Northern Hemisphere glaciation and the evolution of Plio‐Pleistocene climate noise

摘要: [1] Deterministic orbital controls on climate variability are commonly inferred to dominate across timescales of 104–106 years, although some studies have suggested that stochastic processes may be equal or greater importance. Here we explicitly quantify changes in deterministic (forcing and/or pacing) versus during the Plio-Pleistocene, via time-frequency analysis two prominent foraminifera oxygen isotopic stacks. Our results indicate development Northern Hemisphere ice sheet is paralleled by an overall amplification both and energy, but their relative dominance variable. The progression from a more early Pliocene strongly late Pleistocene primarily accommodated transitory phases growth. This long-term trend punctuated “stochastic events,” which interpret as evidence for abrupt reorganization system at initiation termination mid-Pleistocene transition onset glaciation. In addition highlighting complex interplay between change our support glaciation (between 3.5 3.7 Ma) reveal new characteristics signal response, such puzzling emergence 100 ka 400 cyclic theoretical eccentricity nodes.