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...
Published in: | Water |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI AG
2019
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Subjects: | |
Online Access: | https://doi.org/10.3390/w11101988 https://doaj.org/article/d7a31817a8854c669fcc53b241b1da95 |
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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