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 phytop...
Published in: | Nature Geoscience |
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Online Access: | https://hal.sorbonne-universite.fr/hal-01637037 https://doi.org/10.1038/ngeo3035 |
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ftinsu:oai:HAL:hal-01637037v1 2023-05-15T17:30:34+02:00 Unexpected winter phytoplankton blooms in the North Atlantic subpolar gyre Lacour, L. Ardyna, M. Stec, K. F., Claustre, Hervé 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) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) 2017-10-02 https://hal.sorbonne-universite.fr/hal-01637037 https://doi.org/10.1038/ngeo3035 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo3035 hal-01637037 https://hal.sorbonne-universite.fr/hal-01637037 doi:10.1038/ngeo3035 http://creativecommons.org/licenses/by/ ISSN: 1752-0894 Nature Geoscience https://hal.sorbonne-universite.fr/hal-01637037 Nature Geoscience, 2017, 10 (11), pp.836 - 839. ⟨10.1038/ngeo3035⟩ [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1038/ngeo3035 2022-12-07T17:30:19Z 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 Institut national des sciences de l'Univers: HAL-INSU Nature Geoscience 10 11 836 839 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Lacour, L. Ardyna, M. Stec, K. F., Claustre, Hervé 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.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) |
format |
Article in Journal/Newspaper |
author |
Lacour, L. Ardyna, M. Stec, K. F., Claustre, Hervé Prieur, L. Poteau, A. Ribera D 'Alcala, M Iudicone, D. |
author_facet |
Lacour, L. Ardyna, M. Stec, K. F., Claustre, Hervé 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.sorbonne-universite.fr/hal-01637037 https://doi.org/10.1038/ngeo3035 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1752-0894 Nature Geoscience https://hal.sorbonne-universite.fr/hal-01637037 Nature Geoscience, 2017, 10 (11), pp.836 - 839. ⟨10.1038/ngeo3035⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo3035 hal-01637037 https://hal.sorbonne-universite.fr/hal-01637037 doi:10.1038/ngeo3035 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1038/ngeo3035 |
container_title |
Nature Geoscience |
container_volume |
10 |
container_issue |
11 |
container_start_page |
836 |
op_container_end_page |
839 |
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1766127417629343744 |