f63f1d84-d3a2-4f10-a0bd-bb9641039bb2 CERSAT Exploitation fpaf@ifremer.fr editor 2026-01-21T09:46:36.165751Z ISO 19115-3:2018 - Remote Sensing http://www.opengis.net/def/crs/EPSG/0/4326 4-Dimensional Daily Temperature and Marine Heatwaves Categories from ESA/CAREHeat project, version 2 2026-01-18 creation 2026-01-18 publication CAREHEAT_ARMOR4D_MHW_GLO_HR 2.0 The 4D Marine Heatwaves (MHW) atlas contains 4D (x, y, z, t) **daily temperature and marine heatwaves categories** for global region [82.875°S-89.875°N, 0.125°E-359.875°E], from 0 to 300m depth and a spatial resolution of 1/8°. It covers the period 1993-2022. The MHW atlas has been computed from the temperature 4D fields of the ARMOR3D global product delivered in the Copernicus Marine Service (MULTIOBS_GLO_PHY_TSUV_3D_MYNRT_015_012 - https://doi.org/10.48670/moi-00052 ). The MHW categories are derived from the Hobday’s method [Hobday et al.,2018]. Each MHW event is classified among four categories (moderate to extreme), identified in terms of multiples of the local difference between the 90th percentile and climatological values, and defined as moderate (1-2×, Category I), strong (2-3×, Category II), severe (3-4×, Category III), and extreme (>4×, Category IV). When the category is zero, this means that there is no MHW. The period 1993-2021 is used as a baseline for defining the climatology to be as close as possible to the 30-year period suggested by Hobday. This choice is motivated by the need of altimetry data to constrain the vertical temperature reconstruction, which is required for most ocean reanalyses as well. Additionally, ancillary data are provided together with the data. It consists of 4D daily **temperature climatology** and **90 percentiles of the temperature**. These fields have been used to compute the MHW categories. They are delivered over the same domain as the MHW atlas. ARMOR3D **temperature uncertainties** are also supplied as they can help users to select only the most reliable events in the database. This dataset was generated by CLS (Collecte Localisation satellite) and is distributed by Ifremer /CERSAT in the frame of the CAREHeat project (CAREHeat Website) funded by the European Space Agency (ESA). completed Helpdesk CERSAT cersat@ifremer.fr pointOfContact Nathalie Verbrugge CLS nverbrugge@groupcls.com author Ifremer/CERSAT > Satellite Data Processing and Distribution Center of the French Research Institute for Exploitation of the Sea distributor ESA/ESRIN > European Space Agency, European Space Research Institute, Frascati Italy funder Nathalie Verbrugge CLS nverbrugge@groupcls.com principalInvestigator https://sextant.ifremer.fr/geonetwork/srv/api/records/f63f1d84-d3a2-4f10-a0bd-bb9641039bb2/attachments/mhw_in_careheat_armor4d_mhw_0.125_glo_20220801.png Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2018-01-01 publication 2018-07-27T14:39:48 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Ocean Temperature Cersat - Parameter 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_parameter CAREHeat Cersat - Project 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_project Historical Cersat - Latency 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_latency /Ocean Temperature Cersat - GCMD parameter 2024-01-04 publication geonetwork.thesaurus.external.theme.GCMDparameter CDS-CERSAT Centre de données ODATIS 2026-01-19 publication geonetwork.thesaurus.local.theme.odatis_centre_donnees Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee ODATIS aggregation parameters and Essential Variable names 2023-11-27 publication 2023-11-27 publication geonetwork.thesaurus.external.theme.NVS.OD1 National Services Observation 2024-01-04 publication 2024-01-04 publication geonetwork.thesaurus.local.theme.SNO Research Infrastructure 2023-12-22 publication 2023-12-22 publication geonetwork.thesaurus.local.theme.IR None CC-BY (Creative Commons - Attribution) grid 0.125 oceans -180.00 180.00 -82.875 89.875 Global 1993-01-05 2022-12-31 L4 https://data-cersat.ifremer.fr/data/marine-heat-wave/esa-careheat/4d-mhw-cls/Global/v2/ WWW:LINK Ifremer HTTPS server https://doi.org/10.12770/f63f1d84-d3a2-4f10-a0bd-bb9641039bb2 DOI Digital Object Identifier (DOI)