Influence of Mantle Compressibility and Ocean Warping On Dynamical Models of the Geoid

SUMMARY The influence of mantle compressibility and warping of the ocean surface on dynamical models of the geoid has been investigated. Topography and geoid kernels show that compressibility modifies the mantle-flow pattern and hence the geoid, whereas the deflection of the oceanic surface amplifies the geoid signal without affecting the global flow. the combined influence of these two effects is significant and depends on the viscosity profile in the mantle. Comparisons with incompressible dynamical geoids show that including the effects of compressibility and ocean warping improves the fit to the observed geoid. Thus these effects must not be neglected in dynamical computations of the geoid.

[1]  Ulrich R. Christensen,et al.  Some effects of lateral viscosity variations on geoid and surface velocities induced by density anomalies in the mantle , 1993 .

[2]  Guy Masters,et al.  An inversion for radial viscosity structure using seismic tomography , 1992 .

[3]  W. L. Jones,et al.  Large‐scale waves in the upper‐mesosphere at Antarctic high‐latitudes , 1992 .

[4]  R. Peltier,et al.  Viscous flow models of global geophysical observables: 1. Forward problems , 1991 .

[5]  Wei-jia Su,et al.  Predominance of long-wavelength heterogeneity in the mantle , 1991, Nature.

[6]  T. Tanimoto.  Long-wavelength S-wave velocity structure throughout the mantle , 1990 .

[7]  C. Vigny,et al.  Mantle dynamics with induced plate tectonics , 1989 .

[8]  R. Boehler,et al.  Thermal expansion measurements at very high pressure, systematics, and a case for a chemically homog , 1989 .

[9]  C. Vigny,et al.  Mantle heterogeneities, geoid, and plate motion: A Monte Carlo inversion , 1989 .

[10]  C. Vigny.  Géoïde et dynamique interne de la Terre , 1989 .

[11]  Robert W. Clayton,et al.  Constraints on the Structure of Mantle Convection Using Seismic Observations, Flow Models, and the Geoid , 1989 .

[12]  W. Peltier,et al.  Plate tectonics and aspherical earth structure: The Importance of poloidal‐toroidal coupling , 1987 .

[13]  Robert W. Clayton,et al.  Lower mantle heterogeneity, dynamic topography and the geoid , 1985, Nature.

[14]  John H. Woodhouse,et al.  Mapping the upper mantle: Three‐dimensional modeling of earth structure by inversion of seismic waveforms , 1984 .

[15]  Adam M. Dziewonski,et al.  Mapping the lower mantle: Determination of lateral heterogeneity in P velocity up to degree and order 6 , 1984 .

[16]  B. Hager,et al.  Geoid Anomalies in a Dynamic Earth , 1984 .

[17]  C. Froidevaux,et al.  Geoid heights and lithospheric stresses for a dynamic Earth. , 1984 .

[18]  B. Parsons,et al.  The relationship between surface topography, gravity anomalies, and temperature structure of convection , 1983 .

[19]  D. L. Anderson,et al.  Preliminary reference earth model , 1981 .