Gravity field variations from superconducting gravimeters for GRACE validation

Weise, A.; Kröner, C.; Abe, Masakazu; Ihde, J.; Jentzsch, G.; Naujoks, M.; Wilmes, H.; Wziontek, Hartmut

doi:10.1016/j.jog.2009.09.034

Cited by 31 publications

(17 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For filter lengths of about 1000 km, closest correspondence to the SG gravity residuals is obtained. This is in accordance with the results published previously by Hinderer et al (2006), Neumeyer et al (2006b, and Weise et al (2009). It is interesting that it is necessary to apply rather strong filters in order to make time series derived from GRACE observations comparable with the corresponding time series based on SG.…”

Section: Comparison Of Grace Gravity Variations Against Sg Observationssupporting

confidence: 91%

“…The close-up range of 1 km around the station has not been considered here. With respect to the interim comparison for three stations in Weise et al (2009), the general agreement in the seasonal signals is confirmed by the three additional European SG stations, with maximum signal amplitudes in winter/spring and minimum signal amplitudes at the end of summer. The SG time series at the Moxa, Strasbourg, Vienna, and Wettzell sites were reduced for the local hydrological effect, taking into account the individual local station conditions (Section 2).…”

Section: Comparison Of Terrestrial and Satellite-derived Gravity Fielmentioning

confidence: 55%

“…In the case of subsurface stations (stations below surface or with considerable topography nearby) the attraction effect additionally depends on the location of water mass changes above the gravity sensor, a significant effect which typically can reach a few tens nm/s 2 . In the latter case the possible consequence is that the gravity residuals might be anti-correlated with the local seasonal hydrology (Kroner, 2001;Weise et al, 2009). Modelling the individual impact is essential in order to separate local and regional from large-scale hydrological contributions.…”

Section: Reduction Of Local Hydrological Effectsmentioning

confidence: 99%

“…By contrast, our findings indicate that due to the systematic character of the local/regional hydrological impact at each individual station, these effects should be estimated and reduced properly from the time series of SG gravity residuals. Weise et al (2009) and Naujoks et al (2010 show exemplarily for the Moxa station that the local hydrological effects can mask the seasonal signal of global hydrology depending on local station conditions. However, they also show that these effects can be successfully modelled and reduced.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tackling mass redistribution phenomena by time-dependent GRACE- and terrestrial gravity observations

Weise

Kröner

Abe

et al. 2012

Journal of Geodynamics

Self Cite

View full text Add to dashboard Cite

Section: Comparison Of Grace Gravity Variations Against Sg Observationssupporting

confidence: 91%

Section: Comparison Of Terrestrial and Satellite-derived Gravity Fielmentioning

confidence: 55%

Section: Reduction Of Local Hydrological Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tackling mass redistribution phenomena by time-dependent GRACE- and terrestrial gravity observations

Weise

Kröner

Abe

et al. 2012

Journal of Geodynamics

Self Cite

View full text Add to dashboard Cite

“…A comparison between the terrestrial gravity data from Moxa station, GRACE satellite-derived gravity field variations for a Gauss filtering with fl = 10 and fl = 13, respectively (Neumeyer et al 2006(Neumeyer et al , 2008Weise et al 2009), and gravity changes based on the Water-GAP Global Hydrology Model (WGHM) (Döll et al 2003) is given in Fig. 12(b).…”

Section: Large-scale Considerationsmentioning

confidence: 99%

Evaluating local hydrological modelling by temporal gravity observations and a gravimetric three-dimensional model

Naujoks¹,

Kröner

Weise³

et al. 2010

Geophysical Journal International

Self Cite

View full text Add to dashboard Cite

SUMMARY An approach for the evaluation of local hydrological modelling is presented: the deployment of temporal terrestrial gravity measurements and gravimetric 3‐D modelling in addition to hydrological point observations. Of particular interest is to what extent such information can be used to improve the understanding of hydrological process dynamics and to evaluate hydrological models. Because temporal gravity data contain integral information about hydrological mass changes they can be considered as a valuable augmentation to traditional hydrological observations. On the other hand, hydrological effects need to be eliminated from high‐quality gravity time‐series because they interfere with small geodynamic signals. In areas with hilly topography and/or inhomogeneous subsoil, a simple reduction based on hydrological point measurements is usually not sufficient. For such situations, the underlying hydrological processes in the soil and the disaggregated bedrock need to be considered in their spatial and temporal dynamics to allow the development of a more sophisticated reduction. Regarding these issues interdisciplinary research has been carried out in the surroundings of the Geodynamic Observatory Moxa, Germany. At Moxa, hydrologically induced gravity variations of several 10 nm s−2 are observed by the stationarily operating superconducting gravimeter and by spatially distributed and repeated high‐precision measurements with transportable relative instruments. In addition, hydrological parameters are monitored which serve as input for a local hydrological catchment model for the area of about 2 km2 around the observatory. From this model, spatial hydrological variations are gained in hourly time steps and included as density changes of the subsoil in a well‐constrained gravimetric 3‐D model to derive temporal modelled gravity variations. The gravity variations obtained from this combined modelling correspond very well to the observed hydrological gravity changes for both, short period and seasonal signals. From the modelling the amplitude of the impact on gravity of hydrological changes occurring in different distances to the gravimeter location can be inferred. Possible modifications on the local hydrological model are discussed to further improve the quality of the model. Furthermore, a successful reduction of local hydrological effects in the superconducting gravimeter data is developed. After this reduction global seasonal fluctuations are unmasked which are in correspondence to GRACE observations and to global hydrological models.

show abstract

An Analysis to Observations of the Superconducting Gravimeter at the Jiufeng Seismic Station, Wuhan

Jin

Li²,

Shen

et al. 2012

Chinese J of Geophysics

View full text Add to dashboard Cite

The relationship between the mass transfer in the Earth and vertical deformation can be studied using continuous relative gravimetry and continuous GPS observations. Compared to mobile relative gravimetry and absolute gravimetry, continuous relative gravimetry permits to monitor the whole process of gravity changes and mass transfer, avoiding the problems from low measurement precision and temporal resolution. In this paper, more than 13000 hours gravity data recorded at the Jiufeng seismic station using the superconducting gravimetry (SGC053) are analyzed along with the data of co‐located absolute gravimetry, air pressure, vertical displacement of surrounding GPS stations, WUHN IGS site and WHJF site, GRACE monthly time‐variable gravity and two global continental water storage models (GLDAS, CPC). Gravity variations affected by solid earth tide, air pressure, pole tide and continental water loading are corrected using the harmonic analysis method, atmospheric pressure admittance model, pole tide model and the correlation analysis with GRACE results and/or water storage models, then instrument drift is also corrected using co‐located absolute gravity measurements. Based on the above processing, the relationship between the residual gravity time series and GPS vertical deformation is addressed. The harmonic analysis result for SGC053 gravity records, spanning about one and half years, shows that the white noise is about (1.14~1.40)×10–8 m·s–2 and the tidal factor error of dominant tidal groups reach about 0.10/00. Compared to ocean tide loading (3×10–8 m·s–2), the gravity due to air pressure (12×10–8 m·s–2) and pole tide (10×10–8 m·s–2) is much large. The drift of SGC053, about 2.18×10–8(m·s–2)/a, is estimated using 4 absolute gravity co‐located records of FG5‐232. The result shows that the residual gravity caused by continental water loading in summer and autumn is about (6~8) × 10–8 m·s–2, by comparing residual gravity variations with both GARCE result and global continental water loading (GLDAS, CPC). Gravity variations corrected by water loading show a perfect negative correlation with the vertical deformation of the GPS station, about 15 km away from SGC053, so as to data in spring and winter. And the vertical crustal deformation is subsidence and the gravity change rate is about 1.79×10–8 (m·s–2)/a. The ratio of the changes in gravity and altitude related to the local vertical crustal movement is about –354×10–8 (m·s–2)/m.

show abstract

Gravity field variations from superconducting gravimeters for GRACE validation

Cited by 31 publications

References 22 publications

Tackling mass redistribution phenomena by time-dependent GRACE- and terrestrial gravity observations

Tackling mass redistribution phenomena by time-dependent GRACE- and terrestrial gravity observations

Evaluating local hydrological modelling by temporal gravity observations and a gravimetric three-dimensional model

An Analysis to Observations of the Superconducting Gravimeter at the Jiufeng Seismic Station, Wuhan

Contact Info

Product

Resources

About