Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean
Although iron and light are understood to regulate the Southern Ocean biological carbon pump, observations have also indicated a possible role for manganese. Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constraine...
Published in: | Global Biogeochemical Cycles |
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American Geophysical Union (AGU)
2022
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Online Access: | http://livrepository.liverpool.ac.uk/3169181/ https://doi.org/10.1029/2022gb007382 |
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:3169181 2023-05-15T13:43:31+02:00 Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean Hawco, Nicholas J Tagliabue, Alessandro Twining, Benjamin S 2022-10-25 http://livrepository.liverpool.ac.uk/3169181/ https://doi.org/10.1029/2022gb007382 en eng American Geophysical Union (AGU) Hawco, Nicholas J, Tagliabue, Alessandro orcid:0000-0002-3572-3634 and Twining, Benjamin S (2022) Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean. GLOBAL BIOGEOCHEMICAL CYCLES, 36 (11). Article NonPeerReviewed 2022 ftunivliverpool https://doi.org/10.1029/2022gb007382 2023-03-23T23:27:23Z Although iron and light are understood to regulate the Southern Ocean biological carbon pump, observations have also indicated a possible role for manganese. Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constrained and direct manganese limitation of the marine carbon cycle has been neglected by ocean models. Here, using available observations, we develop a new global biogeochemical model and find that phytoplankton in over half of the Southern Ocean cannot attain maximal growth rates because of manganese deficiency. Manganese limitation is most extensive in austral spring and depends on phytoplankton traits related to the size of photosynthetic antennae and the inhibition of manganese uptake by high zinc concentrations in Antarctic waters. Importantly, manganese limitation expands under the increased iron supply of past glacial periods, reducing the response of the biological carbon pump. Overall, these model experiments describe a mosaic of controls on Southern Ocean productivity that emerge from the interplay of light, iron, manganese and zinc, shaping the evolution of Antarctic phytoplankton since the opening of the Drake Passage. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean The University of Liverpool Repository Antarctic Austral Drake Passage Southern Ocean Global Biogeochemical Cycles 36 11 |
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Open Polar |
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The University of Liverpool Repository |
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ftunivliverpool |
language |
English |
description |
Although iron and light are understood to regulate the Southern Ocean biological carbon pump, observations have also indicated a possible role for manganese. Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constrained and direct manganese limitation of the marine carbon cycle has been neglected by ocean models. Here, using available observations, we develop a new global biogeochemical model and find that phytoplankton in over half of the Southern Ocean cannot attain maximal growth rates because of manganese deficiency. Manganese limitation is most extensive in austral spring and depends on phytoplankton traits related to the size of photosynthetic antennae and the inhibition of manganese uptake by high zinc concentrations in Antarctic waters. Importantly, manganese limitation expands under the increased iron supply of past glacial periods, reducing the response of the biological carbon pump. Overall, these model experiments describe a mosaic of controls on Southern Ocean productivity that emerge from the interplay of light, iron, manganese and zinc, shaping the evolution of Antarctic phytoplankton since the opening of the Drake Passage. |
format |
Article in Journal/Newspaper |
author |
Hawco, Nicholas J Tagliabue, Alessandro Twining, Benjamin S |
spellingShingle |
Hawco, Nicholas J Tagliabue, Alessandro Twining, Benjamin S Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
author_facet |
Hawco, Nicholas J Tagliabue, Alessandro Twining, Benjamin S |
author_sort |
Hawco, Nicholas J |
title |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_short |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_full |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_fullStr |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_full_unstemmed |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_sort |
manganese limitation of phytoplankton physiology and productivity in the southern ocean |
publisher |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
http://livrepository.liverpool.ac.uk/3169181/ https://doi.org/10.1029/2022gb007382 |
geographic |
Antarctic Austral Drake Passage Southern Ocean |
geographic_facet |
Antarctic Austral Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
Hawco, Nicholas J, Tagliabue, Alessandro orcid:0000-0002-3572-3634 and Twining, Benjamin S (2022) Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean. GLOBAL BIOGEOCHEMICAL CYCLES, 36 (11). |
op_doi |
https://doi.org/10.1029/2022gb007382 |
container_title |
Global Biogeochemical Cycles |
container_volume |
36 |
container_issue |
11 |
_version_ |
1766189875991674880 |