Fig. 4: Results of the MCMC inversion modelling of the two limiting-case scenarios.
From: Cosmogenic in situ 14C-10Be reveals abrupt Late Holocene soil loss in the Andean Altiplano
Model results are based on a joint inversion of three hilltop samples and four fluvial samples that show a 14C-10Be offset. We assume that all samples record the same timing of the perturbation but have variable bedrock-controlled past and present erosion rates. a The step model shows the ratio of present to past erosion rates (ε2/ε1) over time illustrating the possible timing and amplitude of erosion rate increase in the past. Note the change in scale of the y axis in the plot for the fluvial samples, which indicates an overall larger amplitude of perturbation. b The spike model shows the possible magnitude of surface lowering (in m) over time. The colour ramp applies to all plots and shows the density of accepted models normalized to the highest value such that the most frequent results are denoted by P = 1. Both limiting-case scenarios indicate that a strong landscape perturbation occurred in the Late Holocene.
