CDOM Absorption Properties of Natural Water Bodies along Extreme Environmental Gradients

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 sit...

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Bibliographic Details
Published in:Water
Main Authors: Ciren Nima, Øyvind Frette, Børge Hamre, Jakob J. Stamnes, Yi-Chun Chen, Kai Sørensen, Marit Norli, Daren Lu, Qianguo Xing, Dennis Muyimbwa, Taddeo Ssenyonga, Knut H. Stamnes, Svein Rune Erga
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2019
Subjects:
CDOM absorption spectral slope
S R
absorption coefficient
CDOM origin
Hydraulic engineering
TC1-978
Water supply for domestic and industrial purposes
TD201-500
Norway
Røst
Subarctic
Online Access:https://doi.org/10.3390/w11101988
https://doaj.org/article/d7a31817a8854c669fcc53b241b1da95
Description
Summary: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 [ <math display="inline"> <semantics> <mrow> <msub> <mi>a</mi> <mi>CDOM</mi> </msub> <mrow> <mo>(</mo> <mn>440</mn> <mo>)</mo> </mrow> </mrow> </semantics> </math> ] and 320 nm [ <math display="inline"> <semantics> <mrow> <msub> <mi>a</mi> <mi>CDOM</mi> </msub> <mrow> <mo>(</mo> <mn>320</mn> <mo>)</mo> </mrow> </mrow> </semantics> </math> ] varied in the ranges 0.063−0.35 m <math display="inline"> <semantics> <msup> <mrow></mrow> <mrow> <mo>−</mo> <mn>1</mn> </mrow> </msup> </semantics> </math> and 0.34−2.28 m <math display="inline"> <semantics> <msup> <mrow></mrow> <mrow> <mo>−</mo> <mn>1</mn> </mrow> </msup> </semantics> </math> , respectively, with highest values in LV, Uganda and the lowest in the high-altitude LN, Tibet. The mean spectral slopes <math display="inline"> <semantics> <msub> <mi>S</mi> <mrow> <mn>280</mn> <mo>−</mo> <mn>500</mn> </mrow> </msub> </semantics> ...

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