Advanced search

Filter By:

Journal Check one or more journals to show results from those journals only.

Choose more journals

Article type Check one or more article types to show results from those article types only.
Subject Check one or more subjects to show results from those subjects only.
Date Choose a date option to show results from those dates only.

Custom date range

Clear all filters
Sort by:
Showing 1–14 of 14 results
Advanced filters: Author: Gerald R. Dickens Clear advanced filters

  • Gas hydrates have been suggested as a carbon source for Palaeogene hyperthermal events, but warm seafloor temperatures are thought to have limited their accumulation. Numerical simulations suggest that enhanced organic carbon sedimentation and methanogenesis could have compensated for the smaller area of hydrate stability.

    • Guangsheng Gu
    • Gerald R. Dickens
    • Walter G. Chapman
    Research
    Nature Geoscience
    Volume: 4, P: 848-851

  • About 55 million years ago global surface temperatures increased by 5–9 ∘C within a few thousand years, following a pulse of carbon released to the atmosphere. Analysis of existing data with a carbon cycle model indicates that this carbon pulse was too small to cause the full amount of warming at accepted values for climate sensitivity.

    • Richard E. Zeebe
    • James C. Zachos
    • Gerald R. Dickens
    Research
    Nature Geoscience
    Volume: 2, P: 576-580

  • Identification of the Palaeocene/Eocene thermal maximum in a marine sedimentary sequence shows that sea surface temperatures near the North Pole increased from roughly 18 degrees Celsius to over 23 degrees Celsius — such warm values imply the absence of ice and thus exclude the influence of ice-albedo feedbacks on this Arctic warming.

    • Appy Sluijs
    • Stefan Schouten
    • Kathryn Moran
    Research
    Nature
    Volume: 441, P: 610-613

  • Exceptionally high resolution records of environmental change across the Palaeocene/Eocene boundary from two sediment sections in New Jersey find that the onset of environmental change and surface–ocean warming preceded the input of greenhouse gases by several thousand years. This sequence is consistent with the proposal that warming of the deep ocean caused the dissociation of submarine gas hydrates, which released massive amounts of methane.

    • Appy Sluijs
    • Henk Brinkhuis
    • Gerald R. Dickens
    Research
    Nature
    Volume: 450, P: 1218-1221

  • A core of sediments taken from underneath the Arctic Ocean provides evidence that ocean conditions could support a free-floating fern, Azolla, during the middle Eocene epoch, roughly 50 million years ago.

    • Henk Brinkhuis
    • Stefan Schouten
    • Kathryn Moran
    Research
    Nature
    Volume: 441, P: 606-609

  • Rising carbon levels contributed to profound climate change 55 million years ago. Where did that extra carbon come from? One proposal — a cometary impact — is rebuffed by two analyses of magnetic particles in clay sediment cores from New Jersey.

    • Gerald R. Dickens
    News & Views
    Nature Geoscience
    Volume: 1, P: 86-88

  • Analysis of Arctic Ocean sediment core spanning more than 50 million years identifies several key features of Arctic climate history — the revised timing of the earliest Arctic cooling events implied by this record coincides with those from Antarctica, supporting arguments that climate change is symmetric about the Earth's polar regions.

    • Kathryn Moran
    • Jan Backman
    • Yngve Kristoffersen
    Research
    Nature
    Volume: 441, P: 601-605

  • The rapidity and amount of carbon being released through human agency have been thought to be unprecedented. Not so, it emerges. From the evidence of anomalies in the ratios of carbon isotopes in an ocean core, it seems that, around 55 million years ago, there was an equivalently swift and massive blast of carbon into the ocean and atmosphere. The source was probably methane hydrates that are usually locked up in huge deposits on continental shelves.

    • Gerald R. Dickens
    News & Views
    Nature
    Volume: 401, P: 752-755

  • A dramatic historical episode of global warming seems to have been driven by the release of huge amounts of hydrocarbons. New evidence for what might have happened comes from the sea floor off Norway.

    • Gerald R. Dickens
    News & Views
    Nature
    Volume: 429, P: 513-515