Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem
Poster Presentation - Session 023 - Dynamic DON: The role of organic nitrogen in regulating aquatic ecosystem functioning from land to sea Conference Theme: Mountains to the Sea Primary productivity is limited by the availability of nitrogen (N) in most of the coastal Arctic, as a large portion of N...
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ftunivhongkonghu:oai:hub.hku.hk:10722/240155 2023-05-15T14:48:11+02:00 Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem Bauch, D Thibodeau, B Voss, M 2017 http://hdl.handle.net/10722/240155 eng eng The Association for the Sciences of Limnology and Oceanography (ASLO). United states ASLO 2017 Aquatic Sciences Meeting The ASLO 2017 Aquatic Sciences Meeting, Honolulu, HI., 26 February-3 March 2017. 271811 http://hdl.handle.net/10722/240155 Conference_Paper 2017 ftunivhongkonghu 2023-01-14T16:19:10Z Poster Presentation - Session 023 - Dynamic DON: The role of organic nitrogen in regulating aquatic ecosystem functioning from land to sea Conference Theme: Mountains to the Sea 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 apprehend upcoming changes in the Arctic seas, as increased riverine discharge and permafrost thawing. 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 about 62% of the dissolved organic nitrogen (DON) released by the Lena River is assimilated within the shelf, which represents up to 28% of the yearly new primary productivity over this region. This is a crucial information regarding the near-future impact of climate change on primary productivity in coastal Arctic. Conference Object Arctic Climate change Ice laptev Laptev Sea lena river permafrost Sea ice University of Hong Kong: HKU Scholars Hub Arctic Laptev Sea |
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Open Polar |
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University of Hong Kong: HKU Scholars Hub |
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ftunivhongkonghu |
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English |
description |
Poster Presentation - Session 023 - Dynamic DON: The role of organic nitrogen in regulating aquatic ecosystem functioning from land to sea Conference Theme: Mountains to the Sea 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 apprehend upcoming changes in the Arctic seas, as increased riverine discharge and permafrost thawing. 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 about 62% of the dissolved organic nitrogen (DON) released by the Lena River is assimilated within the shelf, which represents up to 28% of the yearly new primary productivity over this region. This is a crucial information regarding the near-future impact of climate change on primary productivity in coastal Arctic. |
format |
Conference Object |
author |
Bauch, D Thibodeau, B Voss, M |
spellingShingle |
Bauch, D Thibodeau, B Voss, M Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem |
author_facet |
Bauch, D Thibodeau, B Voss, M |
author_sort |
Bauch, D |
title |
Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem |
title_short |
Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem |
title_full |
Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem |
title_fullStr |
Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem |
title_full_unstemmed |
Evidence of dissolved organic Nitrogen assimilation in Arctic Coastal Ecosystem |
title_sort |
evidence of dissolved organic nitrogen assimilation in arctic coastal ecosystem |
publisher |
The Association for the Sciences of Limnology and Oceanography (ASLO). |
publishDate |
2017 |
url |
http://hdl.handle.net/10722/240155 |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Climate change Ice laptev Laptev Sea lena river permafrost Sea ice |
genre_facet |
Arctic Climate change Ice laptev Laptev Sea lena river permafrost Sea ice |
op_relation |
ASLO 2017 Aquatic Sciences Meeting The ASLO 2017 Aquatic Sciences Meeting, Honolulu, HI., 26 February-3 March 2017. 271811 http://hdl.handle.net/10722/240155 |
_version_ |
1766319277610106880 |