ESA's satellite‐only gravity field model via the direct approach based on all GOCE data

Bruinsma, Sean; Förste, Christoph; Abrikosov, O. A.; Lemoine, Jean‐Michel; Marty, Jean‐Charles; Mulet, Sandrine; Rio, Marie-Hélène; Bonvalot, Sylvain

doi:10.1002/2014gl062045

Cited by 136 publications

(101 citation statements)

References 12 publications

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“…For the geoid model, DIR5 has an estimated accuracy of 1.7 cm around 100 km half-wavelength (degree 200) (Bruinsma et al 2014). However, in order to obtain the higher spatial resolution for 'DIR5 (Extended)', we have relied on the addition of coefficients from EGM08 to degree 2190.…”

Section: Mdt From Altimetry Minus Geoidmentioning

confidence: 99%

“…However, the publication of the GOCE-only 'Release 5' models of the European Space Agency (ESA), the latest in this series of geoid models, provides an opportunity to perform an up-to-date Mediterranean assessment. For the present work, we have made most use of the 'Direct' version of these Release 5 models that we denote DIR5, which has been confirmed to represent the geoid signal without significant attenuation up to degree 220 by means of comparison of root-mean-square geoid differences at GPS/levelling points (Bruinsma et al 2014;Gruber 2014; see also Gruber et al 2011 for similar comparisons with earlier geoid models). We have also made use of a selection of earlier geoid models.…”

Section: Introductionmentioning

confidence: 99%

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The status of measurement of the Mediterranean mean dynamic topography by geodetic techniques

Woodworth

Gravelle

Marcos

et al. 2015

J Geod

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We review the measurement of the mean dynamic topography (MDT) of the Mediterranean using ellipsoidal heights of sea level at discrete tide gauge locations, and across the entire basin using satellite altimetry, subtracting estimates of the geoid obtained from recent models. This 'geodetic approach' to the determination of the MDT can be compared to the independent 'ocean approach' that involves the use of in situ oceanographic measurements and ocean modelling. We demonstrate that with modern geoid and ocean models there is an encouraging level of consistency between the two sets of MDTs. In addition, we show how important geodetic MDT information can be in judging between existing global ocean circulation models, and in providing insight for the development of new ones. The review makes clear the major limitations in Mediterranean data sets that prevent a more complete validation, including the need for improved geoid models of high spatial resolution and accuracy. Suggestions are made on how a greater amount of reliable geo-located tide gauge information can be obtained in the future. IntroductionThis paper discusses the mean dynamic topography (MDT) of the Mediterranean and its measurement by geodetic techniques. The MDT is the amount by which the Mean Sea Surface (MSS) is further from the centre of the Earth than a surface called the geoid, which is an equipotential surface resulting from the Earth's spatially-varying gravity field, and which would correspond to the MSS in the absence of an ocean circulation. An accurate measurement of the MDT can, therefore, provide oceanographers with insight into the circulation. Conversely, knowledge of the circulation, obtained by a number of oceanographic techniques can be used to infer the MDT. 2Much is already known about the mean circulation of the Mediterranean and its variability (e.g. Pinardi and Masetti 2000) and, therefore, also about the spatial variation of its MDT. This insight has largely been obtained using in situ oceanographic measurements and ocean modelling. However, in recent years major advances have been made in geodetic techniques that have enabled the MDT to be determined, for the first time, as the difference between MSS and geoid to the accuracy required for oceanographic research (e.g. Bingham et al. 2014). These techniques have primarily involved satellite altimetry to provide the MSS over the open ocean and space gravity to provide the geoid, complemented at the coast with the use of tide gauges equipped with Global Positioning System (GPS) equipment (Woodworth et al. 2012). By studying the Mediterranean, particular lessons can be learned in the use of these techniques, notably by pointing to missing infrastructure and data limitations, which can also be relevant to discussion of the MDT in other data-sparse regions around the world.Models of the MDT in the Mediterranean have already been made by previous authors in various ways (e.g. Rio et al. 2014a). Consequently, the present paper focuses on reviewing how an MDT model can be compa...

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Section: Mdt From Altimetry Minus Geoidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The status of measurement of the Mediterranean mean dynamic topography by geodetic techniques

Woodworth

Gravelle

Marcos

et al. 2015

J Geod

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“…However, measurements of the gravity gradient tensor by GOCE have now been used to determine the gravity potential coefficients to degree and order (d/o) 300. The resolution of this new gravity model is considerably better than that used by M c Kenzie et al (2014) because it incoporates data from the end of the GOCE mission when the orbital height was reduced to about 224 km (Bruinsma et al 2014). The new gravity model DIR-R5 now allows T e to be estimated in all continental regions where there is sufficient topography.…”

Section: Introductionmentioning

confidence: 99%

Estimates ofTefor continental regions using GOCE gravity

McKenzie

Rummel

2015

Earth and Planetary Science Letters

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“…The aim of this paper is to provide a map of crustal thickness variations of the Antarctica continent based on the most recent combined space gravity field, named DIR5 (Bruinsma et al, 2014). We postulate that subsurface contributions can be properly removed using BEDMAP1 grids to compute the Moho topography.…”

mentioning

confidence: 99%

“…Data from GOCE (gravity gradients), LAGEOS 1/2 and GRACE were combined in the last release DIR5 (Bruinsma et al, 2014) in order to obtain a high accuracy gravity field model over the entire spectral range. This model is provided in terms of spherical harmonics up to degree 300, but was used in this study to degree 260, i.e.…”

mentioning

confidence: 99%

Crustal Thickness of Antarctica estimated using data from gravimetric satellites

Llubes¹,

Seoane²,

Bruinsma³

et al. 2017

Preprint

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Abstract. Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this far continentwhere almost all the rocky surface is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution 10 for geological and geophysical purposes. Here, we computed a global map of Antarctic crustal thicknesses based on space gravity observations. The DIR5 gravity field model, built from GOCE and also GRACE gravimetric data, is inverted with the Parker-Oldenburg's iterative algorithm. The BEDMAP products are used to estimate the gravity effect of the ice and the rocky surface. Our result is compared to crustal thickness provided by seismological studies, CRUST1.0 and AN1 models. Although CRUST1.0 shows a very good agreement with our model, the spatial resolution is smaller with gravimetric data. Finally, we 15 adjust the crust/mantle density contrast considering the Moho depth from CRUST1.0 model. In East Antarctica, the density contrast clearly shows higher values than in West Antarctica.

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ESA's satellite‐only gravity field model via the direct approach based on all GOCE data

Cited by 136 publications

References 12 publications

The status of measurement of the Mediterranean mean dynamic topography by geodetic techniques

The status of measurement of the Mediterranean mean dynamic topography by geodetic techniques

Estimates ofTefor continental regions using GOCE gravity

Crustal Thickness of Antarctica estimated using data from gravimetric satellites

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