New ultrahigh-resolution picture of Earth's gravity field
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An edited version of this paper was published by AGU. Copyright (2013) American Geophysical Union.
We provide an unprecedented ultrahigh resolution picture of Earth’s gravity over all continents and numerous islands within ±60° latitude. This is achieved through augmentation of new satellite and terrestrial gravity with topography data and use of massive parallel computation techniques, delivering local detail at ~200 m spatial resolution. As such, our work is the first-of-its-kind to model gravity at unprecedented fine scales yet with near-global coverage. The new picture of Earth’s gravity encompasses a suite of gridded estimates of gravity accelerations, radial and horizontal field components, and quasi-geoid heights at over 3 billion points covering 80% of Earth’s land masses. We identify new candidate locations of extreme gravity signals, suggesting that the Committee on Data for Science and Technology standard for peak-to-peak variations in free-fall gravity is too low by about 40%. The new models are beneficial for a wide range of scientific and engineering applications and freely available to the public.
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Hirt, Christian; Rexer, M.; Claessens, Sten (2015)ESA (European Space Agency) has released a series of new-generation Earth gravity field models computed from gradiometry and GPS observations carried out aboard the GOCE (Gravity field and Ocean Circulation Explorer) ...
Hirt, Christian; Kuhn, Michael; Claessens, Sten; Pail, R.; Seitz, K.; Gruber, T. (2014)This paper describes the computation and analysis of the Earth’s short-scale gravity field through high-resolution gravity forward modelling using the Shuttle Radar Topography Mission (SRTM) global topography model. We ...
Hirt, Christian; Kuhn, Michael ; Claessens, Sten ; Pail, R.; Seitz, K.; Gruber, T. (2014)This paper describes the computation and analysis of the Earth?s short-scale gravity field through high-resolution gravity forward modelling using the Shuttle Radar Topography Mission (SRTM) global topography model. We ...