TY  - JOUR
A1  - Karbon, Maria
A1  - Balidakis, Kyriakos
A1  - Belda, Santiago
A1  - Nilsson, Tobias
A1  - Hagedoorn, Jan
A1  - Schuh, Harald
T1  - Long-Term evaluation of ocean tidal variation models of polar motion and UT1
JF  - Pure and applied geophysics
N2  - Recent improvements in the development of VLBI (very long baseline interferometry) and other space geodetic techniques such as the global navigation satellite systems (GNSS) require very precise a-priori information of short-period (daily and sub-daily) Earth rotation variations. One significant contribution to Earth rotation is caused by the diurnal and semi-diurnal ocean tides. Within this work, we developed a new model for the short-period ocean tidal variations in Earth rotation, where the ocean tidal angular momentum model and the Earth rotation variation have been setup jointly. Besides the model of the short-period variation of the Earth’s rotation parameters (ERP), based on the empirical ocean tide model EOT11a, we developed also ERP models, that are based on the hydrodynamic ocean tide models FES2012 and HAMTIDE. Furthermore, we have assessed the effect of uncertainties in the elastic Earth model on the resulting ERP models. Our proposed alternative ERP model to the IERS 2010 conventional model considers the elastic model PREM and 260 partial tides. The choice of the ocean tide model and the determination of the tidal velocities have been identified as the main uncertainties. However, in the VLBI analysis all models perform on the same level of accuracy. From these findings, we conclude that the models presented here, which are based on a re-examined theoretical description and long-term satellite altimetry observation only, are an alternative for the IERS conventional model but do not improve the geodetic results.
KW  - Ocean tidal model
KW  - VLBI analysis
KW  - Euler-Liouville
Y1  - 2018
U6  - https://doi.org/10.1007/s00024-018-1866-1
SN  - 0033-4553
SN  - 1420-9136
VL  - 175
IS  - 5
SP  - 1611
EP  - 1629
PB  - Springer
CY  - Basel
ER  -