Abstract
Numerical dynamos with outer boundary heat flux inferred from probabilistic tomography—consequences for latitudinal distribution of magnetic flux
Highlights
Various observed features of the geodynamo have been recovered by imposing heterogeneous heat flux patterns on the outer boundary of numerical dynamo simulations (e.g. Olson & Christensen 2002; Christensen & Olson 2003; Gubbins et al 2007; Aubert et al 2007, 2008; Davies et al 2008)
The pattern derived from probabilistic tomography (Fig. 6b and cases ‘P’ in Table 1) is characterized by smaller scales
Three positive anomalies appear below Central America, Indonesia and east Australia, that is, most of the large core–mantle boundary (CMB) heat flux is concentrated at low latitudes
Summary
Various observed features of the geodynamo have been recovered by imposing heterogeneous heat flux patterns on the outer boundary of numerical dynamo simulations (e.g. Olson & Christensen 2002; Christensen & Olson 2003; Gubbins et al 2007; Aubert et al 2007, 2008; Davies et al 2008). Masters et al 2000), it has been suggested that these two pairs of intense high-latitude geomagnetic flux patches are maintained by the lower-mantle heterogeneity (Bloxham 2002; Olson & Christensen 2002; Gubbins et al 2007; Aubert et al 2008). Jackson (2003) noted the presence of intense flux patches at the equatorial region as well, in particular below Africa and the Atlantic Ocean (Fig. 1) The existence of these low-latitude features is less well understood, especially because numerical dynamos are often characterized by zonal equatorial upwelling (Aubert 2005; Amit & Olson 2006) that disperses field lines at low latitudes
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