Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2

  title={Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2},
  author={Robert M. DeConto and David D. Pollard},
The sudden, widespread glaciation of Antarctica and the associated shift towards colder temperatures at the Eocene/Oligocene boundary (∼34 million years ago) (refs 1–4) is one of the most fundamental reorganizations of global climate known in the geologic record. The glaciation of Antarctica has hitherto been thought to result from the tectonic opening of Southern Ocean gateways, which enabled the formation of the Antarctic Circumpolar Current and the subsequent thermal isolation of the… 
A coupled climate–ice sheet modeling approach to the Early Cenozoic history of the Antarctic ice sheet
Abstract The sudden, widespread glaciation of Antarctica and the associated shift toward colder temperatures near the Eocene–Oligocene boundary (∼34 Ma) represents one of the most fundamental
Changing Southern Ocean palaeocirculation and effects on global climate
Southern Ocean palaeocirculation is clearly related to the formation of a continental ice sheet on Antarctica and the opening of gateways between Antarctica and the Australian and South American
Was the Antarctic glaciation delayed by a high degassing rate during the early Cenozoic
Abstract The Cenozoic is a period of major climatic changes marked by the formation of the Antarctic ice sheet at the Eocene/Oligocene (E/O) boundary. The opening of the southern ocean seaways 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
Antarctic glaciation caused ocean circulation changes at the Eocene–Oligocene transition
It is found that growth of the Antarctic ice sheet caused enhanced northward transport of Antarctic intermediate water and invigorated the formation of Antarctic bottom water, fundamentally reorganizing ocean circulation, whereas gateway openings had much less impact on ocean thermal stratification and circulation.
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.
Atmospheric and oceanic impacts of Antarctic glaciation across the Eocene–Oligocene transition
It is shown that the global atmosphere and ocean response to growth of the Antarctic ice sheet is sensitive to subtle variations in palaeogeography, using two reconstructions representing Eocene and Oligocene geological stages using the HadCM3L model.
Eocene bipolar glaciation associated with global carbon cycle changes
The transition from the extreme global warmth of the early Eocene ‘greenhouse’ climate ∼55 million years ago to the present glaciated state is one of the most prominent changes in Earth's climatic
No extreme bipolar glaciation during the main Eocene calcite compensation shift
Test the hypothesis that large ice sheets were present in both hemispheres ∼41.6 million years ago using marine sediment records of oxygen and carbon isotope values and of calcium carbonate content from the equatorial Atlantic Ocean to resolve the apparent discrepancy between the geological records of Northern Hemisphere glaciation.
Wilkes land glacial history Cenozoic East Antarctic ice sheet evolution from Wilkes Land margin sediments
Understanding the evolution and dynamics of the Antarctic cryosphere, from its inception during the Eocene–Oligocene transition (~33 Ma) through the significant periods of climate change during the


The Opening of the Tasmanian Gateway Drove Global Cenozoic Paleoclimatic and Paleoceanographic Changes: Results of Leg 189
The major ice sheets of the Cenozoic Era are unusual in geological history. Progressive cooling at high latitudes during the Cenozoic eventually formed major ice sheets, initially on Antarctica and
Cenozoic evolution of Antarctic glaciation the Circum-Antarctic Ocean and their impact on global paleoceanography
Deep-sea drilling in the Antarctic region (Deep-Sea Drilling Project legs 28, 29, 35, and 36) has provided many new data about the development of circum-Antarctic circulation and the closely related
Glaciological modelling of the late Cenozoic East Antarctic ice sheet: Stability or dynamism?
On the basis of geological arguments, two widely different hypotheses have been proposed for the late-Tertiary glacial history of East Antarctica. Theseinvoke ice-sheet reconstructions ranging from
Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary
Sediment data from shallow marine cores in the western Ross Sea are presented that exhibit well dated cyclic variations, and which link the extent of the East Antarctic ice sheet directly to orbital cycles during the Oligocene/Miocene transition, suggesting that orbital influences at the frequencies of obliquity and eccentricity controlled the oscillations of the ice margin at that time.
Miocene evolution of atmospheric carbon dioxide
Changes in pCO2 or ocean circulation are generally invoked to explain warm early Miocene climates and a rapid East Antarctic ice sheet (EAIS) expansion in the middle Miocene. This study reconstructs
The development of paleoseaways around Antarctica
Gondwana, with East Antarctica as its center, began to fragment during Late Triassic to Early Jurassic time. With the exception of the Permian or older convergent Pacific margin of the Antarctic
Sedimentological evidence for the formation of an East Antarctic ice sheet in Eocene/Oligocene time
Middle Eocene to late Oligocene sediments recovered at Ocean Drilling Program Sites 689 and 690 on Maud Rise in the southernmost Atlantic Ocean and at Sites 738 and 744 on Kerguellen Plateau in the
Origin of the Middle Pleistocene Transition by ice sheet erosion of regolith
The transition in the middle Pleistocene (∼0.9 Ma) seen in δ18O deep-sea-core records from relatively low-amplitude, high-frequency (41 kyr) to high-amplitude, low-frequency (100 kyr) ice volume
Tectonic boundary conditions for climate reconstructions
Introduction 1. Significance of Tectonic Boundary Conditions for Paleoclimate Simulations I. Role of Continental Configuration 2. The Role of Geography and Atmospheric CO2 in Long-Term Climate
Early Oligocene ice-sheet expansion on Antarctica: Stable isotope and sedimentological evidence from Kerguelen Plateau, southern Indian Ocean
Sedimentological and stable isotope data from a pelagic sequence recovered from the southern Indian Ocean provide the most convincing evidence to date for short-term expansion of a large ice sheet on