Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region
The seasonal availability of light and micronutrients strongly regulates productivity in the Southern Ocean, restricting biological utilization of macronutrients and CO 2 drawdown. Mineral dust flux is a key conduit for micronutrients to the Southern Ocean and a critical mediator of multimillennial-...
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Language: | English |
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ftsouthampton:oai:eprints.soton.ac.uk:481390 2023-12-03T10:13:52+01:00 Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region Wyatt, Neil J. Birchill, Antony Ussher, Simon Milne, Angela Bouman, Heather A. Shoenfelt Troein, Elizabeth Pabortsava, Katsiaryna Wright, Alan Flanagan, Oliver Bibby, Thomas S. Martin, Adrian Moore, C. Mark 2023-07-03 https://eprints.soton.ac.uk/481390/ English eng Wyatt, Neil J., Birchill, Antony, Ussher, Simon, Milne, Angela, Bouman, Heather A., Shoenfelt Troein, Elizabeth, Pabortsava, Katsiaryna, Wright, Alan, Flanagan, Oliver, Bibby, Thomas S., Martin, Adrian and Moore, C. Mark (2023) Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region. Proceedings of the National Academy of Sciences, 120 (28), [e2220111120]. (doi:10.1073/pnas.2220111120 <http://dx.doi.org/10.1073/pnas.2220111120>). Article PeerReviewed 2023 ftsouthampton https://doi.org/10.1073/pnas.2220111120 2023-11-03T00:09:38Z The seasonal availability of light and micronutrients strongly regulates productivity in the Southern Ocean, restricting biological utilization of macronutrients and CO 2 drawdown. Mineral dust flux is a key conduit for micronutrients to the Southern Ocean and a critical mediator of multimillennial-scale atmospheric CO 2 oscillations. While the role of dust-borne iron (Fe) in Southern Ocean biogeochemistry has been examined in detail, manganese (Mn) availability is also emerging as a potential driver of past, present, and future Southern Ocean biogeochemistry. Here, we present results from fifteen bioassay experiments along a north–south transect in the undersampled eastern Pacific sub-Antarctic zone. In addition to widespread Fe limitation of phytoplankton photochemical efficiency, we found further responses following the addition of Mn at our southerly stations, supporting the importance of Fe–Mn co-limitation in the Southern Ocean. Moreover, addition of different Patagonian dusts resulted in enhanced photochemical efficiency with differential responses linked to source region dust characteristics in terms of relative Fe/Mn solubility. Changes in the relative magnitude of dust deposition, combined with source region mineralogy, could hence determine whether Fe or Mn limitation control Southern Ocean productivity under future as well as past climate states. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of Southampton: e-Prints Soton Antarctic Southern Ocean Pacific Proceedings of the National Academy of Sciences 120 28 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
The seasonal availability of light and micronutrients strongly regulates productivity in the Southern Ocean, restricting biological utilization of macronutrients and CO 2 drawdown. Mineral dust flux is a key conduit for micronutrients to the Southern Ocean and a critical mediator of multimillennial-scale atmospheric CO 2 oscillations. While the role of dust-borne iron (Fe) in Southern Ocean biogeochemistry has been examined in detail, manganese (Mn) availability is also emerging as a potential driver of past, present, and future Southern Ocean biogeochemistry. Here, we present results from fifteen bioassay experiments along a north–south transect in the undersampled eastern Pacific sub-Antarctic zone. In addition to widespread Fe limitation of phytoplankton photochemical efficiency, we found further responses following the addition of Mn at our southerly stations, supporting the importance of Fe–Mn co-limitation in the Southern Ocean. Moreover, addition of different Patagonian dusts resulted in enhanced photochemical efficiency with differential responses linked to source region dust characteristics in terms of relative Fe/Mn solubility. Changes in the relative magnitude of dust deposition, combined with source region mineralogy, could hence determine whether Fe or Mn limitation control Southern Ocean productivity under future as well as past climate states. |
format |
Article in Journal/Newspaper |
author |
Wyatt, Neil J. Birchill, Antony Ussher, Simon Milne, Angela Bouman, Heather A. Shoenfelt Troein, Elizabeth Pabortsava, Katsiaryna Wright, Alan Flanagan, Oliver Bibby, Thomas S. Martin, Adrian Moore, C. Mark |
spellingShingle |
Wyatt, Neil J. Birchill, Antony Ussher, Simon Milne, Angela Bouman, Heather A. Shoenfelt Troein, Elizabeth Pabortsava, Katsiaryna Wright, Alan Flanagan, Oliver Bibby, Thomas S. Martin, Adrian Moore, C. Mark Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region |
author_facet |
Wyatt, Neil J. Birchill, Antony Ussher, Simon Milne, Angela Bouman, Heather A. Shoenfelt Troein, Elizabeth Pabortsava, Katsiaryna Wright, Alan Flanagan, Oliver Bibby, Thomas S. Martin, Adrian Moore, C. Mark |
author_sort |
Wyatt, Neil J. |
title |
Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region |
title_short |
Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region |
title_full |
Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region |
title_fullStr |
Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region |
title_full_unstemmed |
Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region |
title_sort |
phytoplankton responses to dust addition in the fe–mn co-limited eastern pacific sub-antarctic differ by source region |
publishDate |
2023 |
url |
https://eprints.soton.ac.uk/481390/ |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
Wyatt, Neil J., Birchill, Antony, Ussher, Simon, Milne, Angela, Bouman, Heather A., Shoenfelt Troein, Elizabeth, Pabortsava, Katsiaryna, Wright, Alan, Flanagan, Oliver, Bibby, Thomas S., Martin, Adrian and Moore, C. Mark (2023) Phytoplankton responses to dust addition in the Fe–Mn co-limited eastern Pacific sub-Antarctic differ by source region. Proceedings of the National Academy of Sciences, 120 (28), [e2220111120]. (doi:10.1073/pnas.2220111120 <http://dx.doi.org/10.1073/pnas.2220111120>). |
op_doi |
https://doi.org/10.1073/pnas.2220111120 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
120 |
container_issue |
28 |
_version_ |
1784260827038089216 |