May 2024: MY DT-2021 interim temporal extension

Temporal extension in interim mode

In May 2024, a temporary interim extension of the MY DT-2021 series was made available. It differs from previous ones by a change in the altimetric standards and geophysical corrections used in the processing. Indeed, in preparation for an upcoming complete reprocessing of the series, the upstream data are now available in the DT-2024 standards described by (Kocha et al., 2023). These changes mainly consist of:

  • A new L2 product version for Jason-3 (GDR-F), Sentinel-3A (BC005) and Sentinel-6A (FC09), including improved retracking and associated Sea State bias correction.
  • The use of the new ocean-tide correction FES22.
  • The use of the new Mean Sea Surface combining the SIO22; CNES_CLS_22 and DTU21 versions for the geodetic missions and Sentinel-3B.

They are described in the Table . The use of the new standards contributes to improve the quality of the SLA field and derivates. They induce few regional biases (order of millimetre at regional scales) that will be managed in the L3/L4 processing for a seamless transition for users and ensure the continuity of the sea level at regional scales.

In order to differentiate this specific temporal extension from the historic series, the data will be delivered in specific “myint” product/datasets:

  • SEALEVEL_GLO_PHY_CLIMATE_L4_MY_008_057/c3s_obs-sl_glo_phy-ssh_myint_twosat-l4-duacs-0.25deg_P1D
  • SEALEVEL_GLO_PHY_L4_MY_008_047/cmems_obs-sl_glo_phy-ssh_myint_allsat-l4-duacs-0.25deg_P1D
  • SEALEVEL_GLO_PHY_L4_MY_008_047/cmems_obs-sl_glo_phy-ssh_myint_allsat-l4-duacs-0.25deg_P1M-m
  • SEALEVEL_GLO_PHY_L3_MY_008_062/cmems_obs-sl_glo_phy-ssh_myint_{mission}-l3-duacs_PT1S with mission bing [alg, c2n, h2b, j3n, s3a, s3b, s6a-lr]
  • SEALEVEL_EUR_PHY_L4_MY_008_068/cmems_obs-sl_eur_phy-ssh_myint_allsat-l4-duacs-0.125deg_P1D
  • SEALEVEL_EUR_PHY_L3_MY_008_061/cmems_obs-sl_eur_phy-ssh_myint_{mission}-l3-duacs_PT1S with mission bing [alg, c2n, h2b, j3n, s3a, s3b, s6a-lr]