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Consideration of tidal variations in the geocenter on satellite altimeter observations of ocean tides
Author(s) -
Desai Shailen D.,
Ray Richard D.
Publication year - 2014
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 - 10.1002/2014gl059614
Subject(s) - altimeter , geology , ocean tide , satellite , sea level , geodesy , ocean surface topography , ocean dynamics , climatology , oceanography , ocean current , aerospace engineering , engineering
Tidal geocenter motion has been previously ignored when developing ocean tide models from satellite altimetry. Accounting for tidal geocenter motion is necessary because the best orbit determinations for altimetric satellites position sea‐surface heights relative to the center of mass of the total Earth system, including the ocean tides. But the ocean tides are presumed relative to the Earth's crust and thus are effectively relative to the center of figure. By accounting for this effect, we find improved agreement between an altimeter‐based ocean tide model and bottom pressure recorder observations. The variance of differences between these two observations is reduced by 31% and 43% for the two tidal constituents with the largest contributions to geocenter variations, O 1 and K 1 , respectively. With this accommodation the predicted contribution from altimeter‐based ocean tide models to geocenter variations is amplified by 15–22%, providing improved agreement with observations, especially for the K 1 component.