Estimates of ocean tide loading displacements and its impact on position time series in Hong Kong using a dense continuous GPS network

Yuan, Linguo; Ding, Xiaoli; Zhong, Ping; Chen, Wu; Huang, Dingfa

doi:10.1007/s00190-009-0319-0

Cited by 44 publications

(34 citation statements)

References 28 publications

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“…As discussed below, models of signals with long periods, such as from satellite modelling or propagation effects are not yet robust enough for geodetic GPS analysis software and errors of this type may still be present in state-of-the-art GPS analysis. Secondly, unmodelled sub-daily signals may propagate into longer-periods (e.g., Penna et al 2007;Yuan et al 2009) biasing and adding noise to geophysical estimates. Propagation of such signal depends on the nature of the unmodelled signal and also the GPS design matrix, and hence is sensitive to site location, satellite geometry and parameterisation, resulting in potentially complex propagation (Stewart et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…The origins of these sub-daily signals were not unambiguously identified by King et al (2008), who suggested local signal (e.g., multipath), propagation (e.g., higher order ionosphere) and orbit (e.g., solar radiation pressure) mismodelling. More recently, Yuan et al (2009) showed that changing the modelled K2 ocean tide loading displacement by a few millimetres gave a velocity bias of Surv Geophys (2010) 31:465-507 477 up to 1.0 mm/year (taken over the period [2000][2001][2002][2003][2004][2005][2006][2007] for sites in Hong Kong. Accurate observation-level models are therefore critical to obtaining accurate and precise site velocities such as are needed to constrain GIA models.…”

Section: Introductionmentioning

confidence: 99%

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Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

et al. 2010

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The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is 123Surv Geophys (2010) 31:465-507 DOI 10.1007/s10712-010-9100-4 uncertain due to insufficient constraints on our knowledge of past glacial changes and to large simplifications in the underlying Earth models. Consequently, we show differences between models that exceed several mm/year in terms of surface displacement for the two major ice sheets: Greenland and Antarctica. Geodetic measurements of surface displacement offer the potential for new constraints to be made on GIA models, especially when they are used to improve structural features of the Earth's interior as to allow for a more realistic reconstruction of the glaciation history. We present the distribution of presently available campaign and continuous geodetic measurements in Greenland and Antarctica and summarise surface velocities published to date, showing substantial disagreement between techniques and GIA models alike. We review the current state-of-the-art in ground-based geodesy (GPS, VLBI, DORIS, SLR) in determining accurate and precise surface velocities. In particular, we focus on known areas of need in GPS observation level models and the terrestrial reference frame in order to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

et al. 2010

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“…OTL surface displacements can reach several cm in magnitude in the vertical component for coastal areas, and are smaller but still detectable in the horizontal components (Vey et al 2002;Urschl et al 2005). Additionally, any mismodeling of diurnal and semidiurnal tidal constituents can be propagated to longerperiod signals in the GPS coordinate time series (Penna and Stewart 2003;Penna et al 2007;Yuan et al 2009), which results in spurious periodic variations. The magnitude of the OTL deformations makes correcting for them important during precise geodetic data analysis (e.g., van Dam et al 1997;Dragert et al 2000;King et al 2008), especially because the measurement and modeling of variations in time series is becoming more important.…”

Section: Introductionmentioning

confidence: 99%

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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“…GPS have been demonstrated to be able to analyze the temporal characteristics of the OTL effect [11]. Specifically, the amplitudes and phase lags of each constituent of the OTL displacement in a certain place can be estimated with GPS precise point positioning (PPP) [12][13][14][15]. In addition to the temporal feature, the OTL effect in sub-daily PPP solutions has a spatial feature approximating to the bilinear ramp function.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ocean Tide Loading in Differential InSAR Measurements

Peng¹,

Wang²,

Cao³

2017

Remote Sensing

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Ocean tide loading (OTL) causes crustal displacements in coastal regions, and the relative variation of these ground displacements may reach several centimeters across differential interferometric synthetic aperture radar (DInSAR) interferograms. However, orbit errors seriously affect the analysis of long-wavelength crustal deformation signals such as the OTL effect because of their similar signatures in DInSAR interferograms. To correct the orbit errors, we used a linear surface model to model the relative displacements of the Global Positioning System (GPS) precise point positioning (PPP) in the line of sight (LOS) direction as a priori parameter of the long-wavelength crustal deformation signals. After correcting the orbit errors, an ocean tide model was applied to correct the OTL effect in the DInSAR interferograms. The proposed approach was verified with the DInSAR interferograms from the Los Angeles basin. The experimental results confirm that the real orbit errors can be modeled by the bilinear ramp function under the constraint of the priori parameter. Moreover, after removing the orbit errors, the OTL effect, which is dominant in the long-wavelength crustal deformation signals, can be revealed, and then be effectively eliminated by the FES2004 tide model.

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Estimates of ocean tide loading displacements and its impact on position time series in Hong Kong using a dense continuous GPS network

Cited by 44 publications

References 28 publications

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

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

Analysis of Ocean Tide Loading in Differential InSAR Measurements

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