Accuracy assessment of ocean tide loading computations for precise geodetic observations

Zahran, Khaled; Jentzsch, G.; Seeber, Günter

doi:10.1016/j.jog.2006.07.002

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…It is obvious that there are good frequency-dependent relations among the ocean tide loading vectors. The studies showed that the ocean tide models agree well with each other in pelagic ocean and differ from each other in local seas [37] . Therefore, in the calculation of ocean tide loading effects, not only the global ocean tide model of NAO99 is used, but also the tidal data in China seas developed by Fang et al is used to modify NAO99 model for local area [36] .…”

Section: Ocean Tide Loadingmentioning

confidence: 61%

Accurate Correction Models for Tidal Gravity in Chinese Continent

Zhou

Sun

2009

Chinese J of Geophysics

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Accurate correction models for tidal gravity in Chinese continent are developed by using the recent theoretical and experimental models for the Earth's tidal gravity, in which the loading effects of the global and local ocean tides are combined. The relative difference of tidal gravity variations induced from different Earth's tidal gravity models is less than 0.06%. The ocean tide loading effects are about 4% of the total tidal gravity in coastal area while they are about 1% in inland. The difference between the ocean tide loading effects estimated from global ocean tide models and modified global models with local tides is about 10% of the total ocean tide loading effects. And the interpolated and extrapolated ocean tide loading effects are about 3% of the total ones. Comparing the observed tidal gravity variations by superconducting gravimeter with the ones calculated through the correction models, it is confirmed that the models developed in this study can accurately predict the tidal gravity signatures with a precision much better than 0.5 × 10−8 m·s−2. Consequently, it is expected that the models should provide an effective reference and accurate correction models for gravity measurements.

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Section: Ocean Tide Loadingmentioning

confidence: 61%

Accurate Correction Models for Tidal Gravity in Chinese Continent

Zhou

Sun

2009

Chinese J of Geophysics

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“…It is a fact that the tide models have continually undergone tremendous improvements due to the use of orbital remotely sensed altimeter data in the last two to three decades or more. At the moment, most tide models have similar performances-that is, the tide output model differences are between a few centimeters and a maximum of 1 m in deep-water and shallow shelf regions, respectively (Zahran et al 2006;Saraceno et al 2010). The spatial resolution of GOT4.7 is 1 /28 3 1 /28, TPXO7.2 is 1 /48 3 1 /48, and FES2012 is 1 /168 3 1 /168.…”

Section: ) Tide Model Datamentioning

confidence: 99%

Extraction of Tide Constituents by Harmonic Analysis Using Altimetry Satellite Data in the Brazilian Coast

Daher¹,

Paes

França

et al. 2015

Journal of Atmospheric and Oceanic Technology

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This paper analyzes the sea surface height dataset from the TOPEX, Jason-1, and Jason-2 satellites of a 19-yr time series in order to extract the tide harmonic constituents for the region limited by latitude 58N-358S and longitude 558-208W. The harmonic analysis results implemented here were compared with the tidal constituents estimated by three classical tidal models [i.e., TOPEX/Poseidon Global Inverse Solution 7.2 (TPXO7.2), Global Ocean Tide 4.7 (GOT4.7), and Finite Element Solution 2102 (FES2102)] and also with those extracted from in situ measurements. The Courtier criterion was used to define the tide regimes and regionally they are classified as semidiurnal between the latitude range from approximately 58N to 228S, semidiurnal with diurnal inequality from 228 to about 298S, and mixed southward of latitude 228S. The comparison results among all tide approaches were done by analyzing the root-sum-square misfit (RSSmisfit) value. Generally, the RSSmisfit difference values are not higher than 12 cm among them in deep-water regions. On the other hand, in shallow water, all models have presented quite similar performance, and the RSSmisfit values have presented higher variance than the previous region, as expected. The major discrepancy results were particularly noted for two tide gauges located in the latitude range from 58N to 28S. The latter was investigated and conclusions have mainly pointed to the influence of the mouth of the Amazon River and the considerable distance between tide measurements and the satellite reference point, which make it quite hard to compare those results. In summary, the results have showed that all models presently generate quite reliable results for deep water; however, further study should done in order to improve them in shallow-water regions too.

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“…For the first generation of models the mass conservation is poorer and we try to re-allocate the mass bias by means of the code developed at the Royal Observatory of Belgium . Following Zahran (2000) suggestion we computed also mean tidal loadings for different combinations of models.…”

Section: Ocean Tides Loading Computationmentioning

confidence: 99%

A Trans-Siberian Tidal Gravity Profile (TSP) for the validation of the ocean tides loading corrections

Ducarme

Timofeev

Everaerts

et al. 2008

Journal of Geodynamics

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Tidal gravity observations have been performed across Siberia, along a profile extending from Novosibirsk to the West until Sakhalin Island to the East. All the stations were occupied by the same instrument (LCR402) for periods ranging from one to more than 2 years. The first goal was to compare the observed tidal parameters of the main tidal waves O1, K1 and M2 with modelled ones computed from nine different ocean tides models: SCW80, ORI96, CSR3, FES95, FES02, CSR4, GOT00, NAO99 and TPX06. In order to assess the overall accuracy of tidal predictions across Siberia, we selected also the best ocean tides models for long period tides, on the basis of previous comparisons.The observed amplitude factors and phase differences agree with the modelled ones within the associated RMS errors, generally at the level of 0.3%. On the other hand, the predicted tidal factors, computed from different ocean tides models, exhibit a high level of consistency (0.15%) on the Siberian territory. The tidal load vectors agree within 1 nm s −2 . A mean of the different load vectors will provide the most precise corrections, except in the area of the Sakhalin Island, where the most recent models fit better the observations. The final conclusion is that gravity tides predictions, based on the mean of the most recent ocean tides models, have a precision of the order of 5 nm s −2 on the Siberian territory.

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Accuracy assessment of ocean tide loading computations for precise geodetic observations

Cited by 11 publications

References 20 publications

Accurate Correction Models for Tidal Gravity in Chinese Continent

Accurate Correction Models for Tidal Gravity in Chinese Continent

Extraction of Tide Constituents by Harmonic Analysis Using Altimetry Satellite Data in the Brazilian Coast

A Trans-Siberian Tidal Gravity Profile (TSP) for the validation of the ocean tides loading corrections

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