A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)

Publisher policy: author can archive post-print on open access repository after an embargo period of 12 months. Cobalt (Co) and iron (Fe) are essential for phytoplankton nutrition, and as such constitute a vital link in the marine biological carbon pump. Atmospheric deposition is an important, and i...

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Published in:Progress in Oceanography
Main Authors: Shelley, RU, Wyatt, NJ, Tarran, GA, Rees, AP, Worsfold, PJ, Lohan, MC
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier BV 2017
Subjects:
Online Access:http://hdl.handle.net/10026.1/9630
https://doi.org/10.1016/j.pocean.2016.10.013
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spelling ftunivplympearl:oai:pearl.plymouth.ac.uk:10026.1/9630 2024-06-09T07:48:07+00:00 A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19) Shelley, RU Wyatt, NJ Tarran, GA Rees, AP Worsfold, PJ Lohan, MC 2017 52-64 application/pdf http://hdl.handle.net/10026.1/9630 https://doi.org/10.1016/j.pocean.2016.10.013 en eng Elsevier BV ISSN:0079-6611 0079-6611 http://hdl.handle.net/10026.1/9630 doi:10.1016/j.pocean.2016.10.013 2017-11-27 Not known 37 Earth Sciences 3708 Oceanography 3701 Atmospheric Sciences journal-article Article 2017 ftunivplympearl https://doi.org/10.1016/j.pocean.2016.10.013 2024-05-14T23:44:04Z Publisher policy: author can archive post-print on open access repository after an embargo period of 12 months. Cobalt (Co) and iron (Fe) are essential for phytoplankton nutrition, and as such constitute a vital link in the marine biological carbon pump. Atmospheric deposition is an important, and in some places the dominant, source of trace elements (TEs) to the global ocean. Dissolved cobalt (dCo) and iron (dFe) were determined along an Atlantic Meridional Transect (AMT-19; Oct/Nov 2009) between 50°N and 40°S in the upper 150 m in order to investigate the behaviour and distribution of these two essential, bioactive TEs. During AMT-19, large differences in the distributions of dCo and dFe were observed. In the North Atlantic gyre provinces, extremely low mixed layer dCo concentrations (23 ± 9 pM) were observed, which contrasts with the relatively high mixed layer dFe concentrations (up to 1.0 nM) coincident with the band of highest atmospheric deposition (∼5–30°N). In the South Atlantic gyre, the opposite trend was observed, with relatively high dCo (55 ± 18 pM) observed throughout the water column, but low dFe concentrations (0.29 ± 0.08 nM). Given that annual dust supply is an order of magnitude greater in the North than the South Atlantic, the dCo distribution was somewhat unexpected. However, the distribution of dCo shows similarities with the distribution of phosphate (PO43−) in the euphotic zone of the Atlantic Ocean, where the North Atlantic gyre is characterised by chronically low PO4, and higher concentrations are observed in the South Atlantic gyre (Mather et al., 2008), suggesting the potential for a similar biological control of dCo distributions. Inverse correlations between dCo and Prochlorococcus abundance in the North Atlantic gyre provinces, combined with extremely low dCo where nitrogen fixation rates were highest (∼20–28°N), suggests the dominance of biological controls on dCo distributions. The contrasting dCo and dFe distributions in the North and South Atlantic gyres provides insights ... Article in Journal/Newspaper North Atlantic PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) Progress in Oceanography 158 52 64
institution Open Polar
collection PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University)
op_collection_id ftunivplympearl
language English
topic 37 Earth Sciences
3708 Oceanography
3701 Atmospheric Sciences
spellingShingle 37 Earth Sciences
3708 Oceanography
3701 Atmospheric Sciences
Shelley, RU
Wyatt, NJ
Tarran, GA
Rees, AP
Worsfold, PJ
Lohan, MC
A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)
topic_facet 37 Earth Sciences
3708 Oceanography
3701 Atmospheric Sciences
description Publisher policy: author can archive post-print on open access repository after an embargo period of 12 months. Cobalt (Co) and iron (Fe) are essential for phytoplankton nutrition, and as such constitute a vital link in the marine biological carbon pump. Atmospheric deposition is an important, and in some places the dominant, source of trace elements (TEs) to the global ocean. Dissolved cobalt (dCo) and iron (dFe) were determined along an Atlantic Meridional Transect (AMT-19; Oct/Nov 2009) between 50°N and 40°S in the upper 150 m in order to investigate the behaviour and distribution of these two essential, bioactive TEs. During AMT-19, large differences in the distributions of dCo and dFe were observed. In the North Atlantic gyre provinces, extremely low mixed layer dCo concentrations (23 ± 9 pM) were observed, which contrasts with the relatively high mixed layer dFe concentrations (up to 1.0 nM) coincident with the band of highest atmospheric deposition (∼5–30°N). In the South Atlantic gyre, the opposite trend was observed, with relatively high dCo (55 ± 18 pM) observed throughout the water column, but low dFe concentrations (0.29 ± 0.08 nM). Given that annual dust supply is an order of magnitude greater in the North than the South Atlantic, the dCo distribution was somewhat unexpected. However, the distribution of dCo shows similarities with the distribution of phosphate (PO43−) in the euphotic zone of the Atlantic Ocean, where the North Atlantic gyre is characterised by chronically low PO4, and higher concentrations are observed in the South Atlantic gyre (Mather et al., 2008), suggesting the potential for a similar biological control of dCo distributions. Inverse correlations between dCo and Prochlorococcus abundance in the North Atlantic gyre provinces, combined with extremely low dCo where nitrogen fixation rates were highest (∼20–28°N), suggests the dominance of biological controls on dCo distributions. The contrasting dCo and dFe distributions in the North and South Atlantic gyres provides insights ...
format Article in Journal/Newspaper
author Shelley, RU
Wyatt, NJ
Tarran, GA
Rees, AP
Worsfold, PJ
Lohan, MC
author_facet Shelley, RU
Wyatt, NJ
Tarran, GA
Rees, AP
Worsfold, PJ
Lohan, MC
author_sort Shelley, RU
title A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)
title_short A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)
title_full A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)
title_fullStr A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)
title_full_unstemmed A tale of two gyres: Contrasting distributions of dissolved cobalt and iron in the Atlantic Ocean during an Atlantic Meridional Transect (AMT-19)
title_sort tale of two gyres: contrasting distributions of dissolved cobalt and iron in the atlantic ocean during an atlantic meridional transect (amt-19)
publisher Elsevier BV
publishDate 2017
url http://hdl.handle.net/10026.1/9630
https://doi.org/10.1016/j.pocean.2016.10.013
genre North Atlantic
genre_facet North Atlantic
op_relation ISSN:0079-6611
0079-6611
http://hdl.handle.net/10026.1/9630
doi:10.1016/j.pocean.2016.10.013
op_rights 2017-11-27
Not known
op_doi https://doi.org/10.1016/j.pocean.2016.10.013
container_title Progress in Oceanography
container_volume 158
container_start_page 52
op_container_end_page 64
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