marine lievin (cls, france); yann pageot (celad, france); clemence rubin (alten, france); sabine philipps (cls, france); gerald dibarboure (cnes, france); isabelino denis (cnes, france); thierry guinle (cnes, france); carolina nogueira loddo (cnes, france)

Since the launch of TOPEX/Poseidon in the early 90’s, more than 15 other Altimetry missions were launched and operated by different agencies. Our goal is to inter-calibrate all missions and provide as much as possible homogeneous up to date corrections. It allows us to build a precise sea level for level 3 CMEMS (Copernicus Marine Service) products, to have consistent time series in the last 30 years for C3S (Copernicus Climate Change Service) and to build the global mean sea level.



A new reprocessing campaign of all the altimeter L2P delayed time sea level products has started this spring, namely DT2024. This new campaign is based on the latest available L2 GDR/NTC processing. In terms of standards recommendations from the OSTST were taken into account and a thorough assessment of the corrections used to compute sea level anomaly was carried out to define the DT2024 standards.

Hereafter we present and assess the reprocessed L2P DT2024.

In the frame of the SALP (Service d’Altimétrie et de Localisation Précise) project supported by CNES (Centre National d’Etudes Spatiales) and of the Sentinel Marine Altimetry L2P-L3 Service (in cooperation agreement with EUMETSAT in the frame of the Copernicus Programme funded by the European Union) level 2P data are available to users for all the altimeter missions (TOPEX/Poseidon, Jason-1/2/3, ERS-1/2, Envisat, Saral/AltiKa, Sentinel-3A/B, Sentinel-6A, GFO, Cryosat-2, HY-2A/B) on AVISO+ ( https://www.aviso.altimetry.fr/en/data/products/sea-surface-height-products/global/along-track-sea-level-anomalies-l2p.html ) and L3 on CMEMS catalogue (https://marine.copernicus.eu).