Abstract:This paper investigates characteristic differences between GNSS coordinate time series induced by correction of different ocean tide models. Four ocean tide models (FES2004, EOT11a, TPXO7.2 and Chinasea2010) are selected to apply ocean tide loading correction on 23 CMONOC stations in coastal areas of China. Results show that the discrepancies of diurnal tide wave parameters can lead power variations of long-period/annual/semi-annual signal up to 4.3%, 2.6% and 2.0% respectively, which is 9.1%, 0.7% and 9.6% for semi-diurnal tide wave parameters. The outcomes indicate that ocean tide loading correction by Chinasea2010 and TPXO7.2 introduces a percentage increase (up to 43%) of a particular noise model combination among stations, which is white noise plus flicker noise plus random walk noise. However, as for the uncertainty of station velocity, the correction by FES2004 remains the most significant with a reduction of uncertainty reaching 60~98% for 39% of the selected stations.
FAN Wenlan,JIANG Weiping,YUAN Linguo et al. Effects of Ocean Tide Model Discrepancies on Periodic Signal and Noise Characteristic of GNSS Coordinate Time Series[J]. jgg, 2018, 38(9): 917-922.