How Antarctica got its ice

  title={How Antarctica got its ice},
  author={Caroline H. Lear and Daniel J. Lunt},
  pages={34 - 35}
  • C. LearD. Lunt
  • Published 1 April 2016
  • Environmental Science, Geology
  • Science
A complex set of interactions caused the rapid growth of the Antarctic ice sheet 34 million years ago [Also see Report by Galeotti et al.] Ice sheets such as those on Greenland and Antarctica today not only respond to changing climate but can also cause climate to change. Their sizes have fluctuated substantially in the past. In particular, Antarctica was effectively ice-free until its ice cover began to expand rapidly at the Eocene-Oligocene boundary around 34 million years ago (see the figure… 

Climate sensitivity and meridional overturning circulation in the late Eocene using GFDL CM2.1

Abstract. The Eocene–Oligocene transition (EOT), which took place approximately 34 Ma ago, is an interval of great interest in Earth's climate history, due to the inception of the Antarctic ice sheet

Meridional Contrasts in Productivity Changes Driven by the Opening of Drake Passage

Changes in atmospheric pCO2 are widely suggested to have played a major role in both the long‐term deterioration of Cenozoic climate and many superimposed rapid climate perturbations such as the

The coastal North Pacific: Origins and history of a dominant marine biota

Some biogeographical regions act primarily as donors of colonists to other regions, while others act predominantly as recipient areas. How some biotas become dominant while others do not is a largely

Tectonics, climate and the diversification of the tropical African terrestrial flora and fauna

This work critically review and synthesize African climate, tectonics and terrestrial biodiversity evolution throughout the Cenozoic to the mid‐Pleistocene, drawing on recent advances in Earth and life sciences.

Geological Society of London Scientific Statement: what the geological record tells us about our present and future climate

have reached equilibrium. The geological record provides powerful evidence that atmospheric CO 2 concentrations drive climate change, and supports multiple lines of evidence that greenhouse gases

Early Stage Adaptation of a Mesophilic Green Alga to Antarctica: Systematic Increases in Abundance of Enzymes and LEA Proteins

It is reported that an Antarctic strain of Chlorella vulgaris, called NJ-7, acquired the capability to grow at near 0 °C temperatures and greatly enhanced freezing tolerance after systematic increases in abundance of enzymes/proteins and positive selection of certain genes.

No need for stepping stones: Direct, joint dispersal of the lichen‐forming fungus Mastodia tessellata (Ascomycota) and its photobiont explains their bipolar distribution

Novel evidence of a pre-Pleistocene long-term evolution of lichens in Antarctica as well as for bipolar distributions shaped by Southern to Northern Hemisphere migratory routes without the need for stepping stones is provided.

’ s repository of research publications and other research outputs Geological Society of London Scientific Statement : what the geological record tells us about our present and future climate

Lear, Caroline H.; Anand, Pallavi; Blenkinsop, Tom; Foster, Gavin L.; Gagan, Mary; Hoogakker, Babette; Larter, Robert D.; Lunt, Daniel J.; McCave, I. Nicholas.; McClymont, Erin; Pancost, Richard D.;




Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition

Sedimentary cycles from a drillcore in the western Ross Sea provide direct evidence of orbitally controlled glacial cycles between 34 million and 31 million years ago and provide insight into the potential of the AIS for threshold behavior and have implications for its sensitivity to atmospheric CO2 concentrations above present-day levels.

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.

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.

Atmospheric carbon dioxide through the Eocene–Oligocene climate transition

The results confirm the central role of declining in the development of the Antarctic ice sheet (in broad agreement with carbon cycle modelling) and help to constrain mechanisms and feedbacks associated with the Earth’s biggest climate switch of the past 65 Myr.

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.

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

Links between CO 2 , glaciation and water flow: reconciling the Cenozoic history of the Antarctic Circumpolar Current

Abstract. The timing of the onset of the Antarctic Circumpolar Current (ACC) is a crucial event of the Cenozoic because of its cooling and isolating effect over Antarctica. It is intimately related