Improved global sea surface height and currents maps from remote sensing and in situ observations
International audience We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale & multivariate mapping approach that offers the possibility to improve the physical content of...
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://hal.science/hal-04631712 https://hal.science/hal-04631712/document https://hal.science/hal-04631712/file/essd-2022-181.pdf https://doi.org/10.5194/essd-2022-181 |
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ftutoulouse3hal:oai:HAL:hal-04631712v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas Improved global sea surface height and currents maps from remote sensing and in situ observations |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale & multivariate mapping approach that offers the possibility to improve the physical content of gridded products by combining the data from various platforms and in resolving a broader spectrum of ocean surface dynamic than in the current operational mapping system. The dataset covers the entire global ocean and spans from 2016-07-01 to 2020-06-30. The multiscale approach decomposes the observed signal into different physical contributions. In the present study, we simultaneously estimate the mesoscale ocean circulations as well as part of the equatorial wave dynamics (e.g., tropical instability and Poincaré waves). The multivariate approach is able to exploit the geostrophic signature resulting from the synergy of altimetry and drifter observations. Sea level observations in Arctic leads are also used in the merging to improve the surface circulation in this poorly mapped region. A quality assessment of this new product is proposed against the DUACS operational product distributed in the Copernicus Marine Service. We show that the multiscale & multivariate mapping approach offers promising perspectives for reconstructing the ocean surface circulation: leads observations contribute to improve the coverage in delivering gap free maps in the Arctic; drifters observations help to refine the mapping in regions of intense dynamics where the temporal sampling must be accurate enough to properly map the rapid mesoscale dynamics; overall, the geostrophic circulation is better mapped in the new product, with mapping errors significantly reduced in regions of high variability and in the equatorial band; the effective resolution of this new product is hence between 5 % and 10 % finer than the Copernicus product. |
author2 |
Collecte Localisation Satellites (CLS) OceanNext Centre National d'Études Spatiales Toulouse (CNES) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-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)-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-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas |
author_facet |
Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas |
author_sort |
Ballarotta, Maxime |
title |
Improved global sea surface height and currents maps from remote sensing and in situ observations |
title_short |
Improved global sea surface height and currents maps from remote sensing and in situ observations |
title_full |
Improved global sea surface height and currents maps from remote sensing and in situ observations |
title_fullStr |
Improved global sea surface height and currents maps from remote sensing and in situ observations |
title_full_unstemmed |
Improved global sea surface height and currents maps from remote sensing and in situ observations |
title_sort |
improved global sea surface height and currents maps from remote sensing and in situ observations |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04631712 https://hal.science/hal-04631712/document https://hal.science/hal-04631712/file/essd-2022-181.pdf https://doi.org/10.5194/essd-2022-181 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
EISSN: 1866-3591 Earth System Science Data : Papers in open discussion https://hal.science/hal-04631712 Earth System Science Data : Papers in open discussion, 2022, ⟨10.5194/essd-2022-181⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/essd-2022-181 hal-04631712 https://hal.science/hal-04631712 https://hal.science/hal-04631712/document https://hal.science/hal-04631712/file/essd-2022-181.pdf doi:10.5194/essd-2022-181 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/essd-2022-181 |
_version_ |
1809894190971092992 |
spelling |
ftutoulouse3hal:oai:HAL:hal-04631712v1 2024-09-09T19:24:17+00:00 Improved global sea surface height and currents maps from remote sensing and in situ observations Ballarotta, Maxime Ubelmann, Clément Veillard, Pierre Prandi, Pierre Etienne, Hélène Mulet, Sandrine Faugère, Yannice Dibarboure, Gérald Morrow, Rosemary Picot, Nicolas Collecte Localisation Satellites (CLS) OceanNext Centre National d'Études Spatiales Toulouse (CNES) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-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)-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-Centre National de la Recherche Scientifique (CNRS) 2022-07-05 https://hal.science/hal-04631712 https://hal.science/hal-04631712/document https://hal.science/hal-04631712/file/essd-2022-181.pdf https://doi.org/10.5194/essd-2022-181 en eng HAL CCSD Copernicus Publications info:eu-repo/semantics/altIdentifier/doi/10.5194/essd-2022-181 hal-04631712 https://hal.science/hal-04631712 https://hal.science/hal-04631712/document https://hal.science/hal-04631712/file/essd-2022-181.pdf doi:10.5194/essd-2022-181 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess EISSN: 1866-3591 Earth System Science Data : Papers in open discussion https://hal.science/hal-04631712 Earth System Science Data : Papers in open discussion, 2022, ⟨10.5194/essd-2022-181⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2022 ftutoulouse3hal https://doi.org/10.5194/essd-2022-181 2024-07-11T04:20:31Z International audience We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale & multivariate mapping approach that offers the possibility to improve the physical content of gridded products by combining the data from various platforms and in resolving a broader spectrum of ocean surface dynamic than in the current operational mapping system. The dataset covers the entire global ocean and spans from 2016-07-01 to 2020-06-30. The multiscale approach decomposes the observed signal into different physical contributions. In the present study, we simultaneously estimate the mesoscale ocean circulations as well as part of the equatorial wave dynamics (e.g., tropical instability and Poincaré waves). The multivariate approach is able to exploit the geostrophic signature resulting from the synergy of altimetry and drifter observations. Sea level observations in Arctic leads are also used in the merging to improve the surface circulation in this poorly mapped region. A quality assessment of this new product is proposed against the DUACS operational product distributed in the Copernicus Marine Service. We show that the multiscale & multivariate mapping approach offers promising perspectives for reconstructing the ocean surface circulation: leads observations contribute to improve the coverage in delivering gap free maps in the Arctic; drifters observations help to refine the mapping in regions of intense dynamics where the temporal sampling must be accurate enough to properly map the rapid mesoscale dynamics; overall, the geostrophic circulation is better mapped in the new product, with mapping errors significantly reduced in regions of high variability and in the equatorial band; the effective resolution of this new product is hence between 5 % and 10 % finer than the Copernicus product. Article in Journal/Newspaper Arctic Université Toulouse III - Paul Sabatier: HAL-UPS Arctic |