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Fluvial response to abrupt global warming at the Palaeocene/Eocene boundary

机译：对古新世/始新世边界突然变暖的河流响应

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摘要

这项研究让我们对河流冲积系统对气候变化的rn反应有了更深的认识。河流沉积物性质的一个rn变化被发现与“古新世一始新世极热事件”rn(发生在距今约5，600万年前的 次显著的全rn球变暖事件)巧合。这个变化被解读为科罗拉rn多西部的河流系统响应于气候的深度变化而发rn生的突然重组。古景观恢复速度较慢，冲积模rn式中所记录的径流系统的变化在那次变暖事件rn后还持续了很长时间。%Climate strongly affects the production of sediment from mountain catchments as well as its transport and deposition within adjacent sedimentary basins. However, identifying climatic influences on basin stratigraphy is complicated by nonlinearities, feedback loops, lag times, buffering and convergence among processes within the sediment routeing system. The Palaeocene/ Eocene thermal maximum (PETM) arguably represents the most abrupt and dramatic instance of global warming in the Cenozoic era and has been proposed to be a geologic analogue for anthropogenic climate change. Here we evaluate the fluvial response in western Colorado to the PETM. Concomitant with the carbon isotope excursion marking the PETM we document a basin-wide shift to thick, multistoried, sheets of sandstone characterized by variable channel dimensions, dominance of upper flow regime sedimentary structures, and prevalent crevasse splay deposits. This progradation of coarse-grained lithofacies matches model predictions for rapid increases in sediment flux and discharge, instigated by regional vegetation overturn and enhanced monsoon precipitation. Yet the change in fluvial deposition persisted long after the approximately 200,000-year-long PETM with its increased carbon dioxide levels in the atmosphere, emphasizing the strong role the protracted transmission of catchment responses to distant depositional systems has in constructing large-scale basin stratigraphy. Our results, combined with evidence for increased dissolved loads and terrestrial clay export to world oceans, indicate that the transient hyper-greenhouse climate of the PETM may represent a major geomorphic 'system-clearing event, involving a global mobilization of dissolved and solid sediment loads on Earth's surface.
机译：这项研究让我们对河流冲积系统对气候变化的rn反应有了更深的认识。河流沉积物性质的一个rn变化被发现与“古新世一始新世极热事件”rn(发生在距今约5，600万年前的 次显着的全rn球变暖事件)巧合。这个变化被解读为科罗拉rn多西部的河流系统响应于气候的深度变化而发rn生的突然重组。古景观恢复速度较慢，冲积模rn式中所记录的径流系统的变化在那次变暖事件rn后还持续了很长时间。 %Climate strongly affects the production of sediment from mountain catchments as well as its transport and deposition within adjacent sedimentary basins. However, identifying climatic influences on basin stratigraphy is complicated by nonlinearities, feedback loops, lag times, buffering and convergence among processes within the sediment routeing system. The Palaeocene/ Eocene thermal maximum (PETM) arguably represents the most abrupt and dramatic instance of global warming in the Cenozoic era and has been proposed to be a geologic analogue for anthropogenic climate change. Here we evaluate the fluvial response in western Colorado to the PETM. Concomitant with the carbon isotope excursion marking the PETM we document a basin-wide shift to thick, multistoried, sheets of sandstone characterized by variable channel dimensions, dominance of upper flow regime sedimentary structures, and prevalent crevasse splay deposits. This progradation of coarse-grained lithofacies matches model predicti ons for rapid increases in sediment flux and discharge, instigated by regional vegetation overturn and enhanced monsoon precipitation. Yet the change in fluvial deposition persisted long after the approximately 200,000-year-long PETM with its increased carbon dioxide levels in the atmosphere, emphasizing the strong role the protracted transmission of catchment responses to distant depositional systems has in constructing large-scale basin stratigraphy. Our results, combined with evidence for increased dissolved loads and terrestrial clay export to world oceans, indicate that the transient hyper-greenhouse climate of the PETM may represent a major geomorphic 'system-clearing event, involving a global mobilization of dissolved and solid sediment loads on Earth's surface.

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  • 来源
    《Nature》 |2012年第7422期|p.92-95a3|共5页
  • 作者

    Brady Z. Foreman; Paul L. Heller; Mark T. Clementz;

  • 作者单位

    University of Wyoming, Department of Geology and Geophysics, 1000 East University Avenue, Laramie, Wyoming 82071, USA;

    University of Wyoming, Department of Geology and Geophysics, 1000 East University Avenue, Laramie, Wyoming 82071, USA;

    University of Wyoming, Department of Geology and Geophysics, 1000 East University Avenue, Laramie, Wyoming 82071, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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