Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre
International audience In mid- and high-latitude oceans, winter surface cooling and strong winds drive turbulent mixing that carries phytoplankton to depths of several hundred metres, well below the sunlit layer. This downward mixing, in combination with low solar radiation, drastically limits phyto...
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Online Access: | https://hal.science/hal-03515671 https://hal.science/hal-03515671/document https://hal.science/hal-03515671/file/LACOUR_Main_Text_final_version.pdf https://doi.org/10.1038/ngeo3035 |
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ftccsdartic:oai:HAL:hal-03515671v1 2024-02-27T08:43:24+00:00 Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre Lacour, L. Ardyna, M. Stec, K., F Claustre, H. Prieur, L. Poteau, A. Ribera d'Alcala, M Iudicone, D. Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Stazione Zoologica Anton Dohrn (SZN) 2017 https://hal.science/hal-03515671 https://hal.science/hal-03515671/document https://hal.science/hal-03515671/file/LACOUR_Main_Text_final_version.pdf https://doi.org/10.1038/ngeo3035 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo3035 hal-03515671 https://hal.science/hal-03515671 https://hal.science/hal-03515671/document https://hal.science/hal-03515671/file/LACOUR_Main_Text_final_version.pdf doi:10.1038/ngeo3035 info:eu-repo/semantics/OpenAccess ISSN: 1752-0894 Nature Geoscience https://hal.science/hal-03515671 Nature Geoscience, 2017, 10 (11), pp.836-839. ⟨10.1038/ngeo3035⟩ [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2017 ftccsdartic https://doi.org/10.1038/ngeo3035 2024-01-28T01:33:37Z International audience In mid- and high-latitude oceans, winter surface cooling and strong winds drive turbulent mixing that carries phytoplankton to depths of several hundred metres, well below the sunlit layer. This downward mixing, in combination with low solar radiation, drastically limits phytoplankton growth during the winter, especially that of the diatoms and other species that are involved in seeding the spring bloom. Here we present observational evidence for widespread winter phytoplankton blooms in a large part of the North Atlantic subpolar gyre from autonomous profiling floats equipped with biogeochemical sensors. These blooms were triggered by intermittent restratification of the mixed layer when mixed-layer eddies led to a horizontal transport of lighter water over denser layers. Combining a bio-optical index with complementary chemotaxonomic and modelling approaches, we show that these restratification events increase phytoplankton residence time in the sunlight zone, resulting in greater light interception and the emergence of winter blooms. Restratification also caused a phytoplankton community shift from pico- and nanophytoplankton to phototrophic diatoms. We conclude that transient winter blooms can maintain active diatom populations throughout the winter months, directly seeding the spring bloom and potentially making a significant contribution to over-winter carbon export. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Nature Geoscience 10 11 836 839 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
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[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
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[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Lacour, L. Ardyna, M. Stec, K., F Claustre, H. Prieur, L. Poteau, A. Ribera d'Alcala, M Iudicone, D. Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience In mid- and high-latitude oceans, winter surface cooling and strong winds drive turbulent mixing that carries phytoplankton to depths of several hundred metres, well below the sunlit layer. This downward mixing, in combination with low solar radiation, drastically limits phytoplankton growth during the winter, especially that of the diatoms and other species that are involved in seeding the spring bloom. Here we present observational evidence for widespread winter phytoplankton blooms in a large part of the North Atlantic subpolar gyre from autonomous profiling floats equipped with biogeochemical sensors. These blooms were triggered by intermittent restratification of the mixed layer when mixed-layer eddies led to a horizontal transport of lighter water over denser layers. Combining a bio-optical index with complementary chemotaxonomic and modelling approaches, we show that these restratification events increase phytoplankton residence time in the sunlight zone, resulting in greater light interception and the emergence of winter blooms. Restratification also caused a phytoplankton community shift from pico- and nanophytoplankton to phototrophic diatoms. We conclude that transient winter blooms can maintain active diatom populations throughout the winter months, directly seeding the spring bloom and potentially making a significant contribution to over-winter carbon export. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Stazione Zoologica Anton Dohrn (SZN) |
format |
Article in Journal/Newspaper |
author |
Lacour, L. Ardyna, M. Stec, K., F Claustre, H. Prieur, L. Poteau, A. Ribera d'Alcala, M Iudicone, D. |
author_facet |
Lacour, L. Ardyna, M. Stec, K., F Claustre, H. Prieur, L. Poteau, A. Ribera d'Alcala, M Iudicone, D. |
author_sort |
Lacour, L. |
title |
Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre |
title_short |
Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre |
title_full |
Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre |
title_fullStr |
Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre |
title_full_unstemmed |
Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre |
title_sort |
unexpected winter phytoplankton blooms in the north atlantic subpolar gyre |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-03515671 https://hal.science/hal-03515671/document https://hal.science/hal-03515671/file/LACOUR_Main_Text_final_version.pdf https://doi.org/10.1038/ngeo3035 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1752-0894 Nature Geoscience https://hal.science/hal-03515671 Nature Geoscience, 2017, 10 (11), pp.836-839. ⟨10.1038/ngeo3035⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo3035 hal-03515671 https://hal.science/hal-03515671 https://hal.science/hal-03515671/document https://hal.science/hal-03515671/file/LACOUR_Main_Text_final_version.pdf doi:10.1038/ngeo3035 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/ngeo3035 |
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Nature Geoscience |
container_volume |
10 |
container_issue |
11 |
container_start_page |
836 |
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839 |
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1792051388507750400 |