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    Worldwide acceleration of mountain erosion under a cooling climate

    Herman, F. and Seward, D. and Valla, P.G. and Carter, Andrew and Kohn, B. and Willett, S.D. and Ehlers, T.A. (2013) Worldwide acceleration of mountain erosion under a cooling climate. Nature 504 (7480), pp. 423-426. ISSN 0028-0836.

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    Abstract

    Climate influences the erosion processes acting at the Earth’s surface. However, the effect of cooling during the Late Cenozoic era, including the onset of Pliocene–Pleistocene Northern Hemisphere glaciation (about two to three million years ago), on global erosion rates remains unclear1, 2, 3, 4. The uncertainty arises mainly from a lack of consensus on the use of the sedimentary record as a proxy for erosion3, 4 and the difficulty of isolating the respective contributions of tectonics and climate to erosion5, 6, 7. Here we compile 18,000 bedrock thermochronometric ages from around the world and use a formal inversion procedure8 to estimate temporal and spatial variations in erosion rates. This allows for the quantification of erosion for the source areas that ultimately produce the sediment record on a timescale of millions of years. We find that mountain erosion rates have increased since about six million years ago and most rapidly since two million years ago. The increase of erosion rates is observed at all latitudes, but is most pronounced in glaciated mountain ranges, indicating that glacial processes played an important part. Because mountains represent a considerable fraction of the global production of sediments9, our results imply an increase in sediment flux at a global scale that coincides closely with enhanced cooling during the Pliocene and Pleistocene epochs10, 11.

    Metadata

    Item Type: Article
    School: School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 22 Jan 2014 15:14
    Last Modified: 11 Oct 2016 11:55
    URI: https://eprints.bbk.ac.uk/id/eprint/9087

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