Scheinert, Mirko; Ferraccioli, Fausto; Schwabe, Joachim; Bell, Robin E; Studinger, Michael; Damaske, Detlef; Jokat, Wilfried; Aleshkova, Nadezhda D; Jordan, Tom A; Leitchenkov, German L; Blankenship, Donald D; Damiani, Theresa; Young, Duncan A; Cochran, James R; Richter, Thomas (2016): Antarctic free-air and complete Bouguer gravity anomaly grid. PANGAEA, https://doi.org/10.1594/PANGAEA.848168, Supplement to: Scheinert, M et al. (2016): New Antarctic gravity anomaly grid for enhanced geodetic and geophysical studies in Antarctica. Geophysical Research Letters, 43(2), 600-610, https://doi.org/10.1002/2015GL067439
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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 km**2, 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.
Median Latitude: -66.937968 * Median Longitude: 0.134730 * South-bound Latitude: -90.000000 * West-bound Longitude: -179.827941 * North-bound Latitude: -48.498684 * East-bound Longitude: 180.000000
Resolution: 10 km; Coordinate system used in calculation: Polar Stereographic Projection; Ellipsoid: WGS84; Projection center: 90 degree South; True scale: 71 degree South; x_min: -3330 km, x_max: 3330 km; y_min: -3330 km, y_max: 3330 km
Surface heights (ellipsoidal and orthometric, resp.) are taken from Bedmap2 (Fretwell et al., 2013, doi:10.5194/tc-7-375-2013).
|#||Name||Short Name||Unit||Principal Investigator||Method/Device||Comment|
|1||x||x||Scheinert, Mirko||in km|
|2||y||y||Scheinert, Mirko||in km|
|5||Height above ellipsoid||H-Ell||m||Scheinert, Mirko||from Bedmap2 (Fretwell et al., 2013, doi:10.5194/tc-7-375-2013), (w.r.t. WGS84, geoid model: EIGEN-GL04C) in area north of 60 degree South set to 0.0 (corresponds to sea level)|
|6||Orthometric height||Ortho height||m||Scheinert, Mirko||from Bedmap2 (Fretwell et al., 2013, doi:10.5194/tc-7-375-2013), (w.r.t. WGS84, geoid model: EIGEN-GL04C) in area north of 60 degree South set to 0.0 (corresponds to sea level)|
|7||Free-air gravity anomaly||FAGA||mGal||Scheinert, Mirko|
|8||Accuracy||Accuracy||Scheinert, Mirko||given in mGal. RMS, propagated from a priori standard deviation|
|9||Bouguer anomaly||Bouguer||mGal||Scheinert, Mirko||complete Bouguer gravity anomaly|
2224256 data points