Evaluation of Ocean Tide Models Used for Jason-2 Altimetry Corrections

Fok, Hok Sum; İ̇z, H. Bâki; Shum, C. K.; Yi, Yuchan; Andersen, Ole; Braun, Alexander; Chao, Yi; Kuo, Chung-Yen; Matsumoto, Koji; Song, Y. Tony

doi:10.1080/01490419.2010.491027

Cited by 23 publications

(16 citation statements)

References 21 publications

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“…The GPS solutions themselves are biased at specific periods because, during the 24-h positioning process, the frame bias does not exactly average to zero over the course of the time period of the GPS solution (Penna and Stewart 2003;Stewart et al 2005;Penna et al 2007). This bias is Several recent studies have demonstrated that modern tidal models and OTL computation software produce very similar results (Thomas et al 2007;Penna et al 2008;Fok et al 2010). The difference between solutions using OTL-CM and OTL-CE coefficients is much larger than the difference that results from using different tidal models.…”

Section: Theoretical Interpretationmentioning

confidence: 88%

The effect of using inconsistent ocean tidal loading models on GPS coordinate solutions

Freymueller

Dam

2011

J Geod

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We use up to a 6-year span of GPS data from 85 globally distributed stations to compare solutions using ocean tidal loading (OTL) corrections computed in different reference frames: center of mass of the solid Earth (CE), and center of mass of the Earth system (CM). We compare solution sets that differ only in the frame used for the OTL model computations, for three types of GPS solutions. In global solutions with all parameters including orbits estimated simultaneously, we find coordinate differences of ∼0.3 mm between solutions using OTL computed in CM and OTL computed in CE. When orbits or orbits and clocks are fixed, larger biases appear if the user applies an OTL model inconsistent with that used to derive the orbit and clock products. Network solutions (orbits fixed, satellite clocks estimated) show differences smaller than 0.5 mm due to model inconsistency, but PPP solutions show distortions at the ∼1.3 mm level. The much larger effect on PPP solutions indicates that satellite clock estimates are sensitive to the OTL model applied. The time series of coordinate differences shows a strong spectral peak at a period of ∼14 days when inconsistent OTL models are applied and smaller peaks at ∼annual and ∼semi-annual periods, for both ambiguity-free and ambiguity-fixed solutions. These spurious coordinate variations disappear in solutions using consistent OTL models. Users of orbit and clock products must ensure that they

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Section: Theoretical Interpretationmentioning

confidence: 88%

The effect of using inconsistent ocean tidal loading models on GPS coordinate solutions

Freymueller

Dam

2011

J Geod

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“…However, this was not the case, even as recent as a decade ago. Although tide errors are now on the order of a few centimeters RMS in the open ocean (Fok et al, 2010), any remaining error in the model for a certain constituent will still alias into a small, undesired long-period signal. Although this was large, it was still better than errors in older tide models based only on tide gauge data or hydrodynamic models.…”

Section: Aliasingmentioning

confidence: 99%

Gravimetric Methods – Satellite Altimeter Measurements

Chambers

2015

Treatise on Geophysics

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“…The RSS of the In-phase and Quadrature amplitudes (RSSIQ) for the reference ground truth data over M major tides can be served as a denominator for the overall fraction of error of the ocean tide models against the ground truth data obtained from RSS, which is defined as (Fok et al 2010)…”

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confidence: 99%

Data fusion of multisatellite altimetry for ocean tides modelling: a spatio-temporal approach with potential oceanographic applications

Fok

2015

International Journal of Image and Data Fusion

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To cite this article: Hok Sum Fok (2015) Data fusion of multisatellite altimetry for ocean tides modelling: a spatio-temporal approach with potential oceanographic applications, International Journal of Image and Data Fusion, 6:3, 232-248, Nowadays, data combination/fusion is a common practice to integrate multiple data sources into a spatially and/or temporally regular data set for facilitating analysis and interpretation. Given the advancement in active remote sensing for monitoring our changing environment (no matter ocean, land or ice), the data acquisition from various spaceborne platforms with different spatio-temporal resolutions is enormous; calling for a need of multisatellite data combination. Instead of equally or spatially weighted solution, this article illustrates a spatio-temporal combination approach that weights data both in space and in time simultaneously for ocean tide modelling using multisatellite altimetry data sets under different spatial and temporal resolutions. The tide models generated from this approach show substantial improvement near coastal regions when compared to other contemporary ocean tide models by using independent pelagic and coastal tide gauges serving as ground truth. The discrepancy of the best model is~23%, three times larger than that of the deep ocean. Further improvement lies in more and better spatio-temporal observations in the near future. We anticipate this approach can be applied to other spatio-temporal data in a similar settings for spatio-temporal dependent unknown parameters, including geodetic, geophysical, oceanographic data and imagery under different spatial and temporal resolutions.

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Evaluation of Ocean Tide Models Used for Jason-2 Altimetry Corrections

Cited by 23 publications

References 21 publications

The effect of using inconsistent ocean tidal loading models on GPS coordinate solutions

The effect of using inconsistent ocean tidal loading models on GPS coordinate solutions

Gravimetric Methods – Satellite Altimeter Measurements

Data fusion of multisatellite altimetry for ocean tides modelling: a spatio-temporal approach with potential oceanographic applications

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