Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms
Southern Ocean phytoplankton growth is limited by iron. Episodes of natural iron fertilisation are pivotal to triggering phytoplankton blooms in this region, the Kerguelen Plateau bloom being one prominent example. Numerous physical mechanisms that may supply iron to the euphotic zone in the Kerguel...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Online Access: | https://doi.org/10.1016/j.dsr.2016.06.009 http://ecite.utas.edu.au/114284 |
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ftunivtasecite:oai:ecite.utas.edu.au:114284 2023-05-15T18:25:02+02:00 Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms Rosso, I Hogg, AMcC Matear, R Strutton, PG 2016 https://doi.org/10.1016/j.dsr.2016.06.009 http://ecite.utas.edu.au/114284 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr.2016.06.009 http://purl.org/au-research/grants/arc/CE1101028 Rosso, I and Hogg, AMcC and Matear, R and Strutton, PG, Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms, Deep-Sea Research I, 115 pp. 199-209. ISSN 0967-0637 (2016) [Refereed Article] http://ecite.utas.edu.au/114284 Earth Sciences Oceanography Biological Oceanography Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1016/j.dsr.2016.06.009 2019-12-13T22:14:11Z Southern Ocean phytoplankton growth is limited by iron. Episodes of natural iron fertilisation are pivotal to triggering phytoplankton blooms in this region, the Kerguelen Plateau bloom being one prominent example. Numerous physical mechanisms that may supply iron to the euphotic zone in the Kerguelen Plateau region, and hence trigger a phytoplankton bloom, have been identified. However, the impact of sub-mesoscale flows in delivering iron has been omitted. With a scale of order 10km, sub-mesoscale filaments and fronts can dramatically increase vertical velocities and iron transport. An innovative technique is developed to investigate the role of vertical advection associated with sub-mesoscale features on the supply of iron to the photic zone. First, Lagrangian trajectories are calculated using three dimensional velocity fields from high resolution numerical simulations; iron concentration is then computed along these Lagrangian trajectories. The contribution of mesoscale- (1/20 resolution) and sub-mesoscale-resolving models (1/80 resolution) is compared, thereby revealing the sensitivity of iron supply to horizontal resolution. Iron fluxes are clearly enhanced by a factor of 2 with the resolution, thus showing that the vertical motion induced by the sub-mesoscales represents a previously neglected process to drive iron into the photic waters of the Kerguelen Plateau. Article in Journal/Newspaper Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Kerguelen Deep Sea Research Part I: Oceanographic Research Papers 115 199 209 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological Oceanography |
spellingShingle |
Earth Sciences Oceanography Biological Oceanography Rosso, I Hogg, AMcC Matear, R Strutton, PG Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms |
topic_facet |
Earth Sciences Oceanography Biological Oceanography |
description |
Southern Ocean phytoplankton growth is limited by iron. Episodes of natural iron fertilisation are pivotal to triggering phytoplankton blooms in this region, the Kerguelen Plateau bloom being one prominent example. Numerous physical mechanisms that may supply iron to the euphotic zone in the Kerguelen Plateau region, and hence trigger a phytoplankton bloom, have been identified. However, the impact of sub-mesoscale flows in delivering iron has been omitted. With a scale of order 10km, sub-mesoscale filaments and fronts can dramatically increase vertical velocities and iron transport. An innovative technique is developed to investigate the role of vertical advection associated with sub-mesoscale features on the supply of iron to the photic zone. First, Lagrangian trajectories are calculated using three dimensional velocity fields from high resolution numerical simulations; iron concentration is then computed along these Lagrangian trajectories. The contribution of mesoscale- (1/20 resolution) and sub-mesoscale-resolving models (1/80 resolution) is compared, thereby revealing the sensitivity of iron supply to horizontal resolution. Iron fluxes are clearly enhanced by a factor of 2 with the resolution, thus showing that the vertical motion induced by the sub-mesoscales represents a previously neglected process to drive iron into the photic waters of the Kerguelen Plateau. |
format |
Article in Journal/Newspaper |
author |
Rosso, I Hogg, AMcC Matear, R Strutton, PG |
author_facet |
Rosso, I Hogg, AMcC Matear, R Strutton, PG |
author_sort |
Rosso, I |
title |
Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms |
title_short |
Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms |
title_full |
Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms |
title_fullStr |
Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms |
title_full_unstemmed |
Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms |
title_sort |
quantifying the influence of sub-mesoscale dynamics on the supply of iron to southern ocean phytoplankton blooms |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.dsr.2016.06.009 http://ecite.utas.edu.au/114284 |
geographic |
Southern Ocean Kerguelen |
geographic_facet |
Southern Ocean Kerguelen |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://dx.doi.org/10.1016/j.dsr.2016.06.009 http://purl.org/au-research/grants/arc/CE1101028 Rosso, I and Hogg, AMcC and Matear, R and Strutton, PG, Quantifying the influence of sub-mesoscale dynamics on the supply of iron to Southern Ocean phytoplankton blooms, Deep-Sea Research I, 115 pp. 199-209. ISSN 0967-0637 (2016) [Refereed Article] http://ecite.utas.edu.au/114284 |
op_doi |
https://doi.org/10.1016/j.dsr.2016.06.009 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
115 |
container_start_page |
199 |
op_container_end_page |
209 |
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1766206174168875008 |