Mathieu Dumberry

Gravitational torque drives multidecadal variations in length of day

Multidecadal fluctuations in Earth’s length of day are shown to be driven by gravitational torque and resisted by electromagnetic and topographic forces, improving our understanding of the material properties and dynamics of Earth’s deep interior.

The core-mantle mode of gravitational oscillation

We present the characteristics of a mode of axial oscillation between Earth's mantle, fluid core and solid inner core that has not been previously reported. The mode involves a quasi-rigid rotation of the fluid core outside the tangent cylinder (TC) exchanging its angular momentu...