Validating Earth and ocean tide models using tidal gravity measurements

Baker, T. F.; Bos, M. S.

doi:10.1046/j.1365-246x.2003.01863.x

Cited by 106 publications

(81 citation statements)

References 41 publications

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“…Continuous gravity observations (Baker and Bos 2003;Llubes and Mazzega 1997) , using a different spatial sampling to this study, have previously established that there is not a single global ocean tide model that fits observations equally well globally and that models perform differently in different regions. Whilst we have shown that GPS is not capable of distinguishing between the five models in an overall global comparison of OTLD, there are certain sites and constituents where GPS can separate the models at a 95% confidence level.…”

Section: Spatial Variationsmentioning

confidence: 89%

“…Baker and Bos (2003) have demonstrated that such gravity measurements were of sufficient accuracy to distinguish between different ocean tide models.…”

Section: Introductionmentioning

confidence: 93%

“…Since the late 1980s, geodetic techniques capable of measuring harmonic site displacements with millimetre-level accuracies (Allinson et al 2004;Schenewerk et al 2001), and corresponding gravitational variations with sub-0.1 µGal accuracies (Baker and Bos 2003) have been demonstrated at diurnal and semi-diurnal tidal frequencies.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of GPS, VLBI and model estimates of ocean tide loading displacements

Thomas

King

Clarke

2006

J Geod

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In recent years, Ocean Tide Loading Displacements (OTLD) have been measured using the Global Positioning System (GPS) and Very Long Baseline Interferometry (VLBI). This study assesses the accuracy of GPS measurements of OTLD by comparison with VLBI measurements and estimates derived from numerical ocean tide models. A daily precise point positioning (PPP) analysis was carried out on ~11 years of GPS data for each of 25 sites that have previous OTLD estimates based on data from co-located VLBI sites. Ambiguities were fixed to integer values where possible. The resulting daily estimates of OTLD, at eight principal diurnal and semi-diurnal tidal frequencies, were combined to give GPS measurements of OTLD at each site. The threedimensional GPS and VLBI measurements of OTLD were compared with estimates computed (by convolution with Green's functions) from five modern ocean tide models (CSR4.0, FES2004, GOT00.2, NAO99b,TPXO6.2). The GPS / model agreement is shown to be similar to the VLBI / model agreement. In the important radial direction, the GPS / model misfit is shown to be smaller than the VLBI / model misfit for seven of the eight tidal constituents; the exception being the K2 constituent. Fixing of GPS carrier phase ambiguities to integer values resulted in marginal improvement to the GPS / model agreement. Statistically, it is shown there is no significance to the difference between the fit of the GPS and VLBI measurements of OTLD to modelled values. Equally, differences in fit of either the complete set of GPS or VLBI estimates to the five sets of model derived values cannot be identified with statistical significance. It is thus concluded that, overall, we cannot distinguish between GPS and VLBI measurements of OTLD, and that at the global scale, present ocean tide models are accurate to within the current measurement noise of these techniques.

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Section: Spatial Variationsmentioning

confidence: 89%

“…Baker and Bos (2003) have demonstrated that such gravity measurements were of sufficient accuracy to distinguish between different ocean tide models.…”

Section: Introductionmentioning

confidence: 93%

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A comparison of GPS, VLBI and model estimates of ocean tide loading displacements

Thomas

King

Clarke

2006

J Geod

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“…Gravity effect due to ocean tide loading (OTL) is needed for correcting gravity measurements, assessing ocean tide models and validating the theory of tidal loading (Sato and Hanada 1984;Shum et al 1997;Yamamoto et al 2001;Baker and Bos 2003;Boy et al 2004;Neumeyer et al 2005;Hwang et al 2009). There are many OTL programs in the earth science community which serve such needs, e.g., GOTIC (Sato and Hanada 1984), OLFG/OL-MPP (Scherneck 1991), SPOTL (Agnew 1996), NLOADF (Agnew 1997), CARGA (Bos and Baker 2005), GOTIC2 (Matsumoto et al 2001) and g7.0 (g7 User's Manual 2007).…”

Section: Introductionmentioning

confidence: 99%

SGOTL: A Computer Program for Modeling High-Resolution, Height-Dependent Gravity Effect of Ocean Tide Loading

Hwang¹,

Huang²

2012

Terr. Atmos. Ocean. Sci.

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SGOTL, a computer package coded in FORTRAN, has been developed to model the gravity effect due to ocean tide loading (OTL), especially for a coastal station with large ocean tides. SGOTL uses a regional and a global tide model to account separately for near (inner) and far (outer) zone contributions, and optimizes an inner-zone region and grid interval for numerical convolution. Height dependent Green's functions for Newtonian and elastic effects are developed. The coastline is defined by the full-resolution GMT shoreline, and optionally a digital elevation model (DEM). A case study using gravity observations at the Hsinchu superconducting gravity station and some offshore islands around the Taiwan Strait suggests that SGOTL outperforms some selected global OTL programs and achieves an accuracy of 0.1 μGal for 8 leading tidal constituents.

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“…Fundamental differences between O1 and M2 are also implied by the work of Baker and Bos [2003], who found that tidal loading corrections to gravity data using a wide variety of ocean tide models led to more consistent and diminished residuals at the O1 than at the M2 frequency.…”

Section: Discussionmentioning

confidence: 81%

Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations

Dickman¹

2010

J. Geophys. Res.

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[1] Suitably generalized, ocean tide models can be used to determine the oceans' response to atmospheric pressure forcing; but the huge range of spatial and temporal scales of that forcing limits the relevance of state-of-the-art tide modeling techniques, like data assimilation, for such determinations. With an interest in its effects on Earth's rotation, in 1998 I employed a generalized but non-assimilating spherical harmonic tide model to determine the oceanic response to pressure forcing, however restricting its application to time scales exceeding a few days. This article revisits that spherical harmonic model in an attempt to improve its rotational predictions of short-period tides. We find that increasing the resolution of the model ocean does not by itself affect the tidal solution much, but varying the model's frictional parameters can produce diurnal tides whose effects on Earth's polar motion are similar to those of a variety of other ocean tide models. Such an improved model will allow our calculations of the oceans' dynamic response to pressure forcing, and the effects of that response on Earth's rotation, to be extended down to diurnal time scales.Citation: Dickman, S. R. (2010), Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations,

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Validating Earth and ocean tide models using tidal gravity measurements

Cited by 106 publications

References 41 publications

A comparison of GPS, VLBI and model estimates of ocean tide loading displacements

A comparison of GPS, VLBI and model estimates of ocean tide loading displacements

SGOTL: A Computer Program for Modeling High-Resolution, Height-Dependent Gravity Effect of Ocean Tide Loading

Rotationally acceptable ocean tide models for determining the response of the oceans to atmospheric pressure fluctuations

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