Fig. 8: Evolutionary spectral analysis of dust and productivity time series for the past 1.5 Ma.
From: Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years
a U1537 magnetic susceptibility (MS). b U1537 Fe counts of Site U1537. c ODP Site 1090 Fe mass accumulation rates (MAR)6. d Relative sea level of the Mediterranean49. e Color reflectance b* of U1537. f Gamma-ray density (GRA) of U1537. g Deep-sea isotopic stack LR04 (ref. 23). h Combined CO2 record from Antarctic ice cores84. Analysis was carried out with software ACYCLE85, using the fast Fourier transform, a window size of 300 kyr, and a 2.5 kyr moving window. E, T and P refer to the relative positions of eccentricity, tilt (obliquity) and precession, respectively. Note that MS and Fe counts of U1537 show a switch from 40-kyr to 100-kyr periodicity around 1.25 Ma at the beginning of the Mid-Pleistocene Transition (MPT). Additional important changes are documented half way through the MPT around 0.9 Ma and around 0.7 Ma at the end of the MPT (see text for details).
