Julien Aubert, CNRS, IPG Paris

I am a CNRS senior researcher working at the Institut de Physique du Globe de Paris (IPGP), within the Geological Fluid Dynamics team. 


I am interested in the interpretation of the geomagnetic signal emanating from Earth’s liquid outer core. Over a broad range of space and time scales, this signal is a powerful probe for investigating the structure, dynamics and geological history of our planet. Understanding the geodynamo is an outstanding fundamental challenge of Physical Sciences as well as Earth Sciences. 


To this end I develop and use direct numerical computer simulations of the dynamo process, as well as data assimilation algorithms aiming at forecasting the future evolution of the geomagnetic field. This has important societal impacts as the geomagnetic field interacts with life on Earth and with human technological activities.

News

05/02/2021

The exploration of the path in parameter space to Earth’s core continues, and the next stop is at 71 percent along the road. 246 million simulation time steps and 15 million CPU hours spent over the course of two years were necessary to complete this new model, where we explore the coexistence and interaction of slow convection and rapid hydromagnetic waves in Earth’s core.


This paper has been published in Geophysical Journal International.


Aubert, J., Gillet, N.: The interplay of fast waves and slow convection in geodynamo simulations nearing Earth's core conditions, in press, Geophys. J. Int., 2021, doi: 10.1093/gji/ggab054

23/11/2020

Congratulations to Dr. Tobias Schwaiger for a great PhD. defense, reflecting a great manuscript and work. Tobias has been supervised by Thomas Gastine and myself. He systematically studied the force balance in numerical dynamos throughout the accessible parameter space, and the links between the length scales of the solution and this force balance. Two papers have been published from this work:


Schwaiger, T., Gastine, T. and Aubert, J.: Relating force balances and flow length scales in geodynamo simulations, Geophys. J. Int., 2020, doi: 10.1093/gji/ggaa545.


Schwaiger, T., Gastine, T., Aubert, J.: Force balance in numerical geodynamo simulations: a systematic study, Geophys. J. Int 219 S1, S101-S114, 2019, doi: 10.1093/gji/ggz192.


Congrats Tobias!





PhD. defense of Tobias Schwaier, november 23 2020