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 |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1016/j.marchem.2019.03.002 https://hal.archives-ouvertes.fr/hal-02869858 |
id |
fttriple:oai:gotriple.eu:10670/1.o9efi5 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
GEOTRACES process study GIpr05 Heard and McDonald islands ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals envir geo |
spellingShingle |
GEOTRACES process study GIpr05 Heard and McDonald islands ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals envir geo Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, 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 |
GEOTRACES process study GIpr05 Heard and McDonald islands ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals envir geo |
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 Horbat (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 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, Townsend, Ashley T. Schallenberg, Christina Tonnard, Manon Bowie, Andrew R. |
author_facet |
Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, 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://doi.org/10.1016/j.marchem.2019.03.002 https://hal.archives-ouvertes.fr/hal-02869858 |
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 |
Austral Heard Heard Island Heard Island Kerguelen McDonald Islands Southern Ocean |
geographic_facet |
Austral Heard Heard Island Heard Island Kerguelen McDonald Islands Southern Ocean |
genre |
Heard Island McDonald Islands Southern Ocean |
genre_facet |
Heard Island McDonald Islands Southern Ocean |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0304-4203 Marine Chemistry Marine Chemistry, Elsevier, 2019, 211, pp.1-14. ⟨10.1016/j.marchem.2019.03.002⟩ |
op_relation |
hal-02869858 doi:10.1016/j.marchem.2019.03.002 10670/1.o9efi5 https://hal.archives-ouvertes.fr/hal-02869858 |
op_rights |
undefined |
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_ |
1766023682761687040 |
spelling |
fttriple:oai:gotriple.eu:10670/1.o9efi5 2023-05-15T16:33:56+02:00 Iron availability influences nutrient drawdown in the Heard and McDonald Islands region, Southern Ocean Holmes, Thomas M. Wuttig, Kathrin Chase, Zanna Merwe, Pier, 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 Horbat (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 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) 2019-01-01 https://doi.org/10.1016/j.marchem.2019.03.002 https://hal.archives-ouvertes.fr/hal-02869858 en eng HAL CCSD Elsevier hal-02869858 doi:10.1016/j.marchem.2019.03.002 10670/1.o9efi5 https://hal.archives-ouvertes.fr/hal-02869858 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0304-4203 Marine Chemistry Marine Chemistry, Elsevier, 2019, 211, pp.1-14. ⟨10.1016/j.marchem.2019.03.002⟩ GEOTRACES process study GIpr05 Heard and McDonald islands ACL fertilization patterns carbon Iron diatoms limitation circulation dissolved iron phytoplankton bloom Biogeochemistry heobi kerguelen plateau nitrogen-fixation Nutrient drawdown Trace metals envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.1016/j.marchem.2019.03.002 2023-01-22T16:38:24Z 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 Unknown Austral Heard ENVELOPE(73.510,73.510,-53.117,-53.117) Heard Island Heard Island ENVELOPE(73.510,73.510,-53.117,-53.117) Kerguelen McDonald Islands ENVELOPE(72.600,72.600,-53.033,-53.033) Southern Ocean Marine Chemistry 211 1 14 |