Fast seafloor topography mapping of large oceanic provinces by optimization/parallelization

• DOI: 10.5194/egusphere-egu24-9318
• Publication Date: 2024-03-08T19:51:51Z
• Authors: Lucia Seoane; David Fuseau; Guillaume Ramillien; José Darrozes; Bastien Plazolles; Didier Rouxel; Corinne Salaün; Thierry Schmitt
• Keywords: Seafloor Spreading

During the last decades, several inversion approaches have been proposed to derive sea floor topography from satellite-based gravity data. Unfortunately, most accurate non linear ones are based on iterative schemes that remain very time-consuming, especially if number of topographic heights be fitted is important, e.g. when oceanic domain large and/or data geographically dense and thus maximum grid resolution accessible high. Our strategy computation decompose total area into geographical cells overlapped cancel edge effects. The reference ocean depth given by GEBCO elastic thickness for regional compensation in function square root age crust assumed constant each cell. initial code has translated C++ optimized using Armadillo software LAPACK library obtain a gain speed 1000 region such as complete North Atlantic Ocean (-54,-26,18,37). Post-fit absolute errors typically less than 200 m 50 r.m.s. respectively. These new detailed maps bathymetry represent precious source information geophysical applications.