Global Cooling During the Eocene-Oligocene Climate Transition

  title={Global Cooling During the Eocene-Oligocene Climate Transition},
  author={Zhonghui Liu and Mark Pagani and David A. Zinniker and Robert M. DeConto and Matthew Huber and Henk Brinkhuis and Sunita R. Shah and Robert Mark Leckie and Ann Pearson},
  pages={1187 - 1190}
About 34 million years ago, Earth's climate shifted from a relatively ice-free world to one with glacial conditions on Antarctica characterized by substantial ice sheets. How Earth's temperature changed during this climate transition remains poorly understood, and evidence for Northern Hemisphere polar ice is controversial. Here, we report proxy records of sea surface temperatures from multiple ocean localities and show that the high-latitude temperature decrease was substantial and… 

Large-scale glaciation and deglaciation of Antarctica during the Late Eocene

Approximately 34 m.y. ago, Earth's climate transitioned from a relatively warm, ice-free world to one characterized by cooler climates and a large, permanent Antarctic Ice Sheet. Understanding this

Increased seasonality through the Eocene to Oligocene transition in northern high latitudes

Northern high-latitude terrestrial climate estimates for the Eocene to Oligocene interval, based on bioclimatic analysis of terrestrially derived spore and pollen assemblages preserved in marine sediments from the Norwegian–Greenland Sea indicate a cooling of ∼5 °C in cold-month (winter) mean temperatures to 0–2‬C, and a concomitant increased seasonality before the Oi-1 glaciation event.

Transient temperature asymmetry between hemispheres in the Palaeogene Atlantic Ocean

During the Late Palaeogene between ~40 and 23 million years ago (Ma), Earth transitioned from a warm non-glaciated climate state and developed large dynamic ice sheets on Antarctica. This transition

The enigma of Oligocene climate and global surface temperature evolution

It is found that high-latitude temperatures were almost as warm after the initiation of Antarctic glaciation as before, challenging basic understanding of how climate works, and of the development of climate and ice volume through time.

Oligocene and Miocene TEX 86-derived seawater temperatures from offshore Wilkes Land ( East Antarctica )

The volume of the Antarctic continental ice sheet(s) varied substantially during the Oligocene and Miocene (~34-5 Ma) from smaller to substantially larger than today, both on million-year and on

Climatic and tectonic drivers of late Oligocene Antarctic ice volume

Cenozoic evolution of the Antarctic ice sheets is thought to be driven primarily by long-term changes in radiative forcing, but the tectonic evolution of Antarctica may also have played a substantive

Oligocene Wilkes Land sea surface temperature Antarctic ice sheet 10

The volume of the Antarctic continental ice sheet(s) varied substantially during the Oligocene and 25 Miocene (~34-5 Ma) from smaller to substantially larger than today, both on million-year and on

Terrestrial cooling in Northern Europe during the Eocene–Oligocene transition

The authors' data show a decrease in growing-season surface water temperatures corresponding to an average decrease in mean annual air temperature from the Late Eocene to Early Oligocene, which suggests a close linkage between atmospheric carbon dioxide concentrations, Northern Hemisphere temperature, and expansion of the Antarctic ice sheets.



Cooling and ice growth across the Eocene-Oligocene transition

The Eocene-Oligocene (E-O) climate transition (ca. 34 Ma) marks a period of Antarctic ice growth and a major step from early Cenozoic greenhouse conditions toward today's glaciated climate state. The

Continental ice in Greenland during the Eocene and Oligocene

The Eocene and Oligocene epochs (∼55 to 23 million years ago) comprise a critical phase in Earth history. An array of geological records supported by climate modelling indicates a profound shift in

Thresholds for Cenozoic bipolar glaciation

It is found that Oi-1 is best explained by Antarctic glaciation alone, combined with deep-sea cooling of up to 4 °C and Antarctic ice that is less isotopically depleted than previously suggested, which implies that episodic northern-hemispheric ice sheets have been possible some 20 million years earlier than currently assumed and could explain some of the variability in Miocene sea-level records.

Stable warm tropical climate through the Eocene Epoch

Earth's climate cooled from a period of extreme warmth in the early Eocene Epoch (ca. 50 Ma) to the early Oligocene (ca. 33 Ma), when a large ice cap first appeared on Antarctica. Evidence from the

Large temperature drop across the Eocene–Oligocene transition in central North America

The large change in mean annual temperature, exceeding changes in sea surface temperatures at comparable latitudes and possibly delayed in time with respect to marine changes by up to 400,000 years, explains the faunal turnover for gastropods, amphibians and reptiles, whereas most mammals in the region were unaffected.

Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2

In this simulation, declining Cenozoic CO2 first leads to the formation of small, highly dynamic ice caps on high Antarctic plateaux, and at a later time, a CO2 threshold is crossed, initiating ice-sheet height/mass-balance feedbacks that cause the ice caps to expand rapidly with large orbital variations, eventually coalescing into a continental-scale East Antarctic Ice Sheet.

Tropical sea temperatures in the high-latitude South Pacific during the Eocene

Sea-surface temperature (SST) estimates of ~30 °C from planktic foraminifera and archaeal membrane lipids in bathyal sediments in the Canterbury Basin, New Zealand, support paleontological evidence

Cenozoic deep-Sea temperatures and global ice volumes from Mg/Ca in benthic foraminiferal calcite

A deep-sea temperature record for the past 50 million years has been produced from the magnesium/calcium ratio (Mg/Ca) in benthic foraminiferal calcite. The record is strikingly similar in form to

Sea ice feedback and Cenozoic evolution of Antarctic climate and ice sheets

[1] The extent and thickness of Antarctic sea ice have important climatic effects on radiation balance, energy transfer between the atmosphere and ocean, and moisture availability. This paper