Jonathan Mound von der University of Leeds präsentiert seine Forschung in einem Vortrag mit dem Titel "Regional differences in heterogeneous thermochemical geodynamo simulations". Der Vortrag findet auf englischer Sprache statt.
Co-Host ist dieses Mal tba.
Das DeepDyn Seminar findet online als zoom-meeting statt. DeepDyn Mitglieder erhalten den Zuganglink automatisch vor dem Seminar. Wir bitten externe Seminargäste sich für das Seminar zu registrieren, um den Zugangslink zu erhalten.
Regional differences in heterogeneous thermochemical geodynamo simulations
© Jon Mound
Abstract
As the core loses heat to the mantle, the inner core solidifies releasing both latent heat and light elements into the overlying fluid. This drives thermochemical convection that powers the geodynamo. We have performed numerical simulations of that convection, considering both the different diffusivities of the chemical and thermal components, and the different chemical and thermal boundary conditions that the mantle imposes on the core. Regions with inverted density gradients that suppress convection at the top of the core form in these simulations, due to both compositional and thermal effects. These regional inversion lenses (RILs) are ubiquitous across a wide range of parameter space. Compositional RILs tend to form in polar regions, whereas thermal RILs form beneath the (hot) Large Low Velocity Provinces in the mantle. If they are sufficiently strong and thick, these RILs could have magnetic or seismic signatures.
Link zum nächsten Seminarvortrag
mit Carsten Münker (Universität zu Köln)
title tba