Cenozoic evolution of earth's strongest geoid low illuminates mantle dynamics beneath Antarctica.

ABSTRACT: Constraining the long-term evolution of geoid anomalies is essential for unraveling Earth's internal dynamics. While most studies focus on present-day geoid snapshots, we reconstruct the time-dependent evolution of Earth's strongest geoid depression, the Antarctic Geoid Low (AGL), over the Cenozoic. Unlike geodetic reference frames that place the deepest geoid low in the Indian Ocean, a geodynamic perspective - relative to a hydrostatic ellipsoid - reveals the strongest nonhydrostatic geoid depression resides over Antarctica. Using a back-and-forth nudging technique for time-reversed mantle convection modeling, we leverage 3-D mantle density structures derived from seismic tomography and geodynamic constraints. Our results show that the AGL has persisted for at least ~70 Myr, undergoing a

SUBMITTER: Glisovic P 

PROVIDER: S-EPMC12756311 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature