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Area of Science:

  • Geophysics
  • Computational physics
  • Earth sciences

Background:

  • Numerical dynamo simulations link field reversals to strong inertial effects.
  • Inertial forces are theoretically secondary in Earth's outer core dynamics.

Purpose of the Study:

  • Investigate the role of heterogeneous core-mantle boundary heat flux on geomagnetic reversals.
  • Reconcile numerical findings with theoretical expectations of inertial force importance.

Main Methods:

  • Utilized numerical dynamo simulations.
  • Incorporated heterogeneous outer boundary heat flux inferred from seismic data.
  • Analyzed the impact of varying heat flux heterogeneity amplitude.

Main Results:

  • Geomagnetic reversals occur with increased heat flux heterogeneity.
  • Reversals are triggered in high heat flux regions with strong small-scale inertial forces.
  • Increased heterogeneity leading to sub-adiabatic conditions suppresses reversals.

Conclusions:

  • Heterogeneous heat flux at the core-mantle boundary can drive geomagnetic reversals.
  • This reconciles the need for inertia in simulations with its secondary role in theory.
  • Geodynamo behavior exhibits non-monotonic responses to heat flux heterogeneity.