Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.u31a..04n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #U31A-04
Mathematics
Logic
8120 Dynamics Of Lithosphere And Mantle: General (1213), 8124 Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), 8125 Evolution Of The Earth (0325)
Scientific paper
In order to understand variations in the non-dipole geomagnetic field over geologic time-scales, coupling processes between the core and mantle are important. The dominant coupling process for explaining such non-dipolar variations is lateral variations of the heat flow across the core-mantle boundary, as illustrated by numerical geodynamo modeling [Glatzmainer et al., 1999; Christensen and Olson, 2002; Christensen and Olson, 2004]. However, the origin of lateral variations of CMB heat flow and its relationship to seismic anomalies in the D?? region are uncertain. Here the nature of this thermal coupling, in particular the relationship between CMB heat flow and seismic and thermo-chemical anomalies, is studied using numerical simulations of thermo-chemical mantle convection in both two-dimensional cylindrical shell and three- dimensional spherical shell geometries. In general, the peak-to-peak variation in CMB heat flow is found to be larger than its mean value, but both decrease with increasing chemical layering above the CMB, and both quantities can change greatly over the history of the planet. Introduction of the post-perovskite transition appears to amplify lateral variations, particularly at short wavelengths. The relevant length scales and relationship to deep mantle structures will be discussed in the presentation.
Nakagawa Takao
Tackley Paul
No associations
LandOfFree
Lateral variations of CMB heat flow caused by a thermo-chemical boundary layer and the post-perovskite phase transition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Lateral variations of CMB heat flow caused by a thermo-chemical boundary layer and the post-perovskite phase transition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lateral variations of CMB heat flow caused by a thermo-chemical boundary layer and the post-perovskite phase transition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-962830