Assimilation of satellite altimetry referenced to the new GRACE geoid estimate
Currently, two satellite gravimetric missions (CHAMP, GRACE) are dedicated to the improvement of our knowledge of the geoid, and one (GOCE) is planned in the near future. This will allow the absolute altimeter ocean height measurements to be exploited, instead of only sea level variations. In this p...
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ftunigrenoble:oai:HAL:hal-00212118v1 2024-05-12T08:08:03+00:00 Assimilation of satellite altimetry referenced to the new GRACE geoid estimate Birol, Florence Brankart, Jean-Michel Lemoine, J.M. Brasseur, Pierre Verron, Jacques Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Groupement de Recherche en Géodésie Spatiale (GRGS) Centre National d'Études Spatiales Toulouse (CNES) 2005 https://hal.science/hal-00212118 https://hal.science/hal-00212118/document https://hal.science/hal-00212118/file/Assimilation_of_satellite.pdf https://doi.org/10.1029/2004GL02329 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2004GL02329 hal-00212118 https://hal.science/hal-00212118 https://hal.science/hal-00212118/document https://hal.science/hal-00212118/file/Assimilation_of_satellite.pdf doi:10.1029/2004GL02329 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00212118 Geophysical Research Letters, 2005, 32 (6), pp.L06601. ⟨10.1029/2004GL02329⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2005 ftunigrenoble https://doi.org/10.1029/2004GL02329 2024-04-18T03:36:08Z Currently, two satellite gravimetric missions (CHAMP, GRACE) are dedicated to the improvement of our knowledge of the geoid, and one (GOCE) is planned in the near future. This will allow the absolute altimeter ocean height measurements to be exploited, instead of only sea level variations. In this paper, we evaluate the impact of the GRACE mission on ocean data assimilation. The new approach is to directly assimilate the full altimetric signal relative to the first release of a GRACE geoid. The response of an eddy‐permitting ocean model of the North Atlantic to the assimilation of this altimetric signal is analysed. The results are compared to that obtained using the usual approach, i.e., the assimilation of the dynamic topography derived from the addition of altimetric sea level anomalies and a mean dynamic topography estimate. Even if the GRACE mission resolution (333 km) is not yet compatible with oceanographic studies at mid latitude, we show that the geoid estimate can already be used with success in basin scale altimetric data assimilation problems. Article in Journal/Newspaper North Atlantic Université Grenoble Alpes: HAL |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Birol, Florence Brankart, Jean-Michel Lemoine, J.M. Brasseur, Pierre Verron, Jacques Assimilation of satellite altimetry referenced to the new GRACE geoid estimate |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
Currently, two satellite gravimetric missions (CHAMP, GRACE) are dedicated to the improvement of our knowledge of the geoid, and one (GOCE) is planned in the near future. This will allow the absolute altimeter ocean height measurements to be exploited, instead of only sea level variations. In this paper, we evaluate the impact of the GRACE mission on ocean data assimilation. The new approach is to directly assimilate the full altimetric signal relative to the first release of a GRACE geoid. The response of an eddy‐permitting ocean model of the North Atlantic to the assimilation of this altimetric signal is analysed. The results are compared to that obtained using the usual approach, i.e., the assimilation of the dynamic topography derived from the addition of altimetric sea level anomalies and a mean dynamic topography estimate. Even if the GRACE mission resolution (333 km) is not yet compatible with oceanographic studies at mid latitude, we show that the geoid estimate can already be used with success in basin scale altimetric data assimilation problems. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Groupement de Recherche en Géodésie Spatiale (GRGS) Centre National d'Études Spatiales Toulouse (CNES) |
format |
Article in Journal/Newspaper |
author |
Birol, Florence Brankart, Jean-Michel Lemoine, J.M. Brasseur, Pierre Verron, Jacques |
author_facet |
Birol, Florence Brankart, Jean-Michel Lemoine, J.M. Brasseur, Pierre Verron, Jacques |
author_sort |
Birol, Florence |
title |
Assimilation of satellite altimetry referenced to the new GRACE geoid estimate |
title_short |
Assimilation of satellite altimetry referenced to the new GRACE geoid estimate |
title_full |
Assimilation of satellite altimetry referenced to the new GRACE geoid estimate |
title_fullStr |
Assimilation of satellite altimetry referenced to the new GRACE geoid estimate |
title_full_unstemmed |
Assimilation of satellite altimetry referenced to the new GRACE geoid estimate |
title_sort |
assimilation of satellite altimetry referenced to the new grace geoid estimate |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00212118 https://hal.science/hal-00212118/document https://hal.science/hal-00212118/file/Assimilation_of_satellite.pdf https://doi.org/10.1029/2004GL02329 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00212118 Geophysical Research Letters, 2005, 32 (6), pp.L06601. ⟨10.1029/2004GL02329⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2004GL02329 hal-00212118 https://hal.science/hal-00212118 https://hal.science/hal-00212118/document https://hal.science/hal-00212118/file/Assimilation_of_satellite.pdf doi:10.1029/2004GL02329 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2004GL02329 |
_version_ |
1798850916485431296 |