Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers
International audience Nutrient supply to the surface ocean is a key factor regulating primary production in the Arctic Ocean under current conditions and with ongoing warming and sea ice losses. Here we present seasonal nitrate concentration and hydrographic data from two oceanographic moorings on...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-04410300 https://hal.science/hal-04410300/document https://hal.science/hal-04410300/file/henley-et-al-2020-nitrate-supply-and-uptake-in-the-atlantic-arctic-sea-ice-zone-seasonal-cycle-mechanisms-and-drivers.pdf https://doi.org/10.1098/rsta.2019.0361 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Henley, Sian, F Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily, J Dumont, Estelle Cottier, Finlo Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers |
topic_facet |
biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Nutrient supply to the surface ocean is a key factor regulating primary production in the Arctic Ocean under current conditions and with ongoing warming and sea ice losses. Here we present seasonal nitrate concentration and hydrographic data from two oceanographic moorings on the northern Barents shelf between autumn 2017 and summer 2018. The eastern mooring was sea ice-covered to varying degrees during autumn, winter and spring, and was characterized by more Arctic-like oceanographic conditions, while the western mooring was ice-free year-round and showed a greater influence of Atlantic water masses. The seasonal cycle in nitrate dynamics was similar under ice-influenced and ice-free conditions, with biological nitrate uptake beginning near-synchronously in early May, but important differences between the moorings were observed. Nitrate supply to the surface ocean preceding and during the period of rapid drawdown was greater at the ice-free more Atlantic-like western mooring, and nitrate drawdown occurred more slowly over a longer period of time. This suggests that with ongoing sea ice losses and Atlantification, the expected shift from more Arctic-like ice-influenced conditions to more Atlantic-like ice-free conditions is likely to increase nutrient availability and the duration of seasonal drawdown in this Arctic shelf region. The extent to which this increased nutrient availability and longer drawdown periods will lead to increases in total nitrate uptake, and support the projected increases in primary production, will depend on changes in upper ocean stratification and their effect on light availability to phytoplankton as changes in climate and the physical environment proceed. This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning'. |
author2 |
School of Geosciences Edinburgh University of Edinburgh Scottish Association for Marine Science (SAMS) Department of Mathematics and Statistics Univ Strathclyde University of Strathclyde Glasgow Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway (UIT) |
format |
Article in Journal/Newspaper |
author |
Henley, Sian, F Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily, J Dumont, Estelle Cottier, Finlo |
author_facet |
Henley, Sian, F Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily, J Dumont, Estelle Cottier, Finlo |
author_sort |
Henley, Sian, F |
title |
Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers |
title_short |
Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers |
title_full |
Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers |
title_fullStr |
Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers |
title_full_unstemmed |
Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers |
title_sort |
nitrate supply and uptake in the atlantic arctic sea ice zone: seasonal cycle, mechanisms and drivers |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-04410300 https://hal.science/hal-04410300/document https://hal.science/hal-04410300/file/henley-et-al-2020-nitrate-supply-and-uptake-in-the-atlantic-arctic-sea-ice-zone-seasonal-cycle-mechanisms-and-drivers.pdf https://doi.org/10.1098/rsta.2019.0361 |
geographic |
Arctic Arctic Ocean Barents Sea |
geographic_facet |
Arctic Arctic Ocean Barents Sea |
genre |
Arctic Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Barents Sea Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Barents Sea Phytoplankton Sea ice |
op_source |
ISSN: 1364-503X EISSN: 1471-2962 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences https://hal.science/hal-04410300 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2020, 378 (2181), pp.20190361. ⟨10.1098/rsta.2019.0361⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1098/rsta.2019.0361 hal-04410300 https://hal.science/hal-04410300 https://hal.science/hal-04410300/document https://hal.science/hal-04410300/file/henley-et-al-2020-nitrate-supply-and-uptake-in-the-atlantic-arctic-sea-ice-zone-seasonal-cycle-mechanisms-and-drivers.pdf doi:10.1098/rsta.2019.0361 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1098/rsta.2019.0361 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
378 |
container_issue |
2181 |
container_start_page |
20190361 |
_version_ |
1792043265078329344 |
spelling |
ftccsdartic:oai:HAL:hal-04410300v1 2024-02-27T08:36:19+00:00 Nitrate supply and uptake in the Atlantic Arctic sea ice zone: seasonal cycle, mechanisms and drivers Henley, Sian, F Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily, J Dumont, Estelle Cottier, Finlo School of Geosciences Edinburgh University of Edinburgh Scottish Association for Marine Science (SAMS) Department of Mathematics and Statistics Univ Strathclyde University of Strathclyde Glasgow Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway (UIT) 2020-08-31 https://hal.science/hal-04410300 https://hal.science/hal-04410300/document https://hal.science/hal-04410300/file/henley-et-al-2020-nitrate-supply-and-uptake-in-the-atlantic-arctic-sea-ice-zone-seasonal-cycle-mechanisms-and-drivers.pdf https://doi.org/10.1098/rsta.2019.0361 en eng HAL CCSD Royal Society, The info:eu-repo/semantics/altIdentifier/doi/10.1098/rsta.2019.0361 hal-04410300 https://hal.science/hal-04410300 https://hal.science/hal-04410300/document https://hal.science/hal-04410300/file/henley-et-al-2020-nitrate-supply-and-uptake-in-the-atlantic-arctic-sea-ice-zone-seasonal-cycle-mechanisms-and-drivers.pdf doi:10.1098/rsta.2019.0361 info:eu-repo/semantics/OpenAccess ISSN: 1364-503X EISSN: 1471-2962 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences https://hal.science/hal-04410300 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2020, 378 (2181), pp.20190361. ⟨10.1098/rsta.2019.0361⟩ biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water biogeochemistry oceanography environmental chemistry nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1098/rsta.2019.0361 2024-01-28T00:01:09Z International audience Nutrient supply to the surface ocean is a key factor regulating primary production in the Arctic Ocean under current conditions and with ongoing warming and sea ice losses. Here we present seasonal nitrate concentration and hydrographic data from two oceanographic moorings on the northern Barents shelf between autumn 2017 and summer 2018. The eastern mooring was sea ice-covered to varying degrees during autumn, winter and spring, and was characterized by more Arctic-like oceanographic conditions, while the western mooring was ice-free year-round and showed a greater influence of Atlantic water masses. The seasonal cycle in nitrate dynamics was similar under ice-influenced and ice-free conditions, with biological nitrate uptake beginning near-synchronously in early May, but important differences between the moorings were observed. Nitrate supply to the surface ocean preceding and during the period of rapid drawdown was greater at the ice-free more Atlantic-like western mooring, and nitrate drawdown occurred more slowly over a longer period of time. This suggests that with ongoing sea ice losses and Atlantification, the expected shift from more Arctic-like ice-influenced conditions to more Atlantic-like ice-free conditions is likely to increase nutrient availability and the duration of seasonal drawdown in this Arctic shelf region. The extent to which this increased nutrient availability and longer drawdown periods will lead to increases in total nitrate uptake, and support the projected increases in primary production, will depend on changes in upper ocean stratification and their effect on light availability to phytoplankton as changes in climate and the physical environment proceed. This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning'. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Barents Sea Phytoplankton Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Barents Sea Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378 2181 20190361 |