Spatiotemporal variability of barium in Arctic sea-ice and seawater
Freshwater export from the Arctic is critical in determining the density of water at sites of North Atlantic deep water formation, which in turn influences the global flux of oceanic heat and nutrients. We need geochemical tracers and high‐resolution observations to refine our freshwater budgets and...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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American Geophysical Union
2018
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Online Access: | http://nora.nerc.ac.uk/id/eprint/520021/ https://nora.nerc.ac.uk/id/eprint/520021/1/Hendry_et_al-2017-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1029/2017JC013668 |
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ftnerc:oai:nora.nerc.ac.uk:520021 2023-05-15T14:26:44+02:00 Spatiotemporal variability of barium in Arctic sea-ice and seawater Hendry, Katharine R. Pyle, Kimberley M. Butler, G. Barney Cooper, Adam Fransson, Agneta Chierici, Melissa Leng, Melanie J. Meyer, Amelie Dodd, Paul A. 2018 text http://nora.nerc.ac.uk/id/eprint/520021/ https://nora.nerc.ac.uk/id/eprint/520021/1/Hendry_et_al-2017-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1029/2017JC013668 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/520021/1/Hendry_et_al-2017-Journal_of_Geophysical_Research__Oceans.pdf Hendry, Katharine R.; Pyle, Kimberley M.; Butler, G. Barney; Cooper, Adam; Fransson, Agneta; Chierici, Melissa; Leng, Melanie J. orcid:0000-0003-1115-5166 Meyer, Amelie; Dodd, Paul A. 2018 Spatiotemporal variability of barium in Arctic sea-ice and seawater. Journal of Geophysical Research: Oceans, 123. https://doi.org/10.1029/2017JC013668 <https://doi.org/10.1029/2017JC013668> cc_by_4 CC-BY Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1029/2017JC013668 2023-02-04T19:46:32Z Freshwater export from the Arctic is critical in determining the density of water at sites of North Atlantic deep water formation, which in turn influences the global flux of oceanic heat and nutrients. We need geochemical tracers and high‐resolution observations to refine our freshwater budgets and constrain models for future change. The use of seawater barium concentrations in the Arctic Ocean as a freshwater tracer relies on the conservative behaviour of barium in seawater; whilst this has been shown to be an unreliable assumption in Arctic summers, there are a lack of studies observing seasonal progressions. Here, we present barium concentrations from seawater and sea‐ice collected during the Norwegian Young Sea ICE expedition from boreal winter into summer. We use other tracers (salinity, oxygen isotopes and alkalinity) to reconstruct freshwater inputs and calculate a barium “deficit” that can be attributed to non‐conservative processes. We locate a deficit in winter when biological production is low, which we attribute to uptake by barite formation associated with old organic matter or by internal sea‐ice processes. We also find a significant barium deficit during the early spring bloom, consistent with uptake into organic‐matter associated microenvironments. However, in summer there no strong barium deficit near the surface, despite high biological production and organic carbon standing stocks, perhaps reflecting phytoplankton assemblage changes, and/or rapid internal cycling. Our findings challenge the assumptions surrounding the use of barium as an Arctic freshwater tracer, and highlight the need to improve our understanding of barium in sea‐ice environments. Article in Journal/Newspaper Arctic Arctic Arctic Ocean North Atlantic Deep Water North Atlantic Phytoplankton Sea ice Natural Environment Research Council: NERC Open Research Archive Arctic Arctic Ocean Journal of Geophysical Research: Oceans 123 5 3507 3522 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Freshwater export from the Arctic is critical in determining the density of water at sites of North Atlantic deep water formation, which in turn influences the global flux of oceanic heat and nutrients. We need geochemical tracers and high‐resolution observations to refine our freshwater budgets and constrain models for future change. The use of seawater barium concentrations in the Arctic Ocean as a freshwater tracer relies on the conservative behaviour of barium in seawater; whilst this has been shown to be an unreliable assumption in Arctic summers, there are a lack of studies observing seasonal progressions. Here, we present barium concentrations from seawater and sea‐ice collected during the Norwegian Young Sea ICE expedition from boreal winter into summer. We use other tracers (salinity, oxygen isotopes and alkalinity) to reconstruct freshwater inputs and calculate a barium “deficit” that can be attributed to non‐conservative processes. We locate a deficit in winter when biological production is low, which we attribute to uptake by barite formation associated with old organic matter or by internal sea‐ice processes. We also find a significant barium deficit during the early spring bloom, consistent with uptake into organic‐matter associated microenvironments. However, in summer there no strong barium deficit near the surface, despite high biological production and organic carbon standing stocks, perhaps reflecting phytoplankton assemblage changes, and/or rapid internal cycling. Our findings challenge the assumptions surrounding the use of barium as an Arctic freshwater tracer, and highlight the need to improve our understanding of barium in sea‐ice environments. |
format |
Article in Journal/Newspaper |
author |
Hendry, Katharine R. Pyle, Kimberley M. Butler, G. Barney Cooper, Adam Fransson, Agneta Chierici, Melissa Leng, Melanie J. Meyer, Amelie Dodd, Paul A. |
spellingShingle |
Hendry, Katharine R. Pyle, Kimberley M. Butler, G. Barney Cooper, Adam Fransson, Agneta Chierici, Melissa Leng, Melanie J. Meyer, Amelie Dodd, Paul A. Spatiotemporal variability of barium in Arctic sea-ice and seawater |
author_facet |
Hendry, Katharine R. Pyle, Kimberley M. Butler, G. Barney Cooper, Adam Fransson, Agneta Chierici, Melissa Leng, Melanie J. Meyer, Amelie Dodd, Paul A. |
author_sort |
Hendry, Katharine R. |
title |
Spatiotemporal variability of barium in Arctic sea-ice and seawater |
title_short |
Spatiotemporal variability of barium in Arctic sea-ice and seawater |
title_full |
Spatiotemporal variability of barium in Arctic sea-ice and seawater |
title_fullStr |
Spatiotemporal variability of barium in Arctic sea-ice and seawater |
title_full_unstemmed |
Spatiotemporal variability of barium in Arctic sea-ice and seawater |
title_sort |
spatiotemporal variability of barium in arctic sea-ice and seawater |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/520021/ https://nora.nerc.ac.uk/id/eprint/520021/1/Hendry_et_al-2017-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1029/2017JC013668 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean North Atlantic Deep Water North Atlantic Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean North Atlantic Deep Water North Atlantic Phytoplankton Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/520021/1/Hendry_et_al-2017-Journal_of_Geophysical_Research__Oceans.pdf Hendry, Katharine R.; Pyle, Kimberley M.; Butler, G. Barney; Cooper, Adam; Fransson, Agneta; Chierici, Melissa; Leng, Melanie J. orcid:0000-0003-1115-5166 Meyer, Amelie; Dodd, Paul A. 2018 Spatiotemporal variability of barium in Arctic sea-ice and seawater. Journal of Geophysical Research: Oceans, 123. https://doi.org/10.1029/2017JC013668 <https://doi.org/10.1029/2017JC013668> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2017JC013668 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
5 |
container_start_page |
3507 |
op_container_end_page |
3522 |
_version_ |
1766300153559384064 |