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Satellite gravity gradient grids for geophysics.

Johannes Bouman1, Jörg Ebbing2, Martin Fuchs1

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This summary is machine-generated.

The Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite provides gravity gradients. New grids reveal high-frequency content, improving geophysical modeling accuracy and applications.

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Area of Science:

  • Geophysics
  • Earth Science
  • Satellite Geodesy

Background:

  • The Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite was designed to map Earth's mean gravity field.
  • GOCE data provides gravity gradients, which are complex to interpret due to error characteristics and instrument frame relativity.
  • Utilizing gravity gradients requires advanced processing to extract meaningful geophysical information.

Purpose of the Study:

  • To compute and analyze gravity gradients from GOCE data at different altitudes.
  • To assess the potential for enhanced high-frequency content in computed gravity gradient grids.
  • To investigate the utility of GOCE gravity gradients for geophysical modeling and Earth science applications.

Main Methods:

  • Computation of gravity gradients in grids at 225 km and 255 km altitudes.
  • Comparison of computed grids with existing GOCE-based global models to identify high-frequency content.
  • Analysis of gradient sensitivity for crustal depth using a 3D lithospheric model of the North-East Atlantic region.

Main Results:

  • Computed gravity gradient grids at 225 km and 255 km altitudes may contain additional high-frequency content compared to GOCE global models.
  • Depth sensitivity analysis reveals that different gradient components provide varying sensitivity to crustal depths.
  • The relative signal power of individual gradient components changes between the 225 km and 255 km grids.

Conclusions:

  • Combining all gravity gradient components at different altitudes reduces parameter uncertainties in geophysical modeling.
  • GOCE gravity gradients offer complementary information to gravity data, valuable for diverse applications.
  • Potential applications include lithospheric modeling, dynamic topography studies, glacial isostatic adjustment, and bedrock geometry determination.