Nitrogen isotopic inventory of the Lena River Delta
Permafrost-affected soils around the Arctic Ocean contain a large reservoir of organic matter including nitrogen, which partly reach the river after thawing, degradation and erosion of permafrost. After mobilization, reactive remineralised nitrogen is either used for primary production, microbial pr...
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ftawi:oai:epic.awi.de:56634 2024-09-15T17:54:12+00:00 Nitrogen isotopic inventory of the Lena River Delta Sanders, Tina Fiencke, Claudia Juhls, Bennet Ogneva, Olga Strauss, Jens Tuerena, Robyn Dähnke, Kirstin 2022-05-24 https://epic.awi.de/id/eprint/56634/ https://doi.org/10.5194/egusphere-egu22-12454 https://hdl.handle.net/10013/epic.66ba4f8d-97d5-452f-842b-65601f4d8ce7 unknown Sanders, T. , Fiencke, C. , Juhls, B. orcid:0000-0002-5844-6318 , Ogneva, O. orcid:0000-0002-9309-2076 , Strauss, J. orcid:0000-0003-4678-4982 , Tuerena, R. and Dähnke, K. (2022) Nitrogen isotopic inventory of the Lena River Delta , EGU General Assembly 2022, Vienna, Austria, 23 May 2022 - 27 May 2022 . doi:10.5194/egusphere-egu22-12454 <https://doi.org/10.5194/egusphere-egu22-12454> , hdl:10013/epic.66ba4f8d-97d5-452f-842b-65601f4d8ce7 EPIC3EGU General Assembly 2022, Vienna, Austria, 2022-05-23-2022-05-27Nitrogen isotopic inventory of the Lena River Delta Conference notRev 2022 ftawi https://doi.org/10.5194/egusphere-egu22-12454 2024-06-24T04:28:46Z Permafrost-affected soils around the Arctic Ocean contain a large reservoir of organic matter including nitrogen, which partly reach the river after thawing, degradation and erosion of permafrost. After mobilization, reactive remineralised nitrogen is either used for primary production, microbial processing or is simply transported to coastal waters. With analyzing the natural abundance of the stable isotope composition in different form of nitrogen components, we aim to unravel the balance of transport and biological nitrogen turnover processes like remineralization or nitrification and in consequent the fate of the nitrogen. We have analyzed soil, suspended matter and dissolved inorganic and organic nitrogen for their contents and 15N stable isotope composition to create a baseline for a nitrogen inventory of the Lena River Delta in 2019/2020. We used samples from two transect cruises through the delta in March and August 2019, a monitoring program at Samoylov Island in the central delta (2019/2020), and different soil type samples from Samoylov and Kurunghak Island. Our aim was to determine nitrogen sources, sinks and transformation processes during transport in river and delta. Our data shows that in winter the nitrogen transported from the delta to the Laptev Sea were dominated by dissolved organic nitrogen (DON) and nitrate, which occur in similar amounts of approx. 10 µmol/L. The load of nitrate, during the transect cruise, increased slightly in the delta, while we observed no changes to the isotope values of DON and nitrate indicating a lack of biological activity in the winter season and the lateral transport from soils was the likely source. In summer, nitrogen was mainly transported as DON and particulate nitrogen in the suspended matter and nitrate was mainly below 1µmol/L. The nitrogen stable isotope values of the different nitrogen components ranges between 0.5 and 4.5‰, and were subsequently enriched from the soils via suspended particulate matter (SPM)/sediment and DON to nitrate. These light ... Conference Object Arctic Ocean laptev Laptev Sea lena river permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Permafrost-affected soils around the Arctic Ocean contain a large reservoir of organic matter including nitrogen, which partly reach the river after thawing, degradation and erosion of permafrost. After mobilization, reactive remineralised nitrogen is either used for primary production, microbial processing or is simply transported to coastal waters. With analyzing the natural abundance of the stable isotope composition in different form of nitrogen components, we aim to unravel the balance of transport and biological nitrogen turnover processes like remineralization or nitrification and in consequent the fate of the nitrogen. We have analyzed soil, suspended matter and dissolved inorganic and organic nitrogen for their contents and 15N stable isotope composition to create a baseline for a nitrogen inventory of the Lena River Delta in 2019/2020. We used samples from two transect cruises through the delta in March and August 2019, a monitoring program at Samoylov Island in the central delta (2019/2020), and different soil type samples from Samoylov and Kurunghak Island. Our aim was to determine nitrogen sources, sinks and transformation processes during transport in river and delta. Our data shows that in winter the nitrogen transported from the delta to the Laptev Sea were dominated by dissolved organic nitrogen (DON) and nitrate, which occur in similar amounts of approx. 10 µmol/L. The load of nitrate, during the transect cruise, increased slightly in the delta, while we observed no changes to the isotope values of DON and nitrate indicating a lack of biological activity in the winter season and the lateral transport from soils was the likely source. In summer, nitrogen was mainly transported as DON and particulate nitrogen in the suspended matter and nitrate was mainly below 1µmol/L. The nitrogen stable isotope values of the different nitrogen components ranges between 0.5 and 4.5‰, and were subsequently enriched from the soils via suspended particulate matter (SPM)/sediment and DON to nitrate. These light ... |
format |
Conference Object |
author |
Sanders, Tina Fiencke, Claudia Juhls, Bennet Ogneva, Olga Strauss, Jens Tuerena, Robyn Dähnke, Kirstin |
spellingShingle |
Sanders, Tina Fiencke, Claudia Juhls, Bennet Ogneva, Olga Strauss, Jens Tuerena, Robyn Dähnke, Kirstin Nitrogen isotopic inventory of the Lena River Delta |
author_facet |
Sanders, Tina Fiencke, Claudia Juhls, Bennet Ogneva, Olga Strauss, Jens Tuerena, Robyn Dähnke, Kirstin |
author_sort |
Sanders, Tina |
title |
Nitrogen isotopic inventory of the Lena River Delta |
title_short |
Nitrogen isotopic inventory of the Lena River Delta |
title_full |
Nitrogen isotopic inventory of the Lena River Delta |
title_fullStr |
Nitrogen isotopic inventory of the Lena River Delta |
title_full_unstemmed |
Nitrogen isotopic inventory of the Lena River Delta |
title_sort |
nitrogen isotopic inventory of the lena river delta |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/56634/ https://doi.org/10.5194/egusphere-egu22-12454 https://hdl.handle.net/10013/epic.66ba4f8d-97d5-452f-842b-65601f4d8ce7 |
genre |
Arctic Ocean laptev Laptev Sea lena river permafrost |
genre_facet |
Arctic Ocean laptev Laptev Sea lena river permafrost |
op_source |
EPIC3EGU General Assembly 2022, Vienna, Austria, 2022-05-23-2022-05-27Nitrogen isotopic inventory of the Lena River Delta |
op_relation |
Sanders, T. , Fiencke, C. , Juhls, B. orcid:0000-0002-5844-6318 , Ogneva, O. orcid:0000-0002-9309-2076 , Strauss, J. orcid:0000-0003-4678-4982 , Tuerena, R. and Dähnke, K. (2022) Nitrogen isotopic inventory of the Lena River Delta , EGU General Assembly 2022, Vienna, Austria, 23 May 2022 - 27 May 2022 . doi:10.5194/egusphere-egu22-12454 <https://doi.org/10.5194/egusphere-egu22-12454> , hdl:10013/epic.66ba4f8d-97d5-452f-842b-65601f4d8ce7 |
op_doi |
https://doi.org/10.5194/egusphere-egu22-12454 |
_version_ |
1810430437895438336 |