Fig. 3: A globally coherent response to eccentricity and inconsistent response to obliquity in the Oligo-Miocene δ18Ob record.
From: Eccentricity pacing and rapid termination of the early Antarctic ice ages
a δ18Ob of ODP/IODP sites U1406 (bright red; presented here), 926 (dark red)29, 1090 (purple)30, 1218 (blue)21, and 1264 (yellow)19 during EMI (Early Miocene Interval), OMT (Oligocene-Miocene Transition), LOW (Late Oligocene Warming), and MOGI (Mid-Oligocene Glacial Interval). Blue shading indicates colder intervals (roughly equivalent to the MOGI/LOW transition and OMT interval) with high-amplitude variability in δ18Ob on frequencies corresponding to eccentricity. b eccentricity variance (VEcc) of the δ18Ob records shown in a), the composite δ18Ob record20,47 and the La2004 eccentricity solution41 shown in (c) with long-term eccentricity modulations of ~405 kyr and ~2.4 Myr offset for clarity. Grey line denotes maximum VEcc values in the 5.0−1.2 Ma interval of the LR04 δ18Ob stack39 (see Fig. S3). d obliquity variance (VObl) of the δ18Ob records shown in a), the composite δ18Ob record20,47, and La2004 obliquity solution (La2004, dashed)41 shown in (e) with amplitude modulation. Grey line denotes maximum VObl values in the 5.0−3.1 Ma interval of the LR04 δ18Ob stack39 (see Fig. S3). Note that the y-axes of VObl and VEcc are scaled differently to allow site-to-site comparisons (see Fig. S2b for plot with identical y-axes). Site locations shown in Fig. S1.
