New global sea surface height internal tide atlas MIOST-IT 24

This study presents MIOST 2024 (MIOST24), a new global atlas of the sea surface height (SSH) signature of coherent internal tides derived from a single time inversion of 28-year (1993-2020) along-tracks altimetry dataset. The single inversion using a conjugate gradient algorithm, simultaneously resolves the contributions of internal tides and mesoscale eddy variability, unlike other methods which rely on separate mesoscale estimates. Compared to the MIOST 2022 version (MIOST22) by Ubelmann et al., 2022, MIOST24 is based on mode 1 and mode 2 internal tides wavelengths calculated from the vertical stratification profiles of the GLORYS12v1 climatology (1993-2020). MIOST24 atlases are available for the four major tidal components M2, K1, S2, 01. For these waves, the amplitudes and phases of coherent internal tides from MIOST24 are compared with existing atlases MIOST22 and HRET (by Zaron 2019). Additionally, the ability of the different atlases (MIOST24, MIOST22 and HRET) to remove the internal tide signal from altimetry data is evaluated over an independent period from 2021 to 2023.