Evidence for terrigenous dissolved organic nitrogen in the Arctic deep-sea
In order to trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal component 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....
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ftawi:oai:epic.awi.de:8732 2023-09-05T13:15:40+02:00 Evidence for terrigenous dissolved organic nitrogen in the Arctic deep-sea Dittmar, T. 2004 https://epic.awi.de/id/eprint/8732/ https://hdl.handle.net/10013/epic.19258 unknown Dittmar, T. (2004) Evidence for terrigenous dissolved organic nitrogen in the Arctic deep-sea , Limnology and oceanography, 49 (1), pp. 148-156 . hdl:10013/epic.19258 EPIC3Limnology and oceanography, 49(1), pp. 148-156 Article isiRev 2004 ftawi 2023-08-22T19:47:36Z In order to trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal component 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 the rivers (100% terrigenous) and the deep central Arctic Ocean (approximately 0% terrigenous) as endmembers. 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 2000 m water 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. It may be directly applied to trace the fate of terrigenous DON in other terrestrially dominated marine environments. Article in Journal/Newspaper Arctic Arctic Arctic Ocean laptev Laptev Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Laptev Sea |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
In order to trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal component 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 the rivers (100% terrigenous) and the deep central Arctic Ocean (approximately 0% terrigenous) as endmembers. 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 2000 m water 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. It may be directly applied to trace the fate of terrigenous DON in other terrestrially dominated marine environments. |
format |
Article in Journal/Newspaper |
author |
Dittmar, T. |
spellingShingle |
Dittmar, T. Evidence for terrigenous dissolved organic nitrogen in the Arctic deep-sea |
author_facet |
Dittmar, T. |
author_sort |
Dittmar, T. |
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 |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/8732/ https://hdl.handle.net/10013/epic.19258 |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Arctic Ocean laptev Laptev Sea |
genre_facet |
Arctic Arctic Arctic Ocean laptev Laptev Sea |
op_source |
EPIC3Limnology and oceanography, 49(1), pp. 148-156 |
op_relation |
Dittmar, T. (2004) Evidence for terrigenous dissolved organic nitrogen in the Arctic deep-sea , Limnology and oceanography, 49 (1), pp. 148-156 . hdl:10013/epic.19258 |
_version_ |
1776197528036835328 |