Climate Response to Orbital Forcing Across the Oligocene-Miocene Boundary

  title={Climate Response to Orbital Forcing Across the Oligocene-Miocene Boundary},
  author={James C. Zachos and Nicholas John Shackleton and Justin Revenaugh and Heiko P{\"a}like and Benjamin P. Flower},
  pages={274 - 278}
Spectral analyses of an uninterrupted 5.5-million-year (My)–long chronology of late Oligocene–early Miocene climate and ocean carbon chemistry from two deep-sea cores recovered in the western equatorial Atlantic reveal variance concentrated at all Milankovitch frequencies. Exceptional spectral power in climate is recorded at the 406-thousand-year (ky) period eccentricity band over a 3.4-million-year period [20 to 23.4 My ago (Ma)] as well as in the 125- and 95-ky bands over a 1.3-million-year… 

Dynamics of ~100-kyr glacial cycles during the early Miocene

Here, we present high-resolution stable isotope records from ODP Site 1264 in the South-Eastern Atlantic Ocean, which resolve the latest Oligocene to early Miocene (23.7–18.9 Ma) climate changes.

Obliquity and long eccentricity pacing of the Middle Miocene climate transition

The Middle Miocene East Antarctic ice sheet expansion (EAIE), which is indicated by an abrupt ~1‰ increase in global benthic foraminiferal δ18O at ~13.8 Ma, marks the Middle Miocene climate

Oligocene climate dynamics

A planktonic and benthic foraminiferal stable isotope stratigraphy of the Oligocene equatorial Pacific (Ocean Drilling Program, Site 1218) was generated at 6 kyr resolution between magnetochrons C9n

Orbital forcing of the Paleocene and Eocene carbon cycle

Multimillion-year proxy records across the Paleocene and Eocene show prominent variations on orbital time scales. The cycles, which have been identified at various sites across the globe,

Orbitally Paced Climate Variability During the Middle Miocene: High Resolution Benthic Foraminiferal Stable‐Isotope Records From the Tropical Western Pacific

We generated a high resolution (∼8 ky) benthic record from a West Pacific marginal basin to investigate the detailed structure and spectral characteristics of deep water isotope fluctuations during

Orbital Forcing, Ice Volume, and CO2 Across the Oligocene‐Miocene Transition

Paleoclimate records suggest that a rapid major transient Antarctic glaciation occurred across the Oligocene‐Miocene transition (OMT; ca. 23 Ma; ~50‐m sea level equivalent in 200–300 kyr). Orbital

Middle to late Miocene stepwise climate cooling: Evidence from a high-resolution deep water isotope curve spanning 8 million years

[1] We present high-resolution (2–3 kyr) benthic foraminiferal stable isotopes in a continuous, well-preserved sedimentary archive from the West Pacific Ocean (Ocean Drilling Program Site 1146),



Orbitally paced climate oscillations across the Oligocene/Miocene boundary

The late Oligocene and early Miocene periods, some 21 to 27 million years ago, have generally been viewed as times of moderate global warmth and ice-free conditions. Yet several lines of evidence

Orbitally Induced Climate and Geochemical Variability Across the Oligocene/Miocene Boundary

To assess the influence of orbital-scale variations on late Oligocene to early Miocene climate and ocean chemistry, high-resolution (∼5 kyr) benthic foraminiferal carbon and oxygen isotope and

Astronomical calibration of Oligocene--Miocene time

A provisional time–scale for the Oligocene is created by assuming that the cyclicity is a response to orbital obliquity variation, and by using spectral analysis to estimate the mean wavelength and hence the sedimentation rate of successive intervals of core.

A long marine history of carbon cycle modulation by orbital-climatic changes.

  • T. Herbert
  • Environmental Science, Geography
    Proceedings of the National Academy of Sciences of the United States of America
  • 1997
Nonlinear responses of the carbon system may help to amplify relatively weak orbital insolation anomalies into more significant climatic perturbations through positive feedback effects, and transformed orbital-climatic cycles into long-wavelength features on time scales comparable to the residence times of carbon and nutrient elements in the ocean.

Eccentricity forcing of Pliocene–Early Pleistocene climate revealed in a marine oxygen-isotope record

Milankovitch theory—that climate is controlled by variations in the Earth's orbital parameters—has gained wide acceptance for its ability to account for two climate cycles: a 23-kyr cycle that is

The Initiation of Northern Hemisphere Glaciation

  • M. Raymo
  • Environmental Science, Geography
  • 1994
For well over a century, scientists have speculated that variations in the atmospheric concentration of radiatively important trace gases, such as carbon dioxide, could control the Earth's climate

High‐resolution (104 years) deep‐sea foraminiferal stable isotope records of the Eocene‐Oligocene climate transition

We have constructed high-resolution (104– 105 years) benthic foraminiferal δ13C and δ18O records for the upper Eocene through lower Oligocene of two pelagic sequences, Deep Sea Drilling Project