Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products

This paper describes the demonstration of a regional high-resolution level-3 (L3) altimeter data unification and altimeter combination system (DUACS) developed with support from the French space agency (CNES). Deduced from full-rate (20 Hz to 40 Hz) level-2 (L2) altimeter measurements, this product...

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Detalhes bibliográficos
Autores: Pujol, Isabelle, Dupuy, Stéphanie, Vergara, Óscar, Sánchez-Román, Antonio, Faugère, Yannice, Prandi, Pierre, Dabat, Mei Ling, Dagneaux, Quentin, Lievin, Marine, Cadier, Emeline, Dibarboure, Gérald, Picot, Nicolas
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2023
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/338482
Acesso em linha:http://hdl.handle.net/10261/338482
https://api.elsevier.com/content/abstract/scopus_id/85147917273
Access Level:Acceso aberto
Palavra-chave:Altimetry
Mesoscale
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network_acronym_str ES
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repository_id_str
dc.title.none.fl_str_mv Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
title Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
spellingShingle Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
Pujol, Isabelle
Altimetry
Mesoscale
title_short Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
title_full Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
title_fullStr Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
title_full_unstemmed Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
title_sort Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry Products
dc.creator.none.fl_str_mv Pujol, Isabelle
Dupuy, Stéphanie
Vergara, Óscar
Sánchez-Román, Antonio
Faugère, Yannice
Prandi, Pierre
Dabat, Mei Ling
Dagneaux, Quentin
Lievin, Marine
Cadier, Emeline
Dibarboure, Gérald
Picot, Nicolas
author Pujol, Isabelle
author_facet Pujol, Isabelle
Dupuy, Stéphanie
Vergara, Óscar
Sánchez-Román, Antonio
Faugère, Yannice
Prandi, Pierre
Dabat, Mei Ling
Dagneaux, Quentin
Lievin, Marine
Cadier, Emeline
Dibarboure, Gérald
Picot, Nicolas
author_role author
author2 Dupuy, Stéphanie
Vergara, Óscar
Sánchez-Román, Antonio
Faugère, Yannice
Prandi, Pierre
Dabat, Mei Ling
Dagneaux, Quentin
Lievin, Marine
Cadier, Emeline
Dibarboure, Gérald
Picot, Nicolas
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
Centre National D'Etudes Spatiales (France)
Pujol, Isabelle [0000-0002-6701-6168]
Vergara, Óscar [0000-0001-5673-8192]
Sánchez-Román, Antonio [0000-0003-2432-7051]
Dabat, Mei Ling [0000-0001-8959-7066]
Dibarboure, Gérald [0000-0003-3644-2495]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Altimetry
Mesoscale
topic Altimetry
Mesoscale
description This paper describes the demonstration of a regional high-resolution level-3 (L3) altimeter data unification and altimeter combination system (DUACS) developed with support from the French space agency (CNES). Deduced from full-rate (20 Hz to 40 Hz) level-2 (L2) altimeter measurements, this product provides sea level anomalies (SLA) and other essential physical variables at a spatial resolution of one sample every ~1 km over the North Atlantic Ocean. This allows us to resolve wavelengths from ~35 km to ~55 km depending on the altimeter considered. This was made possible by recent advances in radar altimeter processing for both synthetic aperture radar (SAR) and low-resolution-mode (LRM) measurements, as well as improvements made to different stages of the DUACS processing chain. Firstly, the new adaptive and low-resolution with range migration correction (LR-RMC) processing techniques were considered for Jason and Sentinel-3 (S3A), respectively. They significantly reduce errors at short wavelengths, and the adaptive processing also reduces possible land contamination near the coast. Next, up-to-date geophysical and environmental corrections were selected for this production. This includes specific corrections intended to reduce the measurement noise on LRM measurements and thus enhance the observability at short wavelengths. Compared with the 1 Hz product, the observable wavelengths reached with the demonstration high-resolution product are reduced by up to one third, or up to half in the northeast Atlantic region. The residual noises were optimally filtered from full-rate measurements, taking into consideration the different observing capabilities of the altimeters processed. A specific data recovery strategy was applied, significantly optimizing the data availability, both in the coastal and open ocean areas. This demonstration L3 product is thus better resolved than the conventional 1 Hz product, especially near the coast, where it is defined up to ~5 km against ~10 km for the 1 Hz version. Multi-mission cross-calibration processing was also optimized with an improved long-wavelength error (LWE) correction, leading to a better consistency between tracks, with a 9–15% reduction in SLA variance at cross-overs. The new L3 product improves the overall consistency with tide gauge measurements, with a reduction in SLA differences variance by 5 and 17% compared with the 1 Hz product from the S3A and Jason-3 (J3) measurements, respectively. Primarily intended for regional applications, this product can significantly contribute to improving high-resolution numerical model output via data assimilation. It also opens new perspectives for a better understanding of regional sea-surface dynamics, with an improved representation of the coastal currents and a refined spectral content revealing the unbalanced signal.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/338482
https://api.elsevier.com/content/abstract/scopus_id/85147917273
url http://hdl.handle.net/10261/338482
https://api.elsevier.com/content/abstract/scopus_id/85147917273
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2021-001198
The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.3390/rs15030793
https://doi.org/10.3390/rs15030793
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling Refining the Resolution of DUACS Along-Track Level-3 Sea Level Altimetry ProductsPujol, IsabelleDupuy, StéphanieVergara, ÓscarSánchez-Román, AntonioFaugère, YannicePrandi, PierreDabat, Mei LingDagneaux, QuentinLievin, MarineCadier, EmelineDibarboure, GéraldPicot, NicolasAltimetryMesoscaleThis paper describes the demonstration of a regional high-resolution level-3 (L3) altimeter data unification and altimeter combination system (DUACS) developed with support from the French space agency (CNES). Deduced from full-rate (20 Hz to 40 Hz) level-2 (L2) altimeter measurements, this product provides sea level anomalies (SLA) and other essential physical variables at a spatial resolution of one sample every ~1 km over the North Atlantic Ocean. This allows us to resolve wavelengths from ~35 km to ~55 km depending on the altimeter considered. This was made possible by recent advances in radar altimeter processing for both synthetic aperture radar (SAR) and low-resolution-mode (LRM) measurements, as well as improvements made to different stages of the DUACS processing chain. Firstly, the new adaptive and low-resolution with range migration correction (LR-RMC) processing techniques were considered for Jason and Sentinel-3 (S3A), respectively. They significantly reduce errors at short wavelengths, and the adaptive processing also reduces possible land contamination near the coast. Next, up-to-date geophysical and environmental corrections were selected for this production. This includes specific corrections intended to reduce the measurement noise on LRM measurements and thus enhance the observability at short wavelengths. Compared with the 1 Hz product, the observable wavelengths reached with the demonstration high-resolution product are reduced by up to one third, or up to half in the northeast Atlantic region. The residual noises were optimally filtered from full-rate measurements, taking into consideration the different observing capabilities of the altimeters processed. A specific data recovery strategy was applied, significantly optimizing the data availability, both in the coastal and open ocean areas. This demonstration L3 product is thus better resolved than the conventional 1 Hz product, especially near the coast, where it is defined up to ~5 km against ~10 km for the 1 Hz version. Multi-mission cross-calibration processing was also optimized with an improved long-wavelength error (LWE) correction, leading to a better consistency between tracks, with a 9–15% reduction in SLA variance at cross-overs. The new L3 product improves the overall consistency with tide gauge measurements, with a reduction in SLA differences variance by 5 and 17% compared with the 1 Hz product from the S3A and Jason-3 (J3) measurements, respectively. Primarily intended for regional applications, this product can significantly contribute to improving high-resolution numerical model output via data assimilation. It also opens new perspectives for a better understanding of regional sea-surface dynamics, with an improved representation of the coastal currents and a refined spectral content revealing the unbalanced signal.This work was financially and technically supported by the French Space Agency (CNES) in the frame of the DUACS R&D project (ID 20221).The comparison between altimetry and in situ tide gauge measurements was carried out within the framework of the activities of the Spanish Government through the “Maria de Maeztu Centre of Excellence” accreditation to IMEDEA (CSIC-UIB) (CEX2021-001198). This work represents a contribution to CSIC Interdisciplinary Thematic Platform (PTI) Teledetección. (PTI-TELEDETECT).With funding from the Spanish government through the ‘María de Maeztu Unit of Excelence’ accreditation (CEX2021-001198)Peer reviewedMultidisciplinary Digital Publishing InstituteMinisterio de Ciencia e Innovación (España)Agencia Estatal de Investigación (España)Centre National D'Etudes Spatiales (France)Pujol, Isabelle [0000-0002-6701-6168]Vergara, Óscar [0000-0001-5673-8192]Sánchez-Román, Antonio [0000-0003-2432-7051]Dabat, Mei Ling [0000-0001-8959-7066]Dibarboure, Gérald [0000-0003-3644-2495]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/338482https://api.elsevier.com/content/abstract/scopus_id/85147917273reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2021-001198The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.3390/rs15030793https://doi.org/10.3390/rs15030793Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3384822026-05-22T06:33:51Z
score 15.811543

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