seanoe:74862 Prandi Pierre Collecte Localisation Satellites, Ramonville Saint-Agne, France 2025-06-05 ISO 19115:2003/19139 1.0 Error variance-covariance, trends, accelerations and uncertainties of regional mean sea level estimated from satellite altimetry 2020-11-12 2025-06-05 Prandi Pierre, Meyssignac Benoit, Ablain Michaël, Spada Giorgio, Ribes Aurélien (2020). Error variance-covariance, trends, accelerations and uncertainties of regional mean sea level estimated from satellite altimetry. SEANOE. https://doi.org/10.17882/74862 Satellite altimetry missions provide a quasi-global synoptic view of sea level over more than 25 years. The satellite altimetry constellation is used to build sea level maps and regional sea level indicators such as trends and accelerations. Estimating realistic uncertainties on these quantities is crucial to address some current climate science questions such as climate change detection and attribution or regional sea level budget closure for example. Previous studies have estimated the uncertainty for the global mean sea level (GMSL), but no uncertainty information is available at regional scales. In this study we estimate a regional satellite altimetry error budget and use it to derive maps of confidence intervals for local sea rise rates and accelerations. We analyze 27 years of satellite altimetry maps and derive the satellite altimetry error variance-covariance matrix at each grid point, prior to the estimation of confidence intervals on local trends and accelerations at the 90% confidence level using extended least squares estimators. Over 1993–2019, we find that the average local sea level trend uncertainty is 0.83 mm.yr-1 with local values ranging from 0.78 to 1.22 mm.yr-1. For accelerations, uncertainties range from 0.057 to 0.12 mm.yr-2, with a mean value of 0.063 mm.yr-2.   Change history: - 2020/07/08: initial dataset submission over 1993-2018 - 2020/10/21: 1993-2019 update and addition of error levels We thank ESA and CNES for their support. Prandi Pierre Collecte Localisation Satellites, Ramonville Saint-Agne, France Meyssignac Benoit CNES, LEGOS, Toulouse, France Ablain Michaël Magellium, Ramonville Saint-Agne, France Spada Giorgio Urbino University, DiSPeA, Urbino, Italy Ribes Aurélien CNRM - Centre National de Recherche Météorologique, France SEANOE https://www.seanoe.org/data/00637/74862/illustration.gif satellite altimetry error covariance sea level uncertainties Physical oceanography Sea surface height ODATIS aggregation parameters and Essential Variable names 2024-09-16 geonetwork.thesaurus.external.theme.NVS.OD1 Physical oceanography SeaDataNet Parameter Disciplines 2021-04-07 geonetwork.thesaurus.external.parameter.NVS.P08 /Observational data/in-situ Type de jeux de donnée ODATIS 2024-10-15 geonetwork.thesaurus.local.theme.type_jeux_donnee CC-BY (Creative Commons - Attribution) Estimates of Atlantic meridional heat transport from spatiotemporal fusion of Argo, altimetry and gravimetry data 2025 Copernicus GmbH Calafat Francisco M. Vallivattathillam Parvathi Frajka-Williams Eleanor 10.5194/egusphere-2025-1216 Local sea level trends, accelerations and uncertainties over 1993–2019 2021 Springer Science and Business Media LLC Prandi Pierre Meyssignac Benoit Ablain Michaël Spada Giorgio Ribes Aurélien Benveniste Jérôme 10.1038/s41597-020-00786-7 oceans -180.0 180.0 -90.0 90.0 1993 2019 NC, NETCDF https://www.seanoe.org/data/00637/74862/#77853 WWW:DOWNLOAD-1.0-link--download Quality controlled data 1993-2019 data - 47 MB https://www.seanoe.org/data/00637/74862/ WWW:DOWNLOAD-1.0-link--download Processed data 1993-2018 data [RESTRICTED] - 42 MB https://doi.org/10.17882/74862 WWW:LINK-1.0-http--metadata-URL DOI of the product https://www.seanoe.org/data/00637/74862/ rel-canonical Seanoe