Determination of Ocean Tide Loading Displacement by GPS PPP with Priori Information Constraint of NAO99b Global Ocean Tide Model

AbstractWe present a regionalized model of ocean tidal loading effects for the Argentine-German Geodetic Observatory in La Plata. It provides the amplitudes and phases of gravity variations and vertical deformation for nine tidal constituents to be applied as corrections to the observatory’s future geodetic observation data. This model combines a global ocean tide model with a model of the tides in the Río de la Plata estuary. A comparison with conventional predictions based only on the global ocean tide model reveals the importance of the incorporation of the regional tide model. Tidal loading at the observatory is dominated by the tides in the Atlantic Ocean. An additional contribution of local tidal loading in channels and groundwater is examined. The magnitude of the tidal loading is also reviewed in the context of the effects of solid earth tides, atmospheric loading and non-tidal loads.

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A global ocean tide model with high resolution in shelf areas

Marine Geophysical Research ◽

10.1007/bf00305424 ◽

1984 ◽

Vol 7 (1-2) ◽

pp. 231-246 ◽

Cited By ~ 7

Author(s):

Joachim Krohn

Keyword(s):

High Resolution ◽

Global Ocean ◽

Ocean Tide ◽

Ocean Tide Model ◽

Tide Model

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Influence of the modified global ocean tide model with local tides of East and South China Seas on load gravity in China and its neighbor area

Acta Seismologica Sinica ◽

10.1007/s11589-005-0085-x ◽

2005 ◽

Vol 18 (3) ◽

pp. 354-360 ◽

Cited By ~ 1

Author(s):

Jiang-cun Zhou ◽

He-ping Sun

Keyword(s):

South China ◽

Global Ocean ◽

Ocean Tide ◽

China Seas ◽

Ocean Tide Model ◽

Tide Model

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REFINE OF REGIONAL OCEAN TIDE MODEL USING GPS DATA

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-3-1685-2018 ◽

2018 ◽

Vol XLII-3 ◽

pp. 1685-1688

Author(s):

F. Wang ◽

P. Zhang ◽

Z. Sun ◽

Z. Jiang ◽

Q. Zhang

Keyword(s):

High Precision ◽

Global Ocean ◽

Ocean Tide ◽

Gps Tracking ◽

Inversion Method ◽

Observation Data ◽

Ocean Tide Model ◽

Tide Model ◽

Loading Effects ◽

Ocean Tide Models

Due to lack of regional data constraints, all global ocean tide models are not accuracy enough in offshore areas around China, also the displacements predicted by different models are not consistency. The ocean tide loading effects have become a major source of error in the high precision GPS positioning. It is important for high precision GPS applications to build an appropriate regional ocean tide model. We first process the four offshore GPS tracking station’s observation data which located in Guangdong province of China by using PPP aproach to get the time series. Then use the spectral inversion method to acquire eigenvalues of the Ocean Tidal Loading. We get the estimated value of not only ~12hour period tide wave (M2, S2, N2, K2) but also ~24hour period tide wave (O1, K1, P1, Q1) which has not been got in presious studies. The contrast test shows that GPS estimation value of M2, K1 is consistent with the result of five famous glocal ocean load tide models, but S2, N2, K2, O1, P1, Q1 is obviously larger.

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Asthenospheric anelasticity effects on ocean tide loading in the East China Sea region observed with GPS

10.5194/se-2019-133 ◽

2019 ◽

Author(s):

Junjie Wang ◽

Nigel T. Penna ◽

Peter J. Clarke ◽

Machiel S. Bos

Keyword(s):

East China Sea ◽

East China ◽

Ocean Tide ◽

Earth Model ◽

The East China Sea ◽

Ocean Tide Loading ◽

China Sea ◽

Ocean Tide Model ◽

Tide Model ◽

Gps Observations

Abstract. Anelasticity may decrease the shear modulus of the asthenosphere by 8–10 % at semi-diurnal tidal periods compared with the reference 1 s period of seismological Earth models. We show that such anelastic effects are likely to be significant for ocean tide loading displacement at the M2 tidal period around the East China Sea. By comparison with tide gauge observations, we establish that NAO99Jb is the most accurate numerical ocean tide model in this region, and that related errors in the predicted M2 vertical ocean tide loading displacements will be 0.2–0.5 mm. In contrast, GPS observations on the Ryukyu Islands (Japan), with uncertainty 0.2–0.3 mm, show discrepancies of over 1.5 mm with respect to ocean tide loading displacements predicted using the purely elastic radial Preliminary Reference Earth Model. We show that the use of an anelastic PREM-based Earth model reduces these discrepancies to no more than 0.8 mm, which is of the same order as the sum of the remaining errors due to uncertainties in the ocean tide model and the GPS observations. Use of a regional Earth model based on the laterally-varying S362ANI, with or without further empirical tuning, results in minor additional improvements in fit.

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