Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom
Abstract Biological productivity in the Southern Ocean is modulated by iron availability. Every summer, a large phytoplankton bloom forms northwest of the Ross Sea, above the Antarctic Australian Ridge (AAR), due to a plume of iron‐rich waters. Here, we investigate the origin and trajectories of the...
Published in: | Geophysical Research Letters |
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ftdoajarticles:oai:doaj.org/article:ac3633c42edc4e57b95aae4011a16d86 2024-09-15T17:48:09+00:00 Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom A. Vanegas Ledesma L. N. Thomas 2024-07-01T00:00:00Z https://doi.org/10.1029/2023GL108001 https://doaj.org/article/ac3633c42edc4e57b95aae4011a16d86 EN eng Wiley https://doi.org/10.1029/2023GL108001 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL108001 https://doaj.org/article/ac3633c42edc4e57b95aae4011a16d86 Geophysical Research Letters, Vol 51, Iss 14, Pp n/a-n/a (2024) Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2023GL108001 2024-08-05T17:48:48Z Abstract Biological productivity in the Southern Ocean is modulated by iron availability. Every summer, a large phytoplankton bloom forms northwest of the Ross Sea, above the Antarctic Australian Ridge (AAR), due to a plume of iron‐rich waters. Here, we investigate the origin and trajectories of these iron‐rich waters by analyzing water mass observations and Lagrangian experiments. Output from the Southern Ocean State Estimate (SOSE) and in situ measurements reveal that iron‐rich AAR bloom waters share properties with Modified Circumpolar Deep Water (MCDW), which forms on the Antarctic shelf‐slope. The Lagrangian experiments are conducted using SOSE velocities. Bloom waters tracked with virtual Lagrangian particles highlight an along isopycnal pathway of MCDW from Antarctica's shelf‐slope to the AAR bloom site, illustrating advection of these waters by the Balleny Gyre. These results are supported by temperature‐salinity analyses, which show a correlation between waters advected northwards; MCDW properties; and high iron concentrations. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Southern Ocean Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 14 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Geophysics. Cosmic physics QC801-809 A. Vanegas Ledesma L. N. Thomas Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom |
topic_facet |
Geophysics. Cosmic physics QC801-809 |
description |
Abstract Biological productivity in the Southern Ocean is modulated by iron availability. Every summer, a large phytoplankton bloom forms northwest of the Ross Sea, above the Antarctic Australian Ridge (AAR), due to a plume of iron‐rich waters. Here, we investigate the origin and trajectories of these iron‐rich waters by analyzing water mass observations and Lagrangian experiments. Output from the Southern Ocean State Estimate (SOSE) and in situ measurements reveal that iron‐rich AAR bloom waters share properties with Modified Circumpolar Deep Water (MCDW), which forms on the Antarctic shelf‐slope. The Lagrangian experiments are conducted using SOSE velocities. Bloom waters tracked with virtual Lagrangian particles highlight an along isopycnal pathway of MCDW from Antarctica's shelf‐slope to the AAR bloom site, illustrating advection of these waters by the Balleny Gyre. These results are supported by temperature‐salinity analyses, which show a correlation between waters advected northwards; MCDW properties; and high iron concentrations. |
format |
Article in Journal/Newspaper |
author |
A. Vanegas Ledesma L. N. Thomas |
author_facet |
A. Vanegas Ledesma L. N. Thomas |
author_sort |
A. Vanegas Ledesma |
title |
Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom |
title_short |
Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom |
title_full |
Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom |
title_fullStr |
Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom |
title_full_unstemmed |
Transport Pathways for Iron Supply to the Australian Antarctic Ridge Phytoplankton Bloom |
title_sort |
transport pathways for iron supply to the australian antarctic ridge phytoplankton bloom |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2023GL108001 https://doaj.org/article/ac3633c42edc4e57b95aae4011a16d86 |
genre |
Antarc* Antarctic Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Ross Sea Southern Ocean |
op_source |
Geophysical Research Letters, Vol 51, Iss 14, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2023GL108001 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL108001 https://doaj.org/article/ac3633c42edc4e57b95aae4011a16d86 |
op_doi |
https://doi.org/10.1029/2023GL108001 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
14 |
_version_ |
1810289302535405568 |