Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation
International audience A realistic circulation model of the North Atlantic ocean at 0.25° resolution (NATL025 NEMO configuration) has been adapted to explicitly simulate model uncertainties. This is achieved by introducing stochastic perturbations in the equation of state to represent the effect of...
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ftccsdartic:oai:HAL:insu-01203709v1 2023-05-15T17:30:38+02:00 Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation Candille, Guillem Brankart, Jean-Michel Brasseur, Pierre Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2015-06 https://hal-insu.archives-ouvertes.fr/insu-01203709 https://hal-insu.archives-ouvertes.fr/insu-01203709/document https://hal-insu.archives-ouvertes.fr/insu-01203709/file/OCEAN%20SCIENCE%20-%20Assessment%20of%20an%20ensemble%20system%20that%20assimilates.pdf https://doi.org/10.5194/os-11-425-2015 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-11-425-2015 insu-01203709 https://hal-insu.archives-ouvertes.fr/insu-01203709 https://hal-insu.archives-ouvertes.fr/insu-01203709/document https://hal-insu.archives-ouvertes.fr/insu-01203709/file/OCEAN%20SCIENCE%20-%20Assessment%20of%20an%20ensemble%20system%20that%20assimilates.pdf doi:10.5194/os-11-425-2015 info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal-insu.archives-ouvertes.fr/insu-01203709 Ocean Science, European Geosciences Union, 2015, 11 (3), pp.425-438. ⟨10.5194/os-11-425-2015⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.5194/os-11-425-2015 2021-10-24T11:32:16Z International audience A realistic circulation model of the North Atlantic ocean at 0.25° resolution (NATL025 NEMO configuration) has been adapted to explicitly simulate model uncertainties. This is achieved by introducing stochastic perturbations in the equation of state to represent the effect of unresolved scales on the model dynamics. The main motivation for this work is to develop ensemble data assimilation methods, assimilating altimetric data from past missions Jason-1 and Envisat. The assimilation experiment is designed to provide a description of the uncertainty associated with the Gulf Stream circulation for years 2005/2006, focusing on frontal regions which are predominantly affected by unresolved dynamical scales. An ensemble based on such stochastic perturbations is first produced and evaluated using along-track altimetry observations. Then each ensemble member is updated by a square root algorithm based on the SEEK (singular evolutive extended Kalman) filter (Brasseur and Verron, 2006). These three elements – stochastic parameterization, ensemble simulation and 4-D observation operator – are then used together to perform a 4-D analysis of along-track altimetry over 10-day windows. Finally, the results of this experiment are objectively evaluated using the standard probabilistic approach developed for meteorological applications (Toth et al., 2003; Candille et al., 2007). Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Toth ENVELOPE(-155.250,-155.250,-86.367,-86.367) Ocean Science 11 3 425 438 |
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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 |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Candille, Guillem Brankart, Jean-Michel Brasseur, Pierre Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience A realistic circulation model of the North Atlantic ocean at 0.25° resolution (NATL025 NEMO configuration) has been adapted to explicitly simulate model uncertainties. This is achieved by introducing stochastic perturbations in the equation of state to represent the effect of unresolved scales on the model dynamics. The main motivation for this work is to develop ensemble data assimilation methods, assimilating altimetric data from past missions Jason-1 and Envisat. The assimilation experiment is designed to provide a description of the uncertainty associated with the Gulf Stream circulation for years 2005/2006, focusing on frontal regions which are predominantly affected by unresolved dynamical scales. An ensemble based on such stochastic perturbations is first produced and evaluated using along-track altimetry observations. Then each ensemble member is updated by a square root algorithm based on the SEEK (singular evolutive extended Kalman) filter (Brasseur and Verron, 2006). These three elements – stochastic parameterization, ensemble simulation and 4-D observation operator – are then used together to perform a 4-D analysis of along-track altimetry over 10-day windows. Finally, the results of this experiment are objectively evaluated using the standard probabilistic approach developed for meteorological applications (Toth et al., 2003; Candille et al., 2007). |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Candille, Guillem Brankart, Jean-Michel Brasseur, Pierre |
author_facet |
Candille, Guillem Brankart, Jean-Michel Brasseur, Pierre |
author_sort |
Candille, Guillem |
title |
Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation |
title_short |
Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation |
title_full |
Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation |
title_fullStr |
Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation |
title_full_unstemmed |
Assessment of an ensemble system that assimilates Jason-1/Envisat altimeter data in a probabilistic model of the North Atlantic ocean circulation |
title_sort |
assessment of an ensemble system that assimilates jason-1/envisat altimeter data in a probabilistic model of the north atlantic ocean circulation |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01203709 https://hal-insu.archives-ouvertes.fr/insu-01203709/document https://hal-insu.archives-ouvertes.fr/insu-01203709/file/OCEAN%20SCIENCE%20-%20Assessment%20of%20an%20ensemble%20system%20that%20assimilates.pdf https://doi.org/10.5194/os-11-425-2015 |
long_lat |
ENVELOPE(-155.250,-155.250,-86.367,-86.367) |
geographic |
Toth |
geographic_facet |
Toth |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal-insu.archives-ouvertes.fr/insu-01203709 Ocean Science, European Geosciences Union, 2015, 11 (3), pp.425-438. ⟨10.5194/os-11-425-2015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-11-425-2015 insu-01203709 https://hal-insu.archives-ouvertes.fr/insu-01203709 https://hal-insu.archives-ouvertes.fr/insu-01203709/document https://hal-insu.archives-ouvertes.fr/insu-01203709/file/OCEAN%20SCIENCE%20-%20Assessment%20of%20an%20ensemble%20system%20that%20assimilates.pdf doi:10.5194/os-11-425-2015 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-11-425-2015 |
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Ocean Science |
container_volume |
11 |
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3 |
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425 |
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438 |
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1766127509372403712 |