GGM02 – An improved Earth gravity field model from GRACE

Tapley, Byron D; Ries, John; Bettadpur, Srinivas; Chambers, D. P.; Cheng, Minkang; Condi, F.; Gunter, B. C.; Kang, Z.; Nagel, Peter; Pastor, R.; Pekker, T.; Poole, S. R.; Wang, F.

doi:10.1007/s00190-005-0480-z

Cited by 582 publications

(419 citation statements)

References 12 publications

Supporting

Mentioning

408

Contrasting

Unclassified

Order By: Relevance

“…The first and second order derivatives of the disturbing potential T in the north oriented reference frame {x,y,z} are considered. We proceed from the known relation (Reed 1973) but we present it in terms of latitude instead of co-latitude:…”

Section: Gravity Gradients Componentsmentioning

confidence: 99%

See 2 more Smart Citations

EGMlab, a scientific software for determining the gravity and gradient components from global geopotential models

Kiamehr

Eshagh

2008

Earth Sci Inform

View full text Add to dashboard Cite

Nowadays, Global Geopotential Models (GGMs) are used as a routine stage in the procedures to compute a gravimetric geoid. The GGMs based geoidal height also can be used for GPS/levelling and navigation purposes in developing countries which do not have accurate gravimetric geoid models. Also, the GGM based gravity anomaly including the digital elevation model can be used in evaluation and outlier detections schemes of the ground gravity anomaly data. Further, the deflection of vertical and gravity gradients components from the GGMs can be used for different geodetic and geophysical interpretation purposes. However, still a complete and user-friendly software package is not available for universities and geosciences communities. In this article, first we review the procedure for determination of the basic gravity field and gradient components from the GGMs, then general MAT-LAB based software is presented and applied as a sample case study for determination of gravity components based on the most recent EIGEN-GL04C GRACE model in Sweden.

show abstract

Section: Gravity Gradients Componentsmentioning

confidence: 99%

“…The well-known models in this category are the GRACE satellite-only models GGM02S (Tapley et al 2005) and EIGEN-GL04S1 (Förste et al 2006).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

EGMlab, a scientific software for determining the gravity and gradient components from global geopotential models

Kiamehr

Eshagh

2008

Earth Sci Inform

View full text Add to dashboard Cite

show abstract

“…The major shortcomings have been the insufficient DTM resolution and the lack of dense gravity measurements over land. However, current interest in the geoid issue has been ignited by the development of high accuracy geopotential models derived from the most recent geopotential spatial missions CHAMP, GRACE, and GGM02C (Tapley et al, 2005), EIGEN (Förste et al, 2005;Förste et al, 2006), and the future GOCE mission (results from which should permit the geoid to be determined with unprecedented resolution and accuracy). In addition, good gravity coverage now exists over both land and sea, and a high resolution digital terrain model has been constructed, which now makes it possible to construct a high-quality gravity and geoid map for the Azores region.…”

Section: Page 4 Of 44mentioning

confidence: 99%

“…Based on GRACE data, a new generation of Earth geopotential gravity field models have been derived, namely EIGEN-GL04C (Förste et al, 2005(Förste et al, , 2006 and GGM02C (Tapley et al, 2005). EIGEN-GL04C is a combination of GRACE mission and Lageos mission data with the inclusion of altimetry and gravity surface data.…”

Section: The Geopotential Modelmentioning

confidence: 99%

Sensitivity analysis of the gravity geoid estimation: A case study on the Azores plateau

Catalão¹,

Bos²

2008

Physics of the Earth and Planetary Interiors

View full text Add to dashboard Cite

A numerical investigation into the effects of high-resolution heterogeneous data on the estimation of the geoid is presented for the area of the Azores plateau. Gravity data were complemented with highresolution digital terrain models, mass density models from geophysical information, and the most recent geopotential model from the CHAMP mission (GGM02) to derive a high-precision gravity model. Gravity data were reduced from the residual terrain model effects and the GGM02C model, and a grid with 1.5' spatial resolution was generated by least squares collocation. The gravimetric geoid model was computed by the direct evaluation of Stokes' integral with a spherical cap radius of 0.8 degree, with gravity data reduced by Helmert's second condensation method. The geoid model was evaluated over sea by comparison with six years of Topex/Poseidon altimeter data and an absolute agreement of 14 cm RMS was achieved after removing the bias. Over land, the geoid was compared with a total of 223 GPS/levelling points corresponding to five different vertical datums. Locally adjusted solutions were determined for each island with a four-parameter model, and a maximum RMS of 12 cm (on Pico) and a minimum of 2.1 cm (on Faial) were determined. As a result of persistent volcanic and tectonic activity on most of the Azores islands, this geoid residual standard deviation must not be viewed as purely geoid error but containing, in addition, levelling and GPS position errors and vertical displacement. The effect on geoid accuracy of the digital terrain model resolution, of the spatial density of gravity data, and of the mass density was evaluated and two important conclusions were derived. First, the digital terrain model resolution has a clear effect on the geoid accuracy, with a maximum RMS of 3.4 cm on S. Miguel. Second, the mass density model does not affect the accuracy of the geoid. This second result indicates that the effect of variable density Manuscript + tables + figuresPage 2 of 44 A c c e p t e d M a n u s c r i p t 2 models on geoid determination may apply only to extensive areas of high terrain and not to smaller topographic units such as single volcanoes. The high-precision gravity model and gravimetric geoid for Azores (AZGEOD07) generated in this study will allow the conversion of old orthometric heights to ellipsoidal heights at precisions useful for the monitoring of vertical deformation. The geoid will also have application to investigations of ocean circulation modulation and of dynamic processes of Earth's mantle.

show abstract

Asthenospheric Pacific‐Atlantic flow barriers and the West Scotia Ridge extinction

Martos

Galindo-Zaldı́var

Catalán

et al. 2014

Geophysical Research Letters

View full text Add to dashboard Cite

The Drake Passage is considered a gateway for oceanic and asthenospheric flows since its opening, entailing widespread consequences for climate and plate tectonics, respectively. Both the surface and the 50 km upward continued Bouguer anomaly maps of the Scotia Sea and surrounding areas, based on Gravity Recovery and Climate Experiment gravity satellite data, improve our knowledge of deep lithospheric structures and the asthenosphere. We show that the West Scotia Sea is likely to be underlain by an anomalously low‐density upper mantle. Gravity data are compatible with variable lithospheric thicknesses related to asthenospheric currents. The new data suggest that the development of the Shackleton Fracture Zone since the middle Miocene was probably a main factor that determined the evolution of the eastward Pacific mantle flows and the extinction of the West Scotia Sea oceanic spreading around 6 Ma ago. Deep lithospheric roots are likely to divert asthenospheric currents around them, flowing eastward through Drake Passage.

show abstract

GGM02 – An improved Earth gravity field model from GRACE

Cited by 582 publications

References 12 publications

EGMlab, a scientific software for determining the gravity and gradient components from global geopotential models

EGMlab, a scientific software for determining the gravity and gradient components from global geopotential models

Sensitivity analysis of the gravity geoid estimation: A case study on the Azores plateau

Asthenospheric Pacific‐Atlantic flow barriers and the West Scotia Ridge extinction

Contact Info

Product

Resources

About