| Title | New possibilities for gravity modeling using data of the CHAMP and GRACE satellites |
| Author | Kaban, M.K.; Reigber, C. |
| Author Affil | Kaban, M.K., Russian Academy of Sciences, Schmidt Institute of Physics of the Earth, Moscow, Russian Federation. Other: GeoForschungsZentrum, Federal Republic of Germany |
| Source | Izvestiya - Russian Academy of Sciences. Physics of the Solid Earth, 41(11), p.950-957, . Publisher: MAIK Nauka/Interperiodica, Birmingham, AL, United States. ISSN: 1069-3513 |
| Publication Date | Nov. 2005 |
| Notes | In English. 21 refs. GeoRef Acc. No: 287534. CRREL Acc. No: 63000270 |
| Index Terms | Earth crust; density (mass/volume); gravity anomalies; gravity; mathematical models; remote sensing; Antarctica; Bouguer anomalies; CHAMP; crust; density; GRACE; gravity field; heterogeneity; lithosphere; mantle; satellite methods; spherical harmonic analysis; upper mantle |
| Abstract | New global models of the gravity field derived from data of the CHAMP and GRACE satellites are described. These models open new possibilities for the study of density inhomogeneities and tectonics of the Earth. A uniform (for the entire planet) distribution of the gravitational potential and gravity up to the 120th spherical harmonic is obtained for the first time. The possibilities for using the new gravity field models are demonstrated with the example of Antarctica, where the greatest advances have been made compared to old models. Corrections of the gravity field reach ±70 mGal in some places of the continent. The new data are used to extract a gravity component that is due to deformations of the lithosphere in response to the ice load. The compensation for this load is shown to be essentially different for structures of different sizes. An excessive compensation of large-scale features of the ice sheet confirms that the lithosphere has not yet accommodated the recent change in the thickness of Antarctica's ice cover. Smaller features of the ice cover are compensated regionally by quasi-elastic deformations of the lithosphere. Thus, the new gravity models open great possibilities for modeling not only the structure of the lithosphere and the upper mantle but also its dynamics. |
| Publication Type | journal article |
| Record ID | 84740 |