Nature research paper: Enhanced inner core fine-scale heterogeneity towards Earth’s centre
. The grey line is the observed ICS envelope. The red line is the best-fitting model prediction, and the blue line is a model prediction mismatching the observation by a factor of 4., All inner core heterogeneity models in this study. Green lines are the Class 1 models with uniform diffusivities. Red lines are the Class 2 models with stronger scattering strength in deep inner core. Blue lines are Class 3 models with weaker scattering with depth.
The inner core growth is in two steps: I. initial rapid growth stage ; and II. Steady growth stage . The right end of the x-axis is the present time. The left end, i.e., 0, is the moment when the centre of the primordial outer core cooled below its melting point. The y-axis is the normalized inner core radius at timeis the present inner core radius.
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