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Showing 1–14 of 14 results
Advanced filters: Author: Maureen E. Raymo Clear advanced filters

  • Much progress has been made towards understanding what caused the waxing and the waning of the great ice sheets, but a complete theory of the ice ages is still elusive.

    • Maureen E. Raymo
    • Peter Huybers
    Special Features
    Nature
    Volume: 451, P: 284-285

  • Estimates for sea level three million years ago, a period with similar atmospheric CO2 levels to today, vary from 10 to 40 m above present. Glacial isostatic adjustment modelling suggests that variations in the height of palaeoshorelines result from the residual adjustment of continental flexure following recent glaciations.

    • Maureen E. Raymo
    • Jerry X. Mitrovica
    • Paul J. Hearty
    Research
    Nature Geoscience
    Volume: 4, P: 328-332

  • The US beef industry is regarded as environmentally unsustainable. Modelling a system where cattle subsist solely on grass and food industry by-products, the authors estimate that 45% of current production could be achieved without the use of any high quality cropland.

    • Gidon Eshel
    • Alon Shepon
    • Ron Milo
    Research
    Nature Ecology & Evolution
    Volume: 2, P: 81-85

  • Sea level during the last interglacial period reached a peak of between 5 and 9 m above the present-day level. A detailed reconstruction of sea level and isostatic rebound from Western Australia indicates a prolonged period of sea-level stability at 3–4 m above present, followed by an abrupt sea-level rise of 5–6 m.

    • Michael J. O’Leary
    • Paul J. Hearty
    • Jody M. Webster
    Research
    Nature Geoscience
    Volume: 6, P: 796-800

  • The magnitude of sea level rise during marine isotope stage 11 (about 400,000 years ago) is shown to have been probably only 6 to 13 metres, in contrast to some earlier estimates of up to 20 metres.

    • Maureen E. Raymo
    • Jerry X. Mitrovica
    Research
    Nature
    Volume: 483, P: 453-456

  • Comprehensive climate and ice-sheet models show that insolation and internal feedbacks between the climate, the ice sheets and the lithosphere–asthenosphere system explain the 100,000-year period on which the Northern Hemisphere ice sheets grow and shrink.

    • Ayako Abe-Ouchi
    • Fuyuki Saito
    • Heinz Blatter
    Research
    Nature
    Volume: 500, P: 190-193

  • Sedimentary ancient DNA can indicate ecosystem-wide changes. Here, the authors show association between warm phases and high diatom abundance in the Antarctic Scotia Sea, in addition to presenting ancient eukaryote sedimentary DNA spanning the last approximately 1 million years.

    • Linda Armbrecht
    • Michael E. Weber
    • Xufeng Zheng
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-14

  • A new high-resolution record for the Antarctic Zone shows persistent anti-phasing of high interglacial ocean productivity and high glacial dust deposition, suggesting a close inter-hemispheric coupling of cryosphere, ocean and atmosphere.

    • Michael E. Weber
    • Ian Bailey
    • Xufeng Zheng
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-18

  • A new chronology for Antarctic ice cores has been constructed based on the ratio of oxygen to nitrogen molecules in air trapped in the ice. This seems to reflect changes in local summer insolation, and thus allows the relative timing of changes in insolation and Antarctic climate to be determined. The results show that orbital-scale Antarctic climate change lagged Northern Hemisphere insolation over the past 360,000 years, and that increases in Antarctic temperature at the last four glacial-interglacial transitions took place within phases of increasing Northern Hemisphere insolation.

    • Kenji Kawamura
    • Frédéric Parrenin
    • Okitsugu Watanabe
    Research
    Nature
    Volume: 448, P: 912-916