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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Online Access: | https://hdl.handle.net/1956/22438 https://doi.org/10.3390/w11101988 |
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ftunivbergen:oai:bora.uib.no:1956/22438 2023-05-15T18:28:38+02:00 CDOM absorption properties of natural water bodies along extreme environmental gradients 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 Erga, Svein Rune 2019-11-20T13:37:55Z application/pdf https://hdl.handle.net/1956/22438 https://doi.org/10.3390/w11101988 eng eng MDPI urn:issn:2073-4441 https://hdl.handle.net/1956/22438 https://doi.org/10.3390/w11101988 cristin:1745468 Attribution CC BY https://creativecommons.org/licenses/by/4.0/ Copyright 2019 The Authors Water CDOM absorption spectral slope SR absorption coefficient CDOM origin Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.3390/w11101988 2023-03-14T17:41:38Z 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) aCDOM(440) ] and 320 nm [ a CDOM (320) aCDOM(320) ] varied in the ranges 0.063–0.35 m −1 −1 and 0.34–2.28 m −1 −1 , respectively, with highest values in LV, Uganda and the lowest in the high-altitude LN, Tibet. The mean spectral slopes S 280−500 S280−500 and S 350−500 S350−500 were found to vary in the ranges of 0.017–0.032 nm −1 −1 and 0.013–0.015 nm −1 −1 , respectively. The highest mean value for S 280−500 S280−500 as well as the lowest mean value for S 350−500 S350−500 were found in LN. Scatter plots of S 280−500 S280−500 versus a CDOM (440) aCDOM(440) and a CDOM (320) aCDOM(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. publishedVersion Article in Journal/Newspaper Subarctic University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway Røst ENVELOPE(11.983,11.983,67.467,67.467) Water 11 10 1988 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
CDOM absorption spectral slope SR absorption coefficient CDOM origin |
spellingShingle |
CDOM absorption spectral slope SR absorption coefficient CDOM origin 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 Erga, Svein Rune CDOM absorption properties of natural water bodies along extreme environmental gradients |
topic_facet |
CDOM absorption spectral slope SR absorption coefficient CDOM origin |
description |
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) aCDOM(440) ] and 320 nm [ a CDOM (320) aCDOM(320) ] varied in the ranges 0.063–0.35 m −1 −1 and 0.34–2.28 m −1 −1 , respectively, with highest values in LV, Uganda and the lowest in the high-altitude LN, Tibet. The mean spectral slopes S 280−500 S280−500 and S 350−500 S350−500 were found to vary in the ranges of 0.017–0.032 nm −1 −1 and 0.013–0.015 nm −1 −1 , respectively. The highest mean value for S 280−500 S280−500 as well as the lowest mean value for S 350−500 S350−500 were found in LN. Scatter plots of S 280−500 S280−500 versus a CDOM (440) aCDOM(440) and a CDOM (320) aCDOM(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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
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 Erga, Svein Rune |
author_facet |
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 Erga, Svein Rune |
author_sort |
Nima, Ciren |
title |
CDOM absorption properties of natural water bodies along extreme environmental gradients |
title_short |
CDOM absorption properties of natural water bodies along extreme environmental gradients |
title_full |
CDOM absorption properties of natural water bodies along extreme environmental gradients |
title_fullStr |
CDOM absorption properties of natural water bodies along extreme environmental gradients |
title_full_unstemmed |
CDOM absorption properties of natural water bodies along extreme environmental gradients |
title_sort |
cdom absorption properties of natural water bodies along extreme environmental gradients |
publisher |
MDPI |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/22438 https://doi.org/10.3390/w11101988 |
long_lat |
ENVELOPE(11.983,11.983,67.467,67.467) |
geographic |
Norway Røst |
geographic_facet |
Norway Røst |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Water |
op_relation |
urn:issn:2073-4441 https://hdl.handle.net/1956/22438 https://doi.org/10.3390/w11101988 cristin:1745468 |
op_rights |
Attribution CC BY https://creativecommons.org/licenses/by/4.0/ Copyright 2019 The Authors |
op_doi |
https://doi.org/10.3390/w11101988 |
container_title |
Water |
container_volume |
11 |
container_issue |
10 |
container_start_page |
1988 |
_version_ |
1766211184025927680 |