Nitrate supply and uptake in the Atlantic 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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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7481658/ http://www.ncbi.nlm.nih.gov/pubmed/32862810 https://doi.org/10.1098/rsta.2019.0361 |
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ftpubmed:oai:pubmedcentral.nih.gov:7481658 2023-05-15T14:43:20+02:00 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 2020-10-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7481658/ http://www.ncbi.nlm.nih.gov/pubmed/32862810 https://doi.org/10.1098/rsta.2019.0361 en eng The Royal Society Publishing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7481658/ http://www.ncbi.nlm.nih.gov/pubmed/32862810 http://dx.doi.org/10.1098/rsta.2019.0361 © 2020 The Authors. http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. CC-BY Philos Trans A Math Phys Eng Sci Articles Text 2020 ftpubmed https://doi.org/10.1098/rsta.2019.0361 2020-09-20T00:32:19Z 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'. Text Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Phytoplankton Sea ice PubMed Central (PMC) Arctic Arctic Ocean Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378 2181 20190361 |
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Articles 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 |
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Articles |
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 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'. |
format |
Text |
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 |
The Royal Society Publishing |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7481658/ http://www.ncbi.nlm.nih.gov/pubmed/32862810 https://doi.org/10.1098/rsta.2019.0361 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Phytoplankton Sea ice |
op_source |
Philos Trans A Math Phys Eng Sci |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7481658/ http://www.ncbi.nlm.nih.gov/pubmed/32862810 http://dx.doi.org/10.1098/rsta.2019.0361 |
op_rights |
© 2020 The Authors. http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
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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1766315002301513728 |