Fig. 8: Paleo-erosion rates and conceptual mechanism for observed 400-kyr cycles.
From: Milankovitch-paced erosion in the southern Central Andes
a Calculated 10Be-derived paleo-erosion rates (±2σ envelope) from 1.8-3.8 Ma compared to modern 10Be-derived erosion rates (0.34 ± 0.01 mm/yr) and 400-kyr eccentricity pacing. Erosion-rate values shown are based on the preferred uplift scenario (Supplementary Fig. 4b). b Conceptual model illustrating how a 400-kyr erosion-rate signal with an order-of-magnitude variation in erosion rates might be produced from a nonlinear erosional response to precession-forced precipitation variability (in purple; Fig. 4f) above a hydrologic threshold for transport/landsliding. Black dots represent erosion rates that track the precipitation amplitude above the threshold (dashed black line) for each 23-kyr precession cycle. Note the nonlinear erosion-rate axis. SAMS = South American Monsoon System.
