Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model
International audience Under present climatic conditions, primary production in the Southern Ocean is limited by a combination of grazing pressure, the light/mixing regime, and iron. The response of the ecosystem to a permanent increase of iron supply and/or changes in the mixing regime is analyzed...
Published in: | Global Biogeochemical Cycles |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.univ-brest.fr/hal-00472059 https://hal.univ-brest.fr/hal-00472059/document https://hal.univ-brest.fr/hal-00472059/file/2007GB002972.pdf https://doi.org/10.1029/2007GB002972 |
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ftccsdartic:oai:HAL:hal-00472059v1 2023-05-15T18:24:59+02:00 Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model Mongin, Mathieu Nelson, David, Pondaven, Philippe Tréguer, Paul Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) College of Oceanography Oregon State University (OSU) 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) 2007-12-22 https://hal.univ-brest.fr/hal-00472059 https://hal.univ-brest.fr/hal-00472059/document https://hal.univ-brest.fr/hal-00472059/file/2007GB002972.pdf https://doi.org/10.1029/2007GB002972 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GB002972 hal-00472059 https://hal.univ-brest.fr/hal-00472059 https://hal.univ-brest.fr/hal-00472059/document https://hal.univ-brest.fr/hal-00472059/file/2007GB002972.pdf doi:10.1029/2007GB002972 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.univ-brest.fr/hal-00472059 Global Biogeochemical Cycles, American Geophysical Union, 2007, 21 (4), pp.GB4020. ⟨10.1029/2007GB002972⟩ PRIMARY PRODUCTIVITY EXPORT PRODUCTION ECOSYSTEM MODEL PACIFIC SECTOR SI LIGHT BIOGEOCHEMISTRY FERTILIZATION GROWTH BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2007 ftccsdartic https://doi.org/10.1029/2007GB002972 2021-12-18T23:43:23Z International audience Under present climatic conditions, primary production in the Southern Ocean is limited by a combination of grazing pressure, the light/mixing regime, and iron. The response of the ecosystem to a permanent increase of iron supply and/or changes in the mixing regime is analyzed with a flexible-composition phytoplankton model that includes C, N, Si, and Fe cycling. Limitation of phytoplankton growth by light and nutrients ( Si, N, and Fe) is treated through their effects on cellular elemental composition. The model is applied to the KERFIX time series in the subantarctic region. Two physical scenarios are considered, normal and reduced mixed layer depth, with four different aeolian inputs of Fe in each case ranging from 1 to 1000 times the estimated present input. These simulations suggest that Fe supply via dust and rain must be increased by more than a factor of 10 to produce significant changes. Increased Fe supply alone causes the bloom to occur later in the season ( summer rather than spring), and coupled with a decrease in the mixed layer depth it produces drastic changes in the bloom intensity while preserving its present temporal development. Seasonal interaction between light and Fe limitation plays a critical role in controlling the primary and export production. If aeolian Fe input is increased by a factor of 1000, and mixed layer depth is reduced at the same time, export of carbon increases by a factor of 3. Light limitation prevents complete drawdown of nitrate, even if Fe limitation is removed and mixed layer depth reduced. This sets an upper limit on the primary production that can be achieved under the present meteorological conditions in this sector of the Southern Ocean. Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Pacific Southern Ocean Global Biogeochemical Cycles 21 4 n/a n/a |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
PRIMARY PRODUCTIVITY EXPORT PRODUCTION ECOSYSTEM MODEL PACIFIC SECTOR SI LIGHT BIOGEOCHEMISTRY FERTILIZATION GROWTH BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
PRIMARY PRODUCTIVITY EXPORT PRODUCTION ECOSYSTEM MODEL PACIFIC SECTOR SI LIGHT BIOGEOCHEMISTRY FERTILIZATION GROWTH BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Mongin, Mathieu Nelson, David, Pondaven, Philippe Tréguer, Paul Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model |
topic_facet |
PRIMARY PRODUCTIVITY EXPORT PRODUCTION ECOSYSTEM MODEL PACIFIC SECTOR SI LIGHT BIOGEOCHEMISTRY FERTILIZATION GROWTH BLOOM [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Under present climatic conditions, primary production in the Southern Ocean is limited by a combination of grazing pressure, the light/mixing regime, and iron. The response of the ecosystem to a permanent increase of iron supply and/or changes in the mixing regime is analyzed with a flexible-composition phytoplankton model that includes C, N, Si, and Fe cycling. Limitation of phytoplankton growth by light and nutrients ( Si, N, and Fe) is treated through their effects on cellular elemental composition. The model is applied to the KERFIX time series in the subantarctic region. Two physical scenarios are considered, normal and reduced mixed layer depth, with four different aeolian inputs of Fe in each case ranging from 1 to 1000 times the estimated present input. These simulations suggest that Fe supply via dust and rain must be increased by more than a factor of 10 to produce significant changes. Increased Fe supply alone causes the bloom to occur later in the season ( summer rather than spring), and coupled with a decrease in the mixed layer depth it produces drastic changes in the bloom intensity while preserving its present temporal development. Seasonal interaction between light and Fe limitation plays a critical role in controlling the primary and export production. If aeolian Fe input is increased by a factor of 1000, and mixed layer depth is reduced at the same time, export of carbon increases by a factor of 3. Light limitation prevents complete drawdown of nitrate, even if Fe limitation is removed and mixed layer depth reduced. This sets an upper limit on the primary production that can be achieved under the present meteorological conditions in this sector of the Southern Ocean. |
author2 |
Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) College of Oceanography Oregon State University (OSU) 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 |
Mongin, Mathieu Nelson, David, Pondaven, Philippe Tréguer, Paul |
author_facet |
Mongin, Mathieu Nelson, David, Pondaven, Philippe Tréguer, Paul |
author_sort |
Mongin, Mathieu |
title |
Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model |
title_short |
Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model |
title_full |
Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model |
title_fullStr |
Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model |
title_full_unstemmed |
Potential phytoplankton responses to iron and stratification changes in the Southern Ocean based on a flexible-composition phytoplankton model |
title_sort |
potential phytoplankton responses to iron and stratification changes in the southern ocean based on a flexible-composition phytoplankton model |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.univ-brest.fr/hal-00472059 https://hal.univ-brest.fr/hal-00472059/document https://hal.univ-brest.fr/hal-00472059/file/2007GB002972.pdf https://doi.org/10.1029/2007GB002972 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.univ-brest.fr/hal-00472059 Global Biogeochemical Cycles, American Geophysical Union, 2007, 21 (4), pp.GB4020. ⟨10.1029/2007GB002972⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GB002972 hal-00472059 https://hal.univ-brest.fr/hal-00472059 https://hal.univ-brest.fr/hal-00472059/document https://hal.univ-brest.fr/hal-00472059/file/2007GB002972.pdf doi:10.1029/2007GB002972 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007GB002972 |
container_title |
Global Biogeochemical Cycles |
container_volume |
21 |
container_issue |
4 |
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1766206066851315712 |