Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers
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 sh...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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2020
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Online Access: | https://pure.uhi.ac.uk/en/publications/9b4ad114-5f81-492c-9b1a-d95a3eba29f0 https://doi.org/10.1098/rsta.2019.0361 https://pureadmin.uhi.ac.uk/ws/files/14208590/rsta.2019.0361.pdf |
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ftuhipublicatio:oai:pure.atira.dk:publications/9b4ad114-5f81-492c-9b1a-d95a3eba29f0 2024-06-23T07:48:40+00:00 Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers Henley, Sian F. Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily Joanne Dumont, Estelle Cottier, Finlo 2020-10-02 application/pdf https://pure.uhi.ac.uk/en/publications/9b4ad114-5f81-492c-9b1a-d95a3eba29f0 https://doi.org/10.1098/rsta.2019.0361 https://pureadmin.uhi.ac.uk/ws/files/14208590/rsta.2019.0361.pdf eng eng https://pure.uhi.ac.uk/en/publications/9b4ad114-5f81-492c-9b1a-d95a3eba29f0 info:eu-repo/semantics/openAccess Henley , S F , Porter , M , Hobbs , L , Braun , J , Guillaume-Castel , R , Venables , E J , Dumont , E & Cottier , F 2020 , ' Nitrate supply and uptake in the Arctic sea ice zone: seasonal cycle, mechanisms and drivers ' , Philosophical Transactions of the Royal Society of London Series A-Mathematical, Physical and Engineering Sciences , vol. 378 , no. 2181 . https://doi.org/10.1098/rsta.2019.0361 nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water article 2020 ftuhipublicatio https://doi.org/10.1098/rsta.2019.0361 2024-06-10T23:47:56Z 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 characterised by more Arctic-like oceanographic conditions, whilst 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. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Barents Sea Phytoplankton Sea ice University of the Highlands and Islands: Research Database of UHI Arctic Arctic Ocean Barents Sea Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378 2181 20190361 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water |
spellingShingle |
nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water Henley, Sian F. Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily Joanne Dumont, Estelle Cottier, Finlo Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
topic_facet |
nutrients nitrate sea ice Arctic Ocean Barents Sea Atlantic water |
description |
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 characterised by more Arctic-like oceanographic conditions, whilst 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. |
format |
Article in Journal/Newspaper |
author |
Henley, Sian F. Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily Joanne Dumont, Estelle Cottier, Finlo |
author_facet |
Henley, Sian F. Porter, Marie Hobbs, Laura Braun, Judith Guillaume-Castel, Robin Venables, Emily Joanne Dumont, Estelle Cottier, Finlo |
author_sort |
Henley, Sian F. |
title |
Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
title_short |
Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
title_full |
Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
title_fullStr |
Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
title_full_unstemmed |
Nitrate supply and uptake in the Arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
title_sort |
nitrate supply and uptake in the arctic sea ice zone:: seasonal cycle, mechanisms and drivers |
publishDate |
2020 |
url |
https://pure.uhi.ac.uk/en/publications/9b4ad114-5f81-492c-9b1a-d95a3eba29f0 https://doi.org/10.1098/rsta.2019.0361 https://pureadmin.uhi.ac.uk/ws/files/14208590/rsta.2019.0361.pdf |
geographic |
Arctic Arctic Ocean Barents Sea |
geographic_facet |
Arctic Arctic Ocean Barents Sea |
genre |
Arctic Arctic Arctic Ocean Barents Sea Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Barents Sea Phytoplankton Sea ice |
op_source |
Henley , S F , Porter , M , Hobbs , L , Braun , J , Guillaume-Castel , R , Venables , E J , Dumont , E & Cottier , F 2020 , ' Nitrate supply and uptake in the Arctic sea ice zone: seasonal cycle, mechanisms and drivers ' , Philosophical Transactions of the Royal Society of London Series A-Mathematical, Physical and Engineering Sciences , vol. 378 , no. 2181 . https://doi.org/10.1098/rsta.2019.0361 |
op_relation |
https://pure.uhi.ac.uk/en/publications/9b4ad114-5f81-492c-9b1a-d95a3eba29f0 |
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 |
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1802639008159760384 |