Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea
To trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal‐components analyses (PCA) was used on a data set of 13 amino acids released via hydrolyses from a total of 110 water samples from Russian rivers, adjacent near‐shore locations, and the Laptev Sea. The fi...
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crwiley:10.4319/lo.2004.49.1.0148 2024-09-15T17:53:11+00:00 Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea Dittmar, Thorsten 2004 http://dx.doi.org/10.4319/lo.2004.49.1.0148 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2004.49.1.0148 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2004.49.1.0148 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 49, issue 1, page 148-156 ISSN 0024-3590 1939-5590 journal-article 2004 crwiley https://doi.org/10.4319/lo.2004.49.1.0148 2024-08-22T04:15:59Z To trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal‐components analyses (PCA) was used on a data set of 13 amino acids released via hydrolyses from a total of 110 water samples from Russian rivers, adjacent near‐shore locations, and the Laptev Sea. The first component of the PCA distinguished significantly between terrigenous DON from the rivers (1.2 ± 0.1) and marine‐derived DON in the deep central Arctic Ocean (−1.1 ± 0.2). The significance of this distinction was validated with amino acid data from seawater and river samples from other regions. The second PCA component correlated significantly with the proportion of D‐alanine, a tracer for microbial degradation. The percentage of terrigenous DON in the Arctic Ocean was assessed from the first PCA component. The model was calibrated using data from the rivers (100% terrigenous) and the deep central Arctic Ocean (~0% terrigenous) as end members. Terrigenous DON accounted for 28 ± 13% of the total DON on the Laptev Sea shelf, which is in good agreement with independent, lignin‐based estimates. High proportions of terrigenous DON (up to 100%) were calculated for the continental slope down to 2,000 m depth and are probably due to downward convection of brine‐enriched shelf waters. The model presented here provides the first direct evidence of terrigenous DON in the deep sea. The model may be directly applied to trace the fate of terrigenous DON in other terrestrially dominated marine environments. Article in Journal/Newspaper Arctic Ocean laptev Laptev Sea Wiley Online Library Limnology and Oceanography 49 1 148 156 |
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English |
description |
To trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal‐components analyses (PCA) was used on a data set of 13 amino acids released via hydrolyses from a total of 110 water samples from Russian rivers, adjacent near‐shore locations, and the Laptev Sea. The first component of the PCA distinguished significantly between terrigenous DON from the rivers (1.2 ± 0.1) and marine‐derived DON in the deep central Arctic Ocean (−1.1 ± 0.2). The significance of this distinction was validated with amino acid data from seawater and river samples from other regions. The second PCA component correlated significantly with the proportion of D‐alanine, a tracer for microbial degradation. The percentage of terrigenous DON in the Arctic Ocean was assessed from the first PCA component. The model was calibrated using data from the rivers (100% terrigenous) and the deep central Arctic Ocean (~0% terrigenous) as end members. Terrigenous DON accounted for 28 ± 13% of the total DON on the Laptev Sea shelf, which is in good agreement with independent, lignin‐based estimates. High proportions of terrigenous DON (up to 100%) were calculated for the continental slope down to 2,000 m depth and are probably due to downward convection of brine‐enriched shelf waters. The model presented here provides the first direct evidence of terrigenous DON in the deep sea. The model may be directly applied to trace the fate of terrigenous DON in other terrestrially dominated marine environments. |
format |
Article in Journal/Newspaper |
author |
Dittmar, Thorsten |
spellingShingle |
Dittmar, Thorsten Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea |
author_facet |
Dittmar, Thorsten |
author_sort |
Dittmar, Thorsten |
title |
Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea |
title_short |
Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea |
title_full |
Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea |
title_fullStr |
Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea |
title_full_unstemmed |
Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea |
title_sort |
evidence for terrigenous dissolved organic nitrogen in the arctic deep sea |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.4319/lo.2004.49.1.0148 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2004.49.1.0148 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2004.49.1.0148 |
genre |
Arctic Ocean laptev Laptev Sea |
genre_facet |
Arctic Ocean laptev Laptev Sea |
op_source |
Limnology and Oceanography volume 49, issue 1, page 148-156 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2004.49.1.0148 |
container_title |
Limnology and Oceanography |
container_volume |
49 |
container_issue |
1 |
container_start_page |
148 |
op_container_end_page |
156 |
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1810295168573636608 |