Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence
Frontal systems in the Southern Ocean are known for their enhanced biological activity, with some tantalising suggestions that this enhancement may be intermittent. We have used frequent satellite ocean colour observations to investigate the Subtropical Convergence south of Africa. We demonstrate th...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.science/hal-00282583 https://hal.science/hal-00282583/document https://hal.science/hal-00282583/file/2005GL022880.pdf https://doi.org/10.1029/2005GL022880 |
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ftunivnantes:oai:HAL:hal-00282583v1 2023-05-15T18:25:22+02:00 Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence Llido, J. Garçon, V. Lutjeharms, J. R.E. Sudre, J. Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) 2005 https://hal.science/hal-00282583 https://hal.science/hal-00282583/document https://hal.science/hal-00282583/file/2005GL022880.pdf https://doi.org/10.1029/2005GL022880 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2005GL022880 hal-00282583 https://hal.science/hal-00282583 https://hal.science/hal-00282583/document https://hal.science/hal-00282583/file/2005GL022880.pdf doi:10.1029/2005GL022880 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00282583 Geophysical Research Letters, 2005, pp.32-L15611. ⟨10.1029/2005GL022880⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2005 ftunivnantes https://doi.org/10.1029/2005GL022880 2023-02-22T03:56:37Z Frontal systems in the Southern Ocean are known for their enhanced biological activity, with some tantalising suggestions that this enhancement may be intermittent. We have used frequent satellite ocean colour observations to investigate the Subtropical Convergence south of Africa. We demonstrate that the biological enhancement takes place as episodic chlorophyll bloom events with limited spatial and temporal scales. Most of the events appear in austral spring-summer. Two typical lifetimes, 8-24 and 40-60 days, emerge unambiguously during these seasons. A similar analysis has been carried out on modelled chlorophyll fields to investigate the physical-biogeochemical causes for such events. Strong and swift stratification, alleviating the light limitation on growth of phytoplankton, causes the appearance of a bloom. A mixed layer depth expansion subsequently leads to a rapid disappearance of the simulated event. Phytoplankton horizontal transport, either zonal or meridional, also plays a key role on the lifetime of the bloom events. Article in Journal/Newspaper Southern Ocean Université de Nantes: HAL-UNIV-NANTES Southern Ocean Austral Geophysical Research Letters 32 15 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Llido, J. Garçon, V. Lutjeharms, J. R.E. Sudre, J. Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
Frontal systems in the Southern Ocean are known for their enhanced biological activity, with some tantalising suggestions that this enhancement may be intermittent. We have used frequent satellite ocean colour observations to investigate the Subtropical Convergence south of Africa. We demonstrate that the biological enhancement takes place as episodic chlorophyll bloom events with limited spatial and temporal scales. Most of the events appear in austral spring-summer. Two typical lifetimes, 8-24 and 40-60 days, emerge unambiguously during these seasons. A similar analysis has been carried out on modelled chlorophyll fields to investigate the physical-biogeochemical causes for such events. Strong and swift stratification, alleviating the light limitation on growth of phytoplankton, causes the appearance of a bloom. A mixed layer depth expansion subsequently leads to a rapid disappearance of the simulated event. Phytoplankton horizontal transport, either zonal or meridional, also plays a key role on the lifetime of the bloom events. |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Llido, J. Garçon, V. Lutjeharms, J. R.E. Sudre, J. |
author_facet |
Llido, J. Garçon, V. Lutjeharms, J. R.E. Sudre, J. |
author_sort |
Llido, J. |
title |
Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence |
title_short |
Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence |
title_full |
Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence |
title_fullStr |
Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence |
title_full_unstemmed |
Event-scale blooms drive enhanced primary productivity at the Subtropical Convergence |
title_sort |
event-scale blooms drive enhanced primary productivity at the subtropical convergence |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00282583 https://hal.science/hal-00282583/document https://hal.science/hal-00282583/file/2005GL022880.pdf https://doi.org/10.1029/2005GL022880 |
geographic |
Southern Ocean Austral |
geographic_facet |
Southern Ocean Austral |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00282583 Geophysical Research Letters, 2005, pp.32-L15611. ⟨10.1029/2005GL022880⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2005GL022880 hal-00282583 https://hal.science/hal-00282583 https://hal.science/hal-00282583/document https://hal.science/hal-00282583/file/2005GL022880.pdf doi:10.1029/2005GL022880 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2005GL022880 |
container_title |
Geophysical Research Letters |
container_volume |
32 |
container_issue |
15 |
_version_ |
1766206797890191360 |