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...
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ftunivhongkonghu:oai:hub.hku.hk:10722/240918 2023-05-15T14:46:37+02:00 Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope Voss, M Thibodeau, B Bauch, D 2017 https://doi.org/10.1002/2016GB005593 http://hdl.handle.net/10722/240918 eng eng American Geophysical Union. United States Global Biogeochemical Cycles Global Biogeochemical Cycles, 2017, v. 31 n. 5, p. 836-849 doi:10.1002/2016GB005593 849 272142 0886-6236 5 836 http://hdl.handle.net/10722/240918 31 This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Global Biogeochemical Cycles. Copyright © American Geophysical Union. Published version An edited version of this paper was published by AGU. Copyright (2017) American Geophysical Union. CC-BY-NC-ND Article 2017 ftunivhongkonghu https://doi.org/10.1002/2016GB005593 2023-01-14T16:19:29Z 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. published_or_final_version Article in Journal/Newspaper Arctic Climate change Ice laptev Laptev Sea permafrost Sea ice University of Hong Kong: HKU Scholars Hub Arctic Laptev Sea Global Biogeochemical Cycles 31 5 836 849 |
institution |
Open Polar |
collection |
University of Hong Kong: HKU Scholars Hub |
op_collection_id |
ftunivhongkonghu |
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. published_or_final_version |
format |
Article in Journal/Newspaper |
author |
Voss, M Thibodeau, B Bauch, D |
spellingShingle |
Voss, M Thibodeau, B Bauch, D Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope |
author_facet |
Voss, M Thibodeau, B Bauch, D |
author_sort |
Voss, M |
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 |
American Geophysical Union. |
publishDate |
2017 |
url |
https://doi.org/10.1002/2016GB005593 http://hdl.handle.net/10722/240918 |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Climate change Ice laptev Laptev Sea permafrost Sea ice |
genre_facet |
Arctic Climate change Ice laptev Laptev Sea permafrost Sea ice |
op_relation |
Global Biogeochemical Cycles Global Biogeochemical Cycles, 2017, v. 31 n. 5, p. 836-849 doi:10.1002/2016GB005593 849 272142 0886-6236 5 836 http://hdl.handle.net/10722/240918 31 |
op_rights |
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Global Biogeochemical Cycles. Copyright © American Geophysical Union. Published version An edited version of this paper was published by AGU. Copyright (2017) American Geophysical Union. |
op_rightsnorm |
CC-BY-NC-ND |
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 |
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1766317827662282752 |