Regional geoid of the Weddell Sea, Antarctica, from heterogeneous ground-based gravity data

Schwabe, Joachim; Scheinert, Mirko

doi:10.1007/s00190-014-0724-x

Cited by 11 publications

(8 citation statements)

References 40 publications

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“…In this way, systematic effects are accounted for, e.g., biases originating from different gravity datum realizations. This simple ansatz gives comparable results to a more complex computation using least squares estimation including the estimation of offsets as realized by Schwabe and Scheinert []. Considerable offsets of up to 40mGal were detected.…”

Section: Derivation Of a New Antarctic Gravity Anomaly Gridmentioning

confidence: 56%

“…However, as discussed in section 2, Antarctic gravity data exhibit large heterogeneities and inconsistencies. How heterogeneous gravity data can be utilized to improve the regional geoid has previously been presented for the Weddell Sea [ Schwabe and Scheinert , ] and Lake Vostok [ Schwabe et al , ]. The application of a background EGM is a major step of the RCR technique (see section 5.2).…”

Section: Regional Gravity Field Determination In Antarctica and Choicmentioning

confidence: 99%

“…In some cases it could be deduced from the metadata. If no information was available, we utilized precomparisons like cross‐over computations or previous investigations incorporating independent data, see, e.g., Schwabe and Scheinert []. Thus, a standard value of 3mGal was allocated to airborne gravity surveys where no other value was given.…”

Section: Derivation Of a New Antarctic Gravity Anomaly Gridmentioning

confidence: 99%

“…The PMGE/VNIIO compilation #26 was assigned a value of 10mGal since the data were mostly acquired before GNSS positioning became available. Also, due to unknown smoothing and gridding procedure this data set exhibits a lower spatial resolution of about 25 to 30km and biases of up to 25mGal (see also Studinger [] and Schwabe and Scheinert []).…”

Section: Derivation Of a New Antarctic Gravity Anomaly Gridmentioning

confidence: 99%

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New Antarctic gravity anomaly grid for enhanced geodetic and geophysical studies in Antarctica

Scheinert

Ferraccioli

Schwabe

et al. 2016

Geophysical Research Letters

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Gravity surveying is challenging in Antarctica because of its hostile environment and inaccessibility. Nevertheless, many ground‐based, airborne, and shipborne gravity campaigns have been completed by the geophysical and geodetic communities since the 1980s. We present the first modern Antarctic‐wide gravity data compilation derived from 13 million data points covering an area of 10 million km2, which corresponds to 73% coverage of the continent. The remove‐compute‐restore technique was applied for gridding, which facilitated leveling of the different gravity data sets with respect to an Earth gravity model derived from satellite data alone. The resulting free‐air and Bouguer gravity anomaly grids of 10 km resolution are publicly available. These grids will enable new high‐resolution combined Earth gravity models to be derived and represent a major step forward toward solving the geodetic polar data gap problem. They provide a new tool to investigate continental‐scale lithospheric structure and geological evolution of Antarctica.

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Section: Derivation Of a New Antarctic Gravity Anomaly Gridmentioning

confidence: 56%

Section: Regional Gravity Field Determination In Antarctica and Choicmentioning

confidence: 99%

Section: Derivation Of a New Antarctic Gravity Anomaly Gridmentioning

confidence: 99%

Section: Derivation Of a New Antarctic Gravity Anomaly Gridmentioning

confidence: 99%

See 2 more Smart Citations

New Antarctic gravity anomaly grid for enhanced geodetic and geophysical studies in Antarctica

Scheinert

Ferraccioli

Schwabe

et al. 2016

Geophysical Research Letters

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“…Despite the tremendous progresses made in global geopotential model computation over decades, the lack of globally distributed gravity data is still a major barrier to improve the combined GGMs. For regions inland, such as most areas in Asia and Africa, the measured land/airborne gravimetric observations are limited; accessible and fill-in measurements were involved in the computation of combined GGMs [9,12,13], whereas satellite altimetric gravity data was usually used over oceans as shipborne/airborne gravimetric measurements were usually inaccessible or confidentially kept due to political reasons [14]. However, the satellite altimeter-derived data is notoriously known to be of low quality close to land/island, owing to the contamination of radar altimeter waveforms and degraded quality of geophysical models used for data corrections [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Local Enhancement of Marine Gravity Field over the Spratly Islands by Combining Satellite SAR Altimeter-Derived Gravity Data

Wang

Abulaitijiang

et al. 2022

Remote Sensing

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The marine gravity field recovery close to land/island is challenging owing to the scarcity of measured gravimetric observations and sorely contaminated satellite radar altimeter-derived data. The satellite missions that carried the synthetic aperture radar (SAR) altimeters supplied data with improved quality compared to that retrieved from the conventional radar altimeters. In this study, we combine the satellite altimeter-derived gravity data for marine gravity field augmentation over island areas; in particular, the feasibility for regional augmentation by incorporating the SAR altimeter-derived gravity data is investigated. The gravity field modeling results over the Spratly Islands demonstrate that the marine gravity field is augmented by the incorporation of newly published satellite altimeter-derived gravity data. By merging the gravity models computed with the Sentinel-3A/B SAR altimetry data, the quasi-geoid and mean dynamic topography are dramatically improved, by a magnitude larger than 4 cm around areas close to islands, in comparison with the results directly derived from a combined global geopotential model alone. Further comparison of regional solutions computed from heterogeneous gravity models shows that the ones modeled from the SAR-based gravity models have better performances, the errors of which are reduced by a magnitude of 2~4 cm over the regions close to islands, in comparison with the solutions modeled with the gravity models developed without SAR altimetry data. These results highlight the superiority of using the SAR-based gravity data in marine gravity field recovery, especially over the regions close to land/island.

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Geodesy in Polar Regions

Scheinert¹,

Horwath²,

Dietrich³

et al. 2014

Encyclopedia of Geodesy

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Regional geoid of the Weddell Sea, Antarctica, from heterogeneous ground-based gravity data

Cited by 11 publications

References 40 publications

New Antarctic gravity anomaly grid for enhanced geodetic and geophysical studies in Antarctica

New Antarctic gravity anomaly grid for enhanced geodetic and geophysical studies in Antarctica

Local Enhancement of Marine Gravity Field over the Spratly Islands by Combining Satellite SAR Altimeter-Derived Gravity Data

Geodesy in Polar Regions

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