Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean
International audience The variability (in space and time) of westward propagating Rossby waves is analyzed with a wavelet method between 10N and 40N in the North Atlantic Ocean using two remotely sensed data sets (Sea Level Anomalies - SLA and surface chlorophyll-a concentrations) in order to bette...
Published in: | Journal of Marine Research |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2005
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Online Access: | https://hal.archives-ouvertes.fr/hal-00280349 https://doi.org/10.1357/002224006776412340 |
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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 |
description |
International audience The variability (in space and time) of westward propagating Rossby waves is analyzed with a wavelet method between 10N and 40N in the North Atlantic Ocean using two remotely sensed data sets (Sea Level Anomalies - SLA and surface chlorophyll-a concentrations) in order to better understand the waves' characteristics and their impacts on the chlorophyll distribution. Signals with wavelengths between ∼ 500 km and ∼ 1000 km with ∼ 4- to ∼ 24-month periods were detected and identified as the first baroclinic mode of Rossby waves. The spatial and temporal information has also highlighted a particular situation in 1998 at 34N, with the simultaneous existence of two distinct wave components corresponding to wavelengths 500 km and 1000 km. Signatures of the waves in ocean color prompt the question of how Rossby waves influence surface chlorophyll concentrations. Several physical/biological processes have been suggested: the eddy pumping mechanism associated with nutrient injection, the uplifting of a deep chlorophyll maximum toward the surface, and the meridional advection of horizontal chlorophyll gradients by geostrophic currents associated with baroclinic Rossby waves. A statistical decomposition of the observed signal into the different processes modeled by Killworth et al. (2004) confirms a main contribution of the north-south advection of the surface chlorophyll-a gradients south of 28N. In this part of the basin, more than ∼ 70% of the signal is explained by this horizontal process. North of 28N, Rossby wave signatures seem to be due to the horizontal advection as well as the vertical nutrient injection (∼ 50% of the observed amplitude). This vertical mechanism may have an impact on the primary production in this part of the basin. |
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) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) DYNBIO LEGOS Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Echanges Côte-Large (ECOLA) |
format |
Article in Journal/Newspaper |
author |
Charria, G. Dadou, I. Cipollini, P. Drévillon, M. De Mey, P. Garçon, V. |
spellingShingle |
Charria, G. Dadou, I. Cipollini, P. Drévillon, M. De Mey, P. Garçon, V. Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean |
author_facet |
Charria, G. Dadou, I. Cipollini, P. Drévillon, M. De Mey, P. Garçon, V. |
author_sort |
Charria, G. |
title |
Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean |
title_short |
Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean |
title_full |
Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean |
title_fullStr |
Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean |
title_full_unstemmed |
Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean |
title_sort |
understanding the influence of rossby waves on surface chlorophyll concentrations in the north atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00280349 https://doi.org/10.1357/002224006776412340 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0022-2402 EISSN: 1543-9542 Journal of marine research https://hal.archives-ouvertes.fr/hal-00280349 Journal of marine research, Yale University, 2005, 64(1), pp.43-71. ⟨10.1357/002224006776412340).⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1357/002224006776412340). hal-00280349 https://hal.archives-ouvertes.fr/hal-00280349 doi:10.1357/002224006776412340). |
op_doi |
https://doi.org/10.1357/002224006776412340 https://doi.org/10.1357/002224006776412340). |
container_title |
Journal of Marine Research |
container_volume |
64 |
container_issue |
1 |
container_start_page |
43 |
op_container_end_page |
71 |
_version_ |
1766129281381957632 |
spelling |
ftccsdartic:oai:HAL:hal-00280349v1 2023-05-15T17:31:37+02:00 Understanding the influence of Rossby waves on surface chlorophyll concentrations in the North Atlantic ocean Charria, G. Dadou, I. Cipollini, P. Drévillon, M. De Mey, P. Garçon, V. 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) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) DYNBIO LEGOS Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Echanges Côte-Large (ECOLA) 2005 https://hal.archives-ouvertes.fr/hal-00280349 https://doi.org/10.1357/002224006776412340 en eng HAL CCSD Yale University info:eu-repo/semantics/altIdentifier/doi/10.1357/002224006776412340). hal-00280349 https://hal.archives-ouvertes.fr/hal-00280349 doi:10.1357/002224006776412340). ISSN: 0022-2402 EISSN: 1543-9542 Journal of marine research https://hal.archives-ouvertes.fr/hal-00280349 Journal of marine research, Yale University, 2005, 64(1), pp.43-71. ⟨10.1357/002224006776412340).⟩ info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.1357/002224006776412340 https://doi.org/10.1357/002224006776412340). 2021-10-24T21:11:37Z International audience The variability (in space and time) of westward propagating Rossby waves is analyzed with a wavelet method between 10N and 40N in the North Atlantic Ocean using two remotely sensed data sets (Sea Level Anomalies - SLA and surface chlorophyll-a concentrations) in order to better understand the waves' characteristics and their impacts on the chlorophyll distribution. Signals with wavelengths between ∼ 500 km and ∼ 1000 km with ∼ 4- to ∼ 24-month periods were detected and identified as the first baroclinic mode of Rossby waves. The spatial and temporal information has also highlighted a particular situation in 1998 at 34N, with the simultaneous existence of two distinct wave components corresponding to wavelengths 500 km and 1000 km. Signatures of the waves in ocean color prompt the question of how Rossby waves influence surface chlorophyll concentrations. Several physical/biological processes have been suggested: the eddy pumping mechanism associated with nutrient injection, the uplifting of a deep chlorophyll maximum toward the surface, and the meridional advection of horizontal chlorophyll gradients by geostrophic currents associated with baroclinic Rossby waves. A statistical decomposition of the observed signal into the different processes modeled by Killworth et al. (2004) confirms a main contribution of the north-south advection of the surface chlorophyll-a gradients south of 28N. In this part of the basin, more than ∼ 70% of the signal is explained by this horizontal process. North of 28N, Rossby wave signatures seem to be due to the horizontal advection as well as the vertical nutrient injection (∼ 50% of the observed amplitude). This vertical mechanism may have an impact on the primary production in this part of the basin. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Marine Research 64 1 43 71 |