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| 1 | Adaptability of the ocean and earth tidal models based on global observations of the superconducting gravimeters显示文摘The adaptability of recent ocean tidal models and Earth tidal models is investigated comprehensively by means of 22 high precision tidal gravity observation series at 20 stations of the Global Geodynamics Project. Careful preprocessing of the original observations was carried out using international standard algorithms and the tidal gravity parameters were computed. The gravity load vectors of 8 main constituents are obtained based on loading computation theory and various global ocean models. The loading corrections of 14 secondary constituents are obtained based on a two-dimensional interpolation technique. Considering different characteristics of the wave amplitude, a method of “non-identical weighted mean” is developed for computing the av-eraged observed residual and remaining residual vectors at each station. The efficiency of the loading correction and the discrepancy between corrected amplitude factors and theoretical ones are analyzed. Meanwhile the calibration problem of the instruments is also discussed. After loading correction, the averaged tidal gravity parameters for all stations are obtained. The results show that the discrepancies between the global mean amplitude factors and theoretical values are less than 0.3%, the largest calibration error of the instruments is less than 0.5%. On the other hand, there are indications that the slight phase advance of K1 with respect to O1 in Mathews’ theory could be verified by ground based tidal gravity observations. | Ducarme Bernard Vandercoilden Leslie | 2005 | Science China Earth Sciences2005，48，11： | 8 |
| 2 | Combination of Tsoft and ET34-ANA-V80 software for the preprocessing and analysis of tide gauge data in French Polynesia显示文摘Since 2008 a network of five sea-level monitoring stations was progressively installed in French Polynesia.The stations are autonomous and data,collected at a sampling rate of 1 or 2 min,are not only recorded locally,but also transferred in real time by a radio-link to the NOAA through the GOES satellite.The new ET34-ANA-V80 version of ETERNA,initially developed for Earth Tides analysis,is now able to analyze ocean tides records.Through a two-step validation scheme,we took advantage of the flexibility of this new version,operated in conjunction with the preprocessing facilities of the Tsoft software,to recover co rrected data series able to model sea-level variations after elimination of the ocean tides signal.We performed the tidal analysis of the tide gauge data with the highest possible selectivity(optimal wave grouping)and a maximum of additional terms(shallow water constituents).Our goal was to provide corrected data series and modelled ocean tides signal to compute tide-free sea-level variations as well as tidal prediction models with centimeter precision.We also present in this study the characteristics of the ocean tides in French Polynesia and preliminary results concerning the non-tidal variations of the sea level concerning the tide gauge setting. | Bernard Ducarme Jean-Pierre Barriot Fangzhao Zhang | 2023 | Geodesy and Geodynamics2023，14，1： | 1 |
| 3 | The influence of pressure waves in tidal gravity records显示文摘For the reduction of atmospheric effects,observed gravity has initially been corrected by using the computed barometric admittance k of the in situ measured pressure,expressed in nms-2/hPa units and estimated by least squares method.However,the local pressure changes alone cannot account for the atmospheric mass attraction and loading when the coherent pressure field exceeds a specific size,i.e.,with increasing periodicities.To overcome this difficulty,it is necessary to compute the total atmospheric effect at each station using the global pressure field.However,the direct subtraction of the total gravity effect,provided by the models of pressure correction,is not yet satisfactory for S2 and other tidal components,such as K2 and P1,which include solar heating pressure tides.This paper identifies the origin of the problem and presents strategies to obtain a satisfactory solution.First,we set up a difference vector between the tidal factors of M2 and S2 after correction of the pressure and ocean tides effects.This vector,hereafter denoted as RES,presents the advantage of being practically insensitive to calibration errors.The minimum discrepancy between the tidal parameters of M2 and S2 corresponds to the minimum of the RES vector norm d.Secondly we adopt the hybrid pressure correction method,separating the local and the global pressure contribution of the models and replacing the local contribution by the pressure measured at the station multiplied by an admittance kATM.We tested this procedure on 8 stations from the IGETS superconducting gravimeters network(former GGP network).For stations at an altitude lower than 1000 m,the value of dopt is always smaller than0.0005.The discrepancy between the tidal parameters of the M2 and S2 waves is always lower than0.05% on the amplitude factors and 0.025° on the phases.For these stations,a correlation exists between the altitude and the value kopt.The results at the three Central European stations Conrad,Pecny and Vienna are in excellent agreement(0.05%) with the DDW99NH model for all the main tidal waves. | Bernard Ducarme | 2023 | Geodesy and Geodynamics2023，14，1： | 0 |
| 4 | Gravity observation at continental borderlands (Russia, Primorie, Cape Shults)显示文摘The paper is focused on different kinds of gravity results obtained in Shults Cape Observatory for 2010-2015.Gravity observation is interpreted together with GPS observation data which was obtained from2012 to 2015 at the same station.The station is situated on Gamov peninsular(42.58° N,131.15° E,Russia)at the coast of Japan Sea.This region constitutes the eastern boundary of Eurasia.This major continental tectonic feature is associated with a seismic activity,high heat flow and anomalous thickness of earth's crust.The goal of the observation was the investigation of gravity variation with time and seismicity situation monitoring.Gravity observation was developed at special basement by absolute gravimeter(GABL type) and by spring gravimeter(SCINREX CG-5and gPhone type).Tidal models were tested by results of observation with spring gravimeters.Reduction task was solved,as the experimental data received from different points of Shults Cape Observatory was used.Applied reduction coefficient is203.3 μGal m^(-1),and agrees with theoretical calculation.Next goal was studying structure of earth's crust by means of gravity models.Gravity anomaly varied from 30 mGal to 46 mGal,which also depend on difference reference system.Experimental results were used for testing of the structure of continental boundary,which also depends on the sea bottom flexion.Thickness of elastic layer was estimated from12 km to 18 km by using different models. | Vladimir Yu. Timofeev Eugenii N. Kalish Dmitriy G. Ardyukov Maksim G. Valitov Anton V. Timofeev Yurii F. Stus Ruslan G. Kulinich Dmitrii A. Nosov Igor S. Sizikov Bernard Ducarme | 2017 | Geodesy and Geodynamics2017，8，3： | 0 |
| 5 | Monitoring absolute vertical land motions and absolute sea-level changes from GPS and tide gauges data over French Polynesia显示文摘In this study,we estimate the absolute vertical land motions at three tidal stations with collocated Global Navigation Satellite System(GNSS)receivers over French Polynesia during the period 2007-2020,and obtain,as ancillary results,estimates of the absolute changes in sea level at the same locations.To verify our processing approach to determining vertical motion,we first modeled vertical motion at the International GNSS Service(IGS)THTI station located in the capital island of Tahiti and compared our estimate with previous independent determinations,with a good agreement.We obtained the following estimates for the vertical land motions at the tide gauges:Tubuai island,Austral Archipelago-0.92±0.17 mm/yr,Vairao village,Tahiti Iti:-0.49±0.39 mm/yr,Rikitea,Gambier Archipelago-0.43±0.17 mm/yr.The absolute variations of the sea level are:Tubuai island,Austral Archipelago 5.25±0.60 mm/yr,Vairao village,Tahiti Iti:3.62±0.52 mm/yr,Rikitea,Gambier Archipelago 1.52±0.23 mm/yr.We discuss these absolute values in light of the values obtained from altimetric measurements and other means in French Polynesia. | Xianjie Li Jean-Pierre Barriot Bernard Ducarme Marania Hopuare Yidong Lou | 2024 | Geodesy and Geodynamics2024，15，1： | 0 |
| 6 | Gravity and GPS Measurements at South-West Part of Baikal Rift显示文摘 | Timofeev Vladimir Ducarme Bernard Ardyukov Dmitriy Stus Yuriy Timofeev Anton Kalish Evgeniy Sizikov Igor Nosov Dmitriy | 2014 | Journal of Earth Science and Engineering2014，4，7： | 0 |
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