Extended Data Figure 2: A predominant 100-kyr (eccentricity) cycle in hydroclimate since the Mid-Pleistocene Transition.
From: A progressively wetter climate in southern East Africa over the past 1.3 million years
Blackman–Tukey spectral power versus per year (‘1/Y’) of 500-kyr intervals from the present back to one million years ago, of the lake-level record portrayed in Extended Data Fig. 1, when dated with the tuned age model depicted in Extended Data Fig. 6. Bandwidth is 0.0001 and the 80% error estimate on the power spectra is 0.626. We note the strong eccentricity cycle back to 900 kyr ago, and its diminishing influence before then. Whereas the temperature record would display this cycle simply because it was tuned to LR04, the lake level record was derived independently of the temperature data14.
