Loading effect of a self-consistent equilibrium ocean pole tide on the gravimetric parameters of the gravity pole tides at superconducting gravimeter stations

Chen, Xiaodong; Ducarme, B.; Sun, Heping; Xu, Jun

doi:10.1016/j.jog.2007.11.003

Cited by 5 publications

(6 citation statements)

References 32 publications

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“…The latter paper showed that predictions of the OMCT model for station MO gave variations of 0.5-1.0 μGal, but these do not correlate well enough with the observed SG series to significantly reduce the residual gravity. The ocean pole tide and LOD variations are at the level of about 0.15 μGal (Chen et al 2008(Chen et al , 2009, and small compared to the seasonal effects here. The secular change in gravity over Europe is ignored here as all mean fields are removed.…”

Section: Effects Not Includedcontrasting

confidence: 52%

A comparison of the gravity field over Central Europe from superconducting gravimeters, GRACE and global hydrological models, using EOF analysis

Crossley

Linage

Hinderer

et al. 2012

Geophysical Journal International

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SUMMARY We analyse data from seven superconducting gravimeter (SG) stations in Europe from 2002 to 2007 from the Global Geodynamics Project (GGP) and compare seasonal variations with data from GRACE and several global hydrological models—GLDAS, WGHM and ERA‐Interim. Our technique is empirical orthogonal function (EOF) decomposition of the fields that allows for the inherent incompatibility of length scales between ground and satellite observations. GGP stations below the ground surface pose a problem because part of the attraction from soil moisture comes from above the gravimeter, and this gives rise to a complex (mixed) gravity response. The first principle component (PC) of the EOF decomposition is the main indicator for comparing the fields, although for some of the series it accounts for only about 50 per cent of the variance reduction. PCs for GRACE solutions RL04 from CSR and GFZ are filtered with a cosine taper (degrees 20–40) and a Gaussian window (350 km). Significant differences are evident between GRACE solutions from different groups and filters, though they all agree reasonably well with the global hydrological models for the predominantly seasonal signal. We estimate the first PC at 10‐d sampling to be accurate to 1 μGal for GGP data, 1.5 μGal for GRACE data and 1 μGal between the three global hydrological models. Within these limits the CNES/GRGS solution and ground GGP data agree at the 79 per cent level, and better when the GGP solution is restricted to the three above‐ground stations. The major limitation on the GGP side comes from the water mass distribution surrounding the underground instruments that leads to a complex gravity effect. To solve this we propose a method for correcting the SG residual gravity series for the effects of soil moisture above the station.

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Section: Effects Not Includedcontrasting

confidence: 52%

A comparison of the gravity field over Central Europe from superconducting gravimeters, GRACE and global hydrological models, using EOF analysis

Crossley

Linage

Hinderer

et al. 2012

Geophysical Journal International

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“…For the remaining parts of the Earth's surface the reduction is based on surface pressure (Merriam, 1992), which is used as well for the reduction of the atmospheric loading. Not applied up to now are reductions with respect to the nontidal ocean mass redistribution, which are presently suffering from uncertainties due to a rough grid , and the ocean pole tide effect, which is with < 2 nm/s² at European SG sites smaller than the uncertainties of other long-period signals (Chen et al, 2008). …”

Section: Reductions For the Consistent Combination Of Gravity Time Sementioning

confidence: 99%

Gravity field variations from superconducting gravimeters for GRACE validation

Weise

Kröner

Abe

et al. 2009

Journal of Geodynamics

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The network of superconducting gravimeters (SG) of the 'Global Geodynamics Project' (GGP) offers the unique opportunity to supplement and validate the gravity field variations derived from the GRACE satellite mission. Because of the different spatial and temporal resolution of the gravity data a combination of all data sets can be used to retrieve a maximum of information regarding mass transfers especially related to hydrology which is deployable as constraint for hydrological modelling.For a consistent combination of the data sets the gap between terrestrial data of superconducting and absolute gravimeters (AG) and from satellite data has to be bridged.A successful combination of SG and AG data could be realized for several stations which resulted in time series of highest accuracy and long-term stability.In principle, the same reductions applied to GRACE data have to be taken into account for the terrestrial data. The separation of local hydrological effects in SG observations is crucial for the comparison with satellite-derived gravity data. It is shown that even for stations with a hydrological challenging situation such as Moxa/Germany local hydrology-induced effects can be successfully modelled.* corresponding author, phone: +49-3641-948609, fax: +49-3641-948662, email:Adelheid.Weise@uni-jena.dePage 2 of 21A c c e p t e d M a n u s c r i p tCurrently, the study focuses on Europe with its dense and long-term observation network. Regarding the consistency of the SG gravity variations they are representative for a larger region. From a comparison with GRACE-derived gravity field changes, and the variations due to hydrological models a principle good agreement emerges.

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“…A self-consistent equilibrium ocean pole tide is used to compute the gravity effect induced by ocean pole tide (Desai, 2002;Chen et al, 2006Chen et al, , 2008. The time series of gravity effect of a self-consistent equilibrium ocean pole tide at station BH is shown in Fig.…”

Section: Gravity Effect Of a Self-consistent Ocean Pole Tidementioning

confidence: 99%

“…5B. Influence of a self-consistent equilibrium ocean pole tide can account for at least 1% of the theoretical gravimetric factor of gravity pole tide (Chen et al, 2008). Therefore, this effect should be considered in the estimation of gravimetric factor of gravity pole tide using SG data.…”

Section: Gravity Effect Of a Self-consistent Ocean Pole Tidementioning

confidence: 99%

Determination of gravimetric parameters of the gravity pole tide using observations recorded with superconducting gravimeters

Chen

Kröner

Sun

et al. 2009

Journal of Geodynamics

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Loading effect of a self-consistent equilibrium ocean pole tide on the gravimetric parameters of the gravity pole tides at superconducting gravimeter stations

Cited by 5 publications

References 32 publications

A comparison of the gravity field over Central Europe from superconducting gravimeters, GRACE and global hydrological models, using EOF analysis

A comparison of the gravity field over Central Europe from superconducting gravimeters, GRACE and global hydrological models, using EOF analysis

Gravity field variations from superconducting gravimeters for GRACE validation

Determination of gravimetric parameters of the gravity pole tide using observations recorded with superconducting gravimeters

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