Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions
Abstract The Yukon River exports a large amount of dissolved organic carbon (DOC), much of which is colored, absorbing visible and ultraviolet light. Yukon River water typically has low total dissolved nitrogen (TDN), with an average DOC : TDN ratio of 21.1 (mol C mol N −1 ) ~ 200 km upstream from t...
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Online Access: | http://dx.doi.org/10.1002/lno.11706 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11706 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11706 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11706 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11706 |
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crwiley:10.1002/lno.11706 2024-10-06T13:53:23+00:00 Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions Clark, J. Blake Mannino, Antonio Goddard Space Flight Center National Aeronautics and Space Administration 2021 http://dx.doi.org/10.1002/lno.11706 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11706 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11706 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11706 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11706 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 66, issue 5, page 1613-1626 ISSN 0024-3590 1939-5590 journal-article 2021 crwiley https://doi.org/10.1002/lno.11706 2024-09-11T04:10:09Z Abstract The Yukon River exports a large amount of dissolved organic carbon (DOC), much of which is colored, absorbing visible and ultraviolet light. Yukon River water typically has low total dissolved nitrogen (TDN), with an average DOC : TDN ratio of 21.1 (mol C mol N −1 ) ~ 200 km upstream from the coast at Pilot Station, Alaska. TDN has been correlated to the bioavailability of DOC, but a direct estimate of the dependence of DOC reactivity on nutrient availability has not been conducted in the Yukon River delta. The biodegradability of DOC and colored dissolved organic matter (CDOM) was assessed along a gradient within the Yukon River delta and into the coastal ocean. Samples were dark incubated at 20°C and half of the incubations were amended with inorganic nutrients. At five time points through 27 d, CDOM absorption and DOC concentration were measured. Initial DOC concentration was 113–830 μ mol C L −1 and CDOM absorption at 443 nm ( a443 ) ranged from 0.16 to 7.8 m −1 from the ocean to a high CDOM lake. DOC was relatively unreactive, with 3–6% of DOC degrading in riverine samples and little difference between nutrient amended and control incubations. Control river delta a443 decreased 3–10%, while nutrient amended treatments saw a 6–22% decline over 27 d. In the nutrient amended riverine stations, CDOM absorption loss was greater at blue wavelengths and CDOM degradation was greater than total DOC loss. DOC was resistant to biodegradation in both nutrient amended and ambient conditions, while CDOM was preferentially degraded when nutrients were replete. Article in Journal/Newspaper Yukon river Alaska Yukon Wiley Online Library Yukon Limnology and Oceanography 66 5 1613 1626 |
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English |
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Abstract The Yukon River exports a large amount of dissolved organic carbon (DOC), much of which is colored, absorbing visible and ultraviolet light. Yukon River water typically has low total dissolved nitrogen (TDN), with an average DOC : TDN ratio of 21.1 (mol C mol N −1 ) ~ 200 km upstream from the coast at Pilot Station, Alaska. TDN has been correlated to the bioavailability of DOC, but a direct estimate of the dependence of DOC reactivity on nutrient availability has not been conducted in the Yukon River delta. The biodegradability of DOC and colored dissolved organic matter (CDOM) was assessed along a gradient within the Yukon River delta and into the coastal ocean. Samples were dark incubated at 20°C and half of the incubations were amended with inorganic nutrients. At five time points through 27 d, CDOM absorption and DOC concentration were measured. Initial DOC concentration was 113–830 μ mol C L −1 and CDOM absorption at 443 nm ( a443 ) ranged from 0.16 to 7.8 m −1 from the ocean to a high CDOM lake. DOC was relatively unreactive, with 3–6% of DOC degrading in riverine samples and little difference between nutrient amended and control incubations. Control river delta a443 decreased 3–10%, while nutrient amended treatments saw a 6–22% decline over 27 d. In the nutrient amended riverine stations, CDOM absorption loss was greater at blue wavelengths and CDOM degradation was greater than total DOC loss. DOC was resistant to biodegradation in both nutrient amended and ambient conditions, while CDOM was preferentially degraded when nutrients were replete. |
author2 |
Goddard Space Flight Center National Aeronautics and Space Administration |
format |
Article in Journal/Newspaper |
author |
Clark, J. Blake Mannino, Antonio |
spellingShingle |
Clark, J. Blake Mannino, Antonio Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions |
author_facet |
Clark, J. Blake Mannino, Antonio |
author_sort |
Clark, J. Blake |
title |
Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions |
title_short |
Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions |
title_full |
Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions |
title_fullStr |
Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions |
title_full_unstemmed |
Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions |
title_sort |
preferential loss of yukon river delta colored dissolved organic matter under nutrient replete conditions |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11706 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11706 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11706 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11706 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11706 |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Yukon river Alaska Yukon |
genre_facet |
Yukon river Alaska Yukon |
op_source |
Limnology and Oceanography volume 66, issue 5, page 1613-1626 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.11706 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
5 |
container_start_page |
1613 |
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1626 |
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1812182099711492096 |