Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean
WOS:000467669600001 International audience At the southern part of the northern Kerguelen Plateau (Southern Ocean) is an active volcanic hotspot, hosting volcanically active Heard Island and McDonald Islands (HIMI), the former of which is largely covered by glaciers. While offshore waters are persis...
Published in: | Marine Chemistry |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.science/hal-02869858 https://doi.org/10.1016/j.marchem.2019.03.002 |
id |
ftunivbrest:oai:HAL:hal-02869858v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry GEOTRACES process study GIpr05 Heard and McDonald islands heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry GEOTRACES process study GIpr05 Heard and McDonald islands heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, van Der Townsend, Ashley T. Schallenberg, Christina Tonnard, Manon Bowie, Andrew R. Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean |
topic_facet |
ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry GEOTRACES process study GIpr05 Heard and McDonald islands heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
WOS:000467669600001 International audience At the southern part of the northern Kerguelen Plateau (Southern Ocean) is an active volcanic hotspot, hosting volcanically active Heard Island and McDonald Islands (HIMI), the former of which is largely covered by glaciers. While offshore waters are persistently Fe limited, typical of the broader Southern Ocean, near shore waters over the Kerguelen plateau show variability in Fe distributions and support a high biomass of phytoplankton during austral spring-summer. This study investigates dissolved iron (DFe) and macronutrient distributions in waters surrounding HIMI during the Heard Earth-Ocean-Biosphere Interactions (HEOBI) voyage in January-February 2016. Comparison of surface DFe with macronutrient concentrations shows that the majority of the plateau is Fe limited in late summer and, based on comparison with previous voyages, also Fe limited in different years and earlier in the bloom season. The distribution of DFe drawdown from estimated winter inventories to observed late summer inventories shows that DFe availability drives macronutrient uptake on the plateau. The drawdown of silicic acid decreases relative to nitrate drawdown in proximity to HIMI, in agreement with classical diatom nutrient uptake behaviour under iron replete conditions. Comparison of Fe: nitrate and Fe: phosphate drawdown ratios with expected uptake stoichiometry suggest that recycling of Fe increases with distance from Fe sources on the plateau. Lastly, comparison with data from previous voyages shows that DFe distribution varies inter-annually due to complex oceanographic conditions on the plateau, with greatest variability observed over the rough bathymetry and strongly tidally influenced region closest to HIMI. Together these data highlight the central role of Fe in driving nutrient uptake and stoichiometry in the HIMI region of the Kerguelen Plateau. |
author2 |
Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, van Der Townsend, Ashley T. Schallenberg, Christina Tonnard, Manon Bowie, Andrew R. |
author_facet |
Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, van Der Townsend, Ashley T. Schallenberg, Christina Tonnard, Manon Bowie, Andrew R. |
author_sort |
Holmes, Thomas M. |
title |
Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean |
title_short |
Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean |
title_full |
Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean |
title_fullStr |
Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean |
title_full_unstemmed |
Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean |
title_sort |
iron availability influences nutrient drawdown in the heard and mcdonald islands region, southern ocean |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02869858 https://doi.org/10.1016/j.marchem.2019.03.002 |
long_lat |
ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(72.600,72.600,-53.033,-53.033) |
geographic |
Southern Ocean Austral Kerguelen Heard Island Heard Island Heard McDonald Islands |
geographic_facet |
Southern Ocean Austral Kerguelen Heard Island Heard Island Heard McDonald Islands |
genre |
Heard Island McDonald Islands Southern Ocean |
genre_facet |
Heard Island McDonald Islands Southern Ocean |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-02869858 Marine Chemistry, 2019, 211, pp.1-14. ⟨10.1016/j.marchem.2019.03.002⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2019.03.002 hal-02869858 https://hal.science/hal-02869858 doi:10.1016/j.marchem.2019.03.002 |
op_doi |
https://doi.org/10.1016/j.marchem.2019.03.002 |
container_title |
Marine Chemistry |
container_volume |
211 |
container_start_page |
1 |
op_container_end_page |
14 |
_version_ |
1790601226808721408 |
spelling |
ftunivbrest:oai:HAL:hal-02869858v1 2024-02-11T10:04:34+01:00 Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, van Der Townsend, Ashley T. Schallenberg, Christina Tonnard, Manon Bowie, Andrew R. Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2019 https://hal.science/hal-02869858 https://doi.org/10.1016/j.marchem.2019.03.002 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2019.03.002 hal-02869858 https://hal.science/hal-02869858 doi:10.1016/j.marchem.2019.03.002 ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-02869858 Marine Chemistry, 2019, 211, pp.1-14. ⟨10.1016/j.marchem.2019.03.002⟩ ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry GEOTRACES process study GIpr05 Heard and McDonald islands heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2019 ftunivbrest https://doi.org/10.1016/j.marchem.2019.03.002 2024-01-23T23:39:46Z WOS:000467669600001 International audience At the southern part of the northern Kerguelen Plateau (Southern Ocean) is an active volcanic hotspot, hosting volcanically active Heard Island and McDonald Islands (HIMI), the former of which is largely covered by glaciers. While offshore waters are persistently Fe limited, typical of the broader Southern Ocean, near shore waters over the Kerguelen plateau show variability in Fe distributions and support a high biomass of phytoplankton during austral spring-summer. This study investigates dissolved iron (DFe) and macronutrient distributions in waters surrounding HIMI during the Heard Earth-Ocean-Biosphere Interactions (HEOBI) voyage in January-February 2016. Comparison of surface DFe with macronutrient concentrations shows that the majority of the plateau is Fe limited in late summer and, based on comparison with previous voyages, also Fe limited in different years and earlier in the bloom season. The distribution of DFe drawdown from estimated winter inventories to observed late summer inventories shows that DFe availability drives macronutrient uptake on the plateau. The drawdown of silicic acid decreases relative to nitrate drawdown in proximity to HIMI, in agreement with classical diatom nutrient uptake behaviour under iron replete conditions. Comparison of Fe: nitrate and Fe: phosphate drawdown ratios with expected uptake stoichiometry suggest that recycling of Fe increases with distance from Fe sources on the plateau. Lastly, comparison with data from previous voyages shows that DFe distribution varies inter-annually due to complex oceanographic conditions on the plateau, with greatest variability observed over the rough bathymetry and strongly tidally influenced region closest to HIMI. Together these data highlight the central role of Fe in driving nutrient uptake and stoichiometry in the HIMI region of the Kerguelen Plateau. Article in Journal/Newspaper Heard Island McDonald Islands Southern Ocean Université de Bretagne Occidentale: HAL Southern Ocean Austral Kerguelen Heard Island Heard Island ENVELOPE(73.510,73.510,-53.117,-53.117) Heard ENVELOPE(73.510,73.510,-53.117,-53.117) McDonald Islands ENVELOPE(72.600,72.600,-53.033,-53.033) Marine Chemistry 211 1 14 |