07a94d2c-651a-4653-bd9b-af007eb7449b AVISO aviso@altimetry.fr editor 2026-01-08T11:03:01.261224Z ISO 19115-3:2018 - Remote Sensing ISO 19115-3:2018 - Remote Sensing http://www.opengis.net/def/crs/EPSG/0/4326 Wet troposphere correction from water vapour climate data records Wet troposphere correction from water vapour climate data records 2022-11-22 creation 2023-08-07 lastUpdate 2025-12-10 lastUpdate 2025-12-17 publication v2.0 The CDR-derived Wet Tropospheric Correction (WTC) Product V2 is generated from the Level-2+ along-track altimetry products version 2024 (L2P 2024) distributed by AVISO+ (www.aviso.altimetry.fr). It provides a long-term, homogenized estimation of the wet tropospheric correction based on Climate Data Records (CDRs) of atmospheric water vapour combined with high frequencies MWR data. Two independent CDRs datasets are used: - REMSS V7R2 (coverage until 2022) https://www.remss.com/measurements/atmospheric-water-vapor/tpw-1-deg-product/ - HOAPS V5 precursor CDR from EUMETSAT CM SAF (coverage until 2020) HOAPS V4/V5 data available via https://wui.cmsaf.eu Note: the HOAPS V5 precursor is not yet an official CM SAF product; full validation and public release are pending. The MWR/CDR WTC V2 estimates is derived using spatially varying but temporally constant polynomial coefficients (ai). 1. WTC V2 – Along-track L2P Product Data format: The WTC V2 product is delivered in Level-2+ (L2P) format, along the satellite ground track. Each mission is distributed as a compressed archive (.tar.gz) containing one NetCDF4 CF-1.8 file per mission cycle. Archive naming convention: <mission>_WTC_from_WV_CDR_<version>.tar.gz mission: TP (TOPEX/Poseidon), J1, J2, J3 version: product version (currently V2) File naming convention inside archives: <mission>_C<cycle>.nc cycle: 4-digit cycle index (e.g., C0001) Each NetCDF file contains: 1/ Along-track WTC estimate; 2/ Ancillary information; 3/ Space–time coordinates 2. WTC CDR Uncertainties – Gridded Product: A complementary product is provided, delivering regional trend estimates and associated uncertainties from the WTC Climate Data Record. The uncertainty product is distributed as a single NetCDF4 file: wtc_trend_uncertainties.nc . This file contains global gridded fields of WTC CDR trend and uncertainty parameters. Product content: This is the first dedicated version providing both: WTC CDR (HOAPS) linear trends, and Uncertainty estimates on these trends. Uncertainties are expressed as 1-sigma confidence intervals, and propagated using the methodology described in Section 2.3 of the Product User Manual. The product includes: - Total uncertainty on the WTC trend, propagated from all identified uncertainty sources in the WTC–TCWV regression. - Individual contributions of uncertainty sources (Uncertainties on regression coefficients: a0, a1 and their standard deviations; Uncertainties inherited from the HOAPS TCWV CDR) These fields enable users to assess the relative importance of each uncertainty component and recompute uncertainty propagation with alternative methods. Included regression input variables: To ensure transparency and reproducibility, the product provides: 1/ regression coefficients a0, a1; 2/ their associated uncertainties (std of a0, std of a1); 3/additional diagnostic fields required to recompute uncertainties if needed. CDS-AVISO Helpdesk AVISO aviso@altimetry.fr pointOfContact CDS-AVISO distributor Magellium originator CNES funder Fluctus originator LEGOS originator https://sextant.ifremer.fr/geonetwork/AVISO/api/records/07a94d2c-651a-4653-bd9b-af007eb7449b/attachments/fig.png Comparison of altimeter’s MWR-based, REMSS-derived and HOAPS-derived global mean wet troposphere corrections (GMWTC). Top: GMWTC time series. Bottom: Differences between CDR-derived GMWTC and altimeter’s MWR-based GMWTC. Update from Barnoud et al. (2023). Comparison of altimeter’s MWR-based, REMSS-derived and HOAPS-derived global mean wet troposphere corrections (GMWTC). Top: GMWTC time series. Bottom: Differences between CDR-derived GMWTC and altimeter’s MWR-based GMWTC. Update from Barnoud et al. (2023). Oceanographic geographical features Oceanographic geographical features Caractéristiques géographiques océanographiques GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication 2018-07-27 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Cersat - Project Cersat - Project 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_project Historical Historical Historique Cersat - Latency Cersat - Latency 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_latency CDS-AVISO CDS-AVISO CDS-AVISO Centre de données ODATIS Centre de données ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.odatis_centre_donnees /Observational data/satellite /Observational data/satellite /Données d'observation/satellite Type de jeux de donnée ODATIS Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee Sea surface height Sea surface height Hauteur de la surface de la mer ODATIS aggregation parameters and Essential Variable names ODATIS aggregation parameters and Essential Variable names 2025-07-29 publication geonetwork.thesaurus.external.theme.NVS.OD1 L4 L4 L4 Cersat - Processing level Cersat - Processing level 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_processing_level Atmospheric Water Vapour Atmospheric Water Vapour Vapeur d'eau atmosphérique Cersat - Parameter Cersat - Parameter 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_parameter Update Update None None Open Licence Open Licence Licence Ouverte If you use the data, please refer to Barnoud et al. (2023) and acknowledge: “The CDR-derived WTC product was produced by Magellium, Fluctus and LEGOS and distributed on the AVISO ODATIS portal (https://aviso.altimetry.fr) with support from CNES (https://doi.org/10.24400/527896/a01-2022.018 version XX).” If you use the data, please refer to Barnoud et al. (2023) and acknowledge: “The CDR-derived WTC product was produced by Magellium, Fluctus and LEGOS and distributed on the AVISO ODATIS portal (https://aviso.altimetry.fr) with support from CNES (https://doi.org/10.24400/527896/a01-2022.018 version XX).” grid 7 oceans -180.00 180.00 -90.00 90.00 1993-10-08 2025-09-30 L2P NetCDF NetCDF 4 https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/WTC_CDR-DT-007-MAG_PUM.pdf https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/WTC_CDR-DT-007-MAG_PUM.pdf WWW:LINK User guide Product User Manual (handbook) Product User Manual (handbook) Guide utilisateur (handbook) https://data.aviso.altimetry.fr/aviso-gateway/data/CDR-derived_WTC/ https://data.aviso.altimetry.fr/aviso-gateway/data/CDR-derived_WTC/ WWW:LINK Https server https://doi.org/10.1029/2022JC019378 https://doi.org/10.1029/2022JC019378 WWW:LINK-1.0-http--publication-URL Main publication link Barnoud A., Picard B., Meyssignac B., Marti F., Ablain M. and Roca R., 2023, Reducing the uncertainty in the satellite altimetry estimates of global mean sea level trends using highly stable water vapour climate data records. Journal of Geophysical Research: Oceans, 128, e2022JC019378, Barnoud A., Picard B., Meyssignac B., Marti F., Ablain M. and Roca R., 2023, Reducing the uncertainty in the satellite altimetry estimates of global mean sea level trends using highly stable water vapour climate data records. Journal of Geophysical Research: Oceans, 128, e2022JC019378, https://doi.org/10.24400/527896/a01-2022.018 https://doi.org/10.24400/527896/a01-2022.018 DOI Digital Object Identifier (DOI) Production and restricted distribution of the Basic SWOT L3_LR_SSH (2-km) version 0.3 product derived from the beta pre-validated L2_LR_SSH version 1.0 (summer 2023 reprocessing). Production and restricted distribution of the Basic SWOT L3_LR_SSH (2-km) version 0.3 product derived from the beta pre-validated L2_LR_SSH version 1.0 (summer 2023 reprocessing). v0.3 2023-12-22 Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 1.0 product derived from the L2_LR_SSH version C for both the Calibration (cycles 474 - 578) and Science (cycles 1 - 17) phases. Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 1.0 product derived from the L2_LR_SSH version C for both the Calibration (cycles 474 - 578) and Science (cycles 1 - 17) phases. v1.0 2024-05-07 Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 1.0.2 product for both the Calibration (cycles 474 - 578) and Science (cycle 1 - ongoing) phases. Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 1.0.2 product for both the Calibration (cycles 474 - 578) and Science (cycle 1 - ongoing) phases. v1.0.2 2024-09-10 Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 2.0 product for both the Calibration (cycles 474 - 578) and Science (cycle 1 - ongoing) phases. Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 2.0 product for both the Calibration (cycles 474 - 578) and Science (cycle 1 - ongoing) phases. v2.0 2025-01-27 Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 2.0.1 product for both the Calibration (cycles 474 - 578) and Science (cycle 1 - ongoing) phases. Production and distribution of the Basic SWOT L3_LR_SSH (2-km) version 2.0.1 product for both the Calibration (cycles 474 - 578) and Science (cycle 1 - ongoing) phases. v2.0.1 2025-03-15