga, Svein R. 2019. "CDOM Absorption Properties of Natural Water Bodies along Extreme Environmental Gradients" Water 11, no. 10: 1988. https://doi.org/10.3390/w11101988

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