Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope
Primary productivity is limited by the availability of nitrogen (N) in most of the coastal Arctic, as a large portion of N is released by the spring freshet and completely consumed during the following summer. Thus, understanding the fate of riverine nitrogen is critical to identify the link between...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AGU (American Geophysical Union)
2017
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/37745/ https://oceanrep.geomar.de/id/eprint/37745/7/gbc20542%282%29.pdf https://doi.org/10.1002/2016GB005593 |
id |
ftoceanrep:oai:oceanrep.geomar.de:37745 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:37745 2023-05-15T14:25:37+02:00 Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope Thibodeau, Benoit Bauch, Dorothea Voss, Maren 2017-05-13 text https://oceanrep.geomar.de/id/eprint/37745/ https://oceanrep.geomar.de/id/eprint/37745/7/gbc20542%282%29.pdf https://doi.org/10.1002/2016GB005593 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/37745/7/gbc20542%282%29.pdf Thibodeau, B., Bauch, D. and Voss, M. (2017) Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope. Open Access Global Biogeochemical Cycles, 31 (5). pp. 836-849. DOI 10.1002/2016GB005593 <https://doi.org/10.1002/2016GB005593>. doi:10.1002/2016GB005593 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.1002/2016GB005593 2023-04-07T15:32:59Z Primary productivity is limited by the availability of nitrogen (N) in most of the coastal Arctic, as a large portion of N is released by the spring freshet and completely consumed during the following summer. Thus, understanding the fate of riverine nitrogen is critical to identify the link between dissolved nitrogen dynamic and coastal primary productivity to foresee upcoming changes in the Arctic seas, such as increase riverine discharge and permafrost thaw. Here, we provide a field-based study of nitrogen dynamic over the Laptev Sea shelf based on isotope geochemistry. We demonstrate that while most of the nitrate found under the surface fresh water layer is of remineralized origin, some of the nitrate originates from atmospheric input and was probably transported at depth by the mixing of brine-enriched denser water during sea-ice formation. Moreover, our results suggest that riverine dissolved organic nitrogen (DON) represents up to 6 times the total riverine release of nitrate and that about 62 to 76% of the DON is removed within the shelf waters. This is a crucial information regarding the near-future impact of climate change on primary productivity in the Eurasian coastal Arctic. Article in Journal/Newspaper Arctic Arctic Climate change Ice laptev Laptev Sea permafrost Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Laptev Sea Global Biogeochemical Cycles 31 5 836 849 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Primary productivity is limited by the availability of nitrogen (N) in most of the coastal Arctic, as a large portion of N is released by the spring freshet and completely consumed during the following summer. Thus, understanding the fate of riverine nitrogen is critical to identify the link between dissolved nitrogen dynamic and coastal primary productivity to foresee upcoming changes in the Arctic seas, such as increase riverine discharge and permafrost thaw. Here, we provide a field-based study of nitrogen dynamic over the Laptev Sea shelf based on isotope geochemistry. We demonstrate that while most of the nitrate found under the surface fresh water layer is of remineralized origin, some of the nitrate originates from atmospheric input and was probably transported at depth by the mixing of brine-enriched denser water during sea-ice formation. Moreover, our results suggest that riverine dissolved organic nitrogen (DON) represents up to 6 times the total riverine release of nitrate and that about 62 to 76% of the DON is removed within the shelf waters. This is a crucial information regarding the near-future impact of climate change on primary productivity in the Eurasian coastal Arctic. |
format |
Article in Journal/Newspaper |
author |
Thibodeau, Benoit Bauch, Dorothea Voss, Maren |
spellingShingle |
Thibodeau, Benoit Bauch, Dorothea Voss, Maren Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
author_facet |
Thibodeau, Benoit Bauch, Dorothea Voss, Maren |
author_sort |
Thibodeau, Benoit |
title |
Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
title_short |
Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
title_full |
Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
title_fullStr |
Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
title_full_unstemmed |
Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
title_sort |
nitrogen dynamic in eurasian coastal arctic ecosystem: insight from nitrogen isotope |
publisher |
AGU (American Geophysical Union) |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/37745/ https://oceanrep.geomar.de/id/eprint/37745/7/gbc20542%282%29.pdf https://doi.org/10.1002/2016GB005593 |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Arctic Climate change Ice laptev Laptev Sea permafrost Sea ice |
genre_facet |
Arctic Arctic Climate change Ice laptev Laptev Sea permafrost Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/37745/7/gbc20542%282%29.pdf Thibodeau, B., Bauch, D. and Voss, M. (2017) Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope. Open Access Global Biogeochemical Cycles, 31 (5). pp. 836-849. DOI 10.1002/2016GB005593 <https://doi.org/10.1002/2016GB005593>. doi:10.1002/2016GB005593 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016GB005593 |
container_title |
Global Biogeochemical Cycles |
container_volume |
31 |
container_issue |
5 |
container_start_page |
836 |
op_container_end_page |
849 |
_version_ |
1766298067168919552 |