Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France

Melachroinos, Stavros; Biancale, R.; Llubes, Muriel; Pérosanz, F.; Lyard, Florent; Vergnolle, Mathilde; Bouin, Marie‐Noëlle; Masson, Frédéric; Nicolas, Jean‐Marie; Morel, Laurent; Durand, Stéphane

doi:10.1007/s00190-007-0185-6

Cited by 36 publications

(27 citation statements)

References 30 publications

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“…The OTL displacements and gravity values predicted by the NAO99b model for the semidiurnal and diurnal constituents are listed in Tables 3 and 4, respectively. We assessed the agreement between the GPS and the model estimates by comparing their RMS misfits [16,28]. For each of the eight tidal constituents j in each coordinate component k, the GPS/model RMS misfits for the n=1, ..., N sites are defined as…”

Section: Comparison With Modeled Otl Displacementsmentioning

confidence: 99%

Determination of ocean tide loading displacements in Hong Kong using GPS technique

Yuan

Ding

Sun

et al. 2010

Sci. China Earth Sci.

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Ocean tide loading (OTL) displacements of eight principal constituents at 12 sites in Hong Kong were determined using more than eight years of continuous GPS observations. Parameters of the OTL displacements were estimated using daily GPS solutions obtained with precise point positioning (PPP) technique. The results were compared with predictions from seven latest global ocean tide models. Gravity measurements of OTL in Hong Kong were also used to validate the GPS results. The study shows that the results from both the GPS and gravity measurements agree best with the GOT4.7 and NAO99b models, when the K 1 and K 2 constituents are excluded. The agreements between the GPS and the model estimates are generally at sub-millimeter level in both the horizontal and vertical directions, except for S 2 , K 2 and K 1 constituents that have relatively larger errors. After removing the systematic biases between the GPS and the model estimates, the misfits of M 2 , S 2 , N 2 , O 1 , P 1 and Q 1 at all sites are within 0.5 and 1.0 mm in the horizontal and the vertical directions, respectively, whereas K 1 and K 2 show relatively larger misfits of up to 2.3 mm. Both the GPS and the gravity S 2 estimates have large biases with unknown reasons when compared with the modeled values, which needs to be further investigated. The study demonstrates that GPS is capable of estimating the OTL displacements with the same accuracy as the model predictions, especially for coastal areas. GPS, ocean tide loading, ocean tide model, site displacement

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Section: Comparison With Modeled Otl Displacementsmentioning

confidence: 99%

Determination of ocean tide loading displacements in Hong Kong using GPS technique

Yuan

Ding

Sun

et al. 2010

Sci. China Earth Sci.

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“…1), with b x , b y , b z being its coordinates in the b-frame. It plays a very important role in the overall precision, as it has been previously demonstrated by Melachroinos (2004), because it introduces an amplification factor to the final displacements.…”

Section: The Lever Arm Effectmentioning

confidence: 82%

“…Recently, new functions have been added to render it capable of computing station positions in kinematic epoch-by-epoch mode (Melachroinos et al 2008). The processing scheme used here is a PPP strategy using CODE orbits, 5-s clocks and the L3 combination.…”

Section: The Gps Processing Strategymentioning

confidence: 99%

Removing attitude-related variations in the line-of-sight for kinematic GPS positioning

et al. 2010

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ISI Document Delivery No.: 785FG Times Cited: 1 Cited Reference Count: 18 Cited References: ANDERSEN OB, 2009, GEOD PLAN EARTH M BU BLEWITT G, 1989, J GEOPHYS RES-SOLID, V94, P10187, DOI 10.1029/JB094iB08p10187 Bock H, 2009, J GEODESY, V83, P1083, DOI 10.1007/s00190-009-0326-1 Bouin MN, 2009, J GEODESY, V83, P1203, DOI 10.1007/s00190-009-0338-x Chen G., 1998, THESIS MIT CAMBRIDGE Dai Z, 2009, GPS SOLUT, V13, P241, DOI 10.1007/s10291-008-0108-x Ge M, 2008, J GEODESY, V82, P389, DOI 10.1007/s00190-007-0187-4 King M, 2000, EARTH PLANETS SPACE, V52, P1043 King M, 2003, J GEODESY, V77, P15, DOI 10.1007/s00190-002-0308-z Georgiadou Y., 1988, Manuscripta Geodaetica, V13 Kouba J., 2009, GUIDE USING INT GNSS LAURICHESS D, 2007, P 20 INT TECH M SAT MELACHROINOS S, 2004, THESIS OBSERVATOIRE Melachroinos S.A., 2009, OC SEA SURF SCI TEAM Melachroinos SA, 2008, J GEODESY, V82, P357, DOI 10.1007/s00190-007-0185-6 PROVOST, 2010, EXPEDITION RES VESSE Schmid R, 2005, GPS SOLUT, V9, P283, DOI 10.1007/s10291-005-0134-x Wu J. T., 1993, Manuscripta Geodaetica, V18 Melachroinos, Stavros A. Tchalla, Mayaba Biancale, Richard Menard, Yves 1 SPRINGER HEIDELBERG HEIDELBERG GPS SOLUTWe are presenting a method for removing attitude-related variations (ATTRVs) in dynamic 1 Hz GPS positioning. The ATTRVs are separated into vertical and horizontal components. These result from the translational and rotational motions of the vehicle, which is a marine research vessel in our case. We have developed new observation equations that use corrected pseudoranges and carrier phases to account for ATTRVs. In the present contribution, we are only focusing on the vertical signals. These modeled ATTRVs are included as corrections in the line-of-sight (LoS) to each GPS satellite in the RINEX data sets using a new software called RNXATTCOR. Precise IGS sp3-orbits are used as inputs together with precise lever arm coordinates of the onboard GPS antennas, observations from the marine inertial navigation system and a priori 3D position of the vessel. The corrected RINEX data sets are then processed using kinematic processing or sequential processing in Precise Point Positioning (PPP) mode. The reduction of the standard deviation from a running mean in the final processed GPS time series is about 95%. The current method is being proposed for marine geodesy science applications such as along-track calibration/validation of altimetry products, and also for applications related to offshore kinematic high precision GPS positioning such as drilling, offshore platforms stability, marine pipeline positioning, earthquake monitoring and tsunami detection

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“…For instance, the atmospheric loading and wet troposphere-induced effect introduce diurnal variations in gravity and GPS coordinates, respectively (Neumeyer et al 2005). Moreover, non-linear sub-diurnal tides exist in areas with shallow water, and an important energy transfer exists in the quart-diurnal (6 hourly) band (Melachroinos et al 2007). Since this study focuses only on M 2 loading, signals or errors in the non-semidiurnal bands have little impact when investigating the M 2 loading based on the time series of gravity and GPS height values.…”

Section: Fg5 Gravity and Gps Measurementsmentioning

confidence: 99%

“…Such a local tidal model must outperform its global counterpart in both accuracy and spatial resolution in order to be more useful for the local users. Other factors impacting OTL model performance are coastlines, numerical integration of the Green's function and interpolations of the nearest grid value (Bos and Baker 2005;Melachroinos et al 2007). …”

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confidence: 99%

GPS Height and Gravity Variations Due to Ocean Tidal Loading Around Taiwan

Yeh¹,

Huang

2008

Surv Geophys

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This study presents predicts ocean tidal loading (OTL) effects using a Green's function approach and validates a novel tidal model for Taiwan. Numerical integration of OTL is performed using the Gauss quadrature method and a local tidal model for the inner zone and a global model for the outer zone. Observed time series of GPS-derived vertical displacements and gravity variations (3-7 days) at five co-located GPS-gravimeter stations along the South East China and Taiwan coasts were utilized to assess the accuracy of the proposed models and two other models. The OTL-induced gravity variations are 3-16 lgal and the vertical site displacements are 13-27 mm. Generally, an OTL model using a mixed global and local tidal model generates better agreement with the observations than an OTL model using a global tidal model only. However, containing a local model inside a global model does not always produce a good agreement with the observations. The relatively large discrepancies between modeled and observed OTL values at some stations indicate that there is a need for an improved local tidal model in the study area.

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Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France

Cited by 36 publications

References 30 publications

Determination of ocean tide loading displacements in Hong Kong using GPS technique

Determination of ocean tide loading displacements in Hong Kong using GPS technique

Removing attitude-related variations in the line-of-sight for kinematic GPS positioning

GPS Height and Gravity Variations Due to Ocean Tidal Loading Around Taiwan

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