DI002
Assessing the Robustness of Models of Earth’s Deep Mantle and Core
Session ID#: 79843
Session Description:
Our views of Earth’s deep interior properties and processes have evolved over the past two decades. Investigations have produced complex models of heterogeneous deep interior structure. High PT experiments and simulations have constrained properties such as lower mantle thermal conductivity and partition coefficients. Satellite missions continue to map geomagnetic variations with unprecedented accuracy, while geodynamo simulations capture these variations with ever improving realism. These elements lead to increasingly detailed, yet sometimes conflicting geodynamic scenarios. Here we seek to discuss the confidence bounds of deep Earth models to determine which aspects of these models are robust and which need further investigation. Questions for this session include: how well are D’’ properties constrained? Are there stable layers above and below the outer core? How do CMB properties influence the core? What are the primary drivers of core flow? What bounds exist on the inner core’s age and seismic properties?
Index Terms:
1507 Core processes [GEOMAGNETISM AND PALEOMAGNETISM]
7207 Core [SEISMOLOGY]
7208 Mantle [SEISMOLOGY]
8124 Earth's interior: composition and state [TECTONOPHYSICS]
Primary Convener: Jonathan M Aurnou, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
Conveners: Julien Aubert, Institut de Physique du Globe, Paris, France and Jessica C E Irving, Princeton University, Department of Geosciences, Princeton, NJ, United States
Primary Liaison: Jonathan M Aurnou, University California, Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
The Signal of Outermost Core Stratification in Body Wave and Normal Mode Data (490636)
Rûna van Tent1, Arwen Fedora Deuss1, Satoshi Kaneshima2 and Christine Thomas3, (1)Utrecht University, Utrecht, Netherlands, (2)Kyushu University, Fukuoka, Japan, (3)University of Münster, Institute of Geophysics, Münster, Germany
South Sandwich to Alaska anomalous inner core phase observations explained by upper mantle slab effects beneath Alaska (492588)
Daniel Andrew Frost, Berkeley Seismological Lab, Berkeley, CA, United States, Barbara A Romanowicz, Univ California Berkeley, Berkeley, CA, United States and Steven W Roecker, Rensselaer Polytechnic Inst, Earth & Environmental Sciences, Troy, NY, United States
What Are LLSVPs? Geodynamic Insights into Lower Mantle Chemistry and Structure (Invited) (493497)
Fred Richards1,2, Mark J Hoggard1,3, Siavash Ghelichkhan4,5 and Harriet C. P. Lau1,6, (1)Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States, (2)Imperial College London, Earth Science and Engineering, London, United Kingdom, (3)Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (4)Ludwig Maximilians University of Munich, Munich, Germany, (5)Australian National University, Research School of Earth Sciences, Canberra, Australia, (6)University of California Berkeley, Berkeley, CA, United States
Turbulent Convective Lengthscale in Planetary Cores (Invited) (494561)
Philippe Cardin, ISTerre Institut des Sciences de la Terre, UGA - CNRS, Grenoble, France, Celine Guervilly, Newcastle University, Tyne and Wear, United Kingdom and Nathanaël Schaeffer, University Grenoble Alpes, ISTerre - CNRS/IRD, Grenoble, France
Constraints on Earth's Magnetic Field within a Stratified Layer (494633)
Colin Michael Hardy, University of Leeds, Leeds, LS2, United Kingdom, Philip W Livermore, School of Earth & Environment, Leeds, United Kingdom and Jitse Niesen, University of Leeds, Applied Mathematics, Leeds, United Kingdom
Separate regime transitions for heat and momentum transport in laboratory-numerical models of planetary core convection (529535)
Emily Kate Hawkins1, Jonathan Shuo Cheng2, Timothy Pilegard3, Stephan Stellmach4 and Jonathan M Aurnou1, (1)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (2)Eindhoven University of Technology, Department of Applied Physics and J.M. Burgers Center for Fluid Dynamics, Eindhoven, Netherlands, (3)L3 OceanServer Technology, Imperial Beach, CA, United States, (4)University of Münster, Institute for Geophysics, Münster, Germany
Geomagnetic Polar Minima Require Complex Tangent Cylinder Flows (542544)
Jonathan M Aurnou, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, Hao Cao, Harvard, Boston, MA, United States and Rakesh Kumar Yadav, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States
The Impact of Tracer Repositioning on Mass and Energy Conservation in Thermochemical Mantle Convection Models: Application to Entrainment at High Rayleigh Numbers (574471)
Sean James Trim, University of Saskatchewan, Saskatoon, SK, Canada, Julian Philip Lowman, University of Toronto, Toronto, ON, Canada and Samuel L Butler, Univ Saskatchewan, Saskatoon, SK, Canada
