There are two phenomena of the Pleistocene glacial-interglacial cycles that have been deemed ‘paradoxes’. The first is that during the last million years, a 100-kyr periodicity exists in climate records despite a lack in spectral power of the 100-kyr (eccentricity) frequency. The second is concerning why this 100-kyr cyclicity appears at 1.2-0.7 Ma (the mid-Pleistocene transition (MPT)), when there is no change in orbital forcing.
These are commonly referred to jointly as the 100-kyr problem. The transition from the obliquity (41-kyr) to the eccentricity (100-kyr) paced world is referred to as the MPT. The motivating question I seek to understand is whether climate records spanning the last 2 Ma record MPT-type behavior and do they all show it with the same or differenttimings and magnitudes?
I employed multiple time-series statistical approaches to characterize the variance, regional mean states, global means, spectra of periodicity, time-evaluative spectra, relative timing and cross-spectral analyses. Many of these datasets had been previously investigated independently or in smallgroups, but this research represents a novel and more comprehensive view of ourcurrent understanding of the MPT. This work will provide a summary of our current best understanding of the evolution and periodicity of climate records spanning the MPT.