Dynamics of the Earth, planets and exoplanets: Applications of numerical modelling to the geomagnetic field, planetary dynamos and planetary atmospheres

行星体的演化和动力学是由热流、行星旋转时的流体运动和电导率足够高的电磁控制的。我建议在行星流体动力学的三个主要领域开展研究，解决类地行星和巨行星的一系列基本问题：类地行星发电机（水星、地球和早期火星）的动力学，重点是地核及其磁场在多个时间尺度上的演变；漩涡、纬向流以及木星、土星、天王星和海王星的深层动力之间的相互作用；以及太阳系外行星中纬向流和发电机作用的相互作用，重点关注木星大小的天体，它们的轨道相对靠近它们的母恒星。本研究计划涉及深层流动和对流的理论和数值模拟，以及全球磁场的产生。我们持续的目标是促进理解和解决当前地球和行星动力学的科学问题。这导致了在《自然》、《自然地球科学》、《地球物理研究快报》、《天体物理学杂志》等多种期刊上发表的主要论文，这些论文促进了对太阳系若干行星，特别是水星、地球、木星、土星、天王星和海王星以及系外行星的动态演化的理解。

The evolution and dynamics of planetary bodies are governed by heat flow, fluid motions in the presence of planetary rotation, and electromagnetism where the electrical conductivity is sufficiently high. I propose to carry out research in three main areas of planetary fluid dynamics, addressing a range of fundamental questions for terrestrial and giant planets: dynamics of the terrestrial planet dynamos (Mercury, Earth and early Mars), focussing on Earth's core and evolution of its magnetic field over multiple timescales; interaction of vortices, zonal flows, and the deeper dynamos of Jupiter, Saturn, Uranus and Neptune; and interaction of zonal flow and dynamo action in extrasolar planets, with focus on Jupiter-sized bodies in orbits relatively close to their parent star. This research program involves theoretical and numerical modelling of deep flow and convection, and generation of global magnetic fields. Our ongoing goal is to advance understanding and solve current scientific problems in Earth and planetary dynamics. This has resulted in major papers published in a diversity of journals such as Nature, Nature Geoscience, Geophysical Research Letters, Astrophysical Journal, and others, that advance the understanding of the dynamical evolution of several of the solar system planets, particularly Mercury, Earth, Jupiter, Saturn, Uranus and Neptune, as well as exoplanets. Much of this research program benefits from collaborations with local and global partners: 1. Dynamics of Planetary Interiors. Primary collaborators and institutes: Computational Infrastructure for Geodynamics (CIG), Professor Jonathan Aurnou at UCLA, USA, Professor Johannes Wicht at the MPI for Solar System research, Germany, and Thomas Gastine at the Institute de Physique du Globe, in France. These collaborations involve theoretical and numerical modelling of fluid dynamics and magnetohydrodynamics applied to planetary atmospheres and interiors. Applications include the generation of Mercury's global magnetic field via dynamo action, and the dynamical relationship between zonal flows and deeper dynamos in giant planets. 2. Collaboration with Michael (Ted) Evans (U of A) and Lauri Pesonen (Helsinki) combines 3D numerical models of the geodynamo with observations of the Earth's magnetic field over various timescales. We use observational data sets, which include a variety of sources such as satellite data, navigational and other historical measurements, archeomagnetic and lake bed sedimentary data. For longer term observations we use paleomagnetic data. 3. All of these projects are supported by NSERC and by Compute Canada, which provides the use of shared and distributed memory supercomputers. The collaboration with CIG and Jonathan Aurnou is additionally supported by the USA Argonne National Laboratory computing facility.