Towards a global higher-frequency sea level data setP. L. Woodworth, J. R. Hunter, M. Marcos, P. Caldwell, M. Menéndez,, and I. Haigh https://doi.org/10.1002/gdj3.42
This is the first investigation of the worldwide distribution of the degree-3 M1 ocean tide using over 800 tide gauge records and a global tide model. M1 is confirmed to have a geographical variation in the Atlantic and other basins consistent with the suggestion of Platzman and Cartwright that M1 is generated through the spatial and temporal overlap of M1 in the tidal potential and one (or at least a small number of) diurnal ocean normal mode(s).
This is the first investigation of the worldwide distribution of the degree-3 M1 ocean tide...