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Monthly and fortnightly tidal variations of the Earth's rotation rate predicted by a TOPEX/POSEIDON Empirical Ocean Tide Model
Author(s) -
Desai Shailen D.,
Wahr John M.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900182
Subject(s) - ocean tide , tide gauge , earth's rotation , residual , geology , oceanography , empirical modelling , solid earth , climatology , sea level , geodesy , environmental science , geophysics , mathematics , algorithm , computer science , programming language
Empirical models of the two largest constituents of the long‐period ocean tides, the monthly and the fortnightly constituents, are estimated from repeat cycles 10 to 210 of the TOPEX/POSEIDON (T/P) mission. These models are first validated with tide gauge observations which show residual variances with the T/P‐derived models that are of the order of 2–3 mm² for both the monthly and fortnightly constituents, and which are smaller than residual variances from respective equilibrium models of these long‐period ocean tides. These empirical models are used to predict the contribution that they each have on tidal variations of the Earth's rotation rate. For tidal variations in UT1 these contributions are predicted to be of the order of 0.1 ms with a scatter of the order of 8 and 3 µs for the monthly and fortnightly ocean tides, respectively.