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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Complex disturbance-driven reactivation of near-surface sediments in the largest dunefield in North America during the last 200 years
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Complex disturbance-driven reactivation of near-surface sediments in the largest dunefield in North America during the last 200 years

机译：在过去的200年期间，北美最大的Dunefield近视沉积物的复杂干扰驱动重新激活

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摘要

Understanding the historical activity of desert dune systems is important for identifying both the palaeoenvironmental drivers of change and the likelihood of future reactivation. Dating dune sediments in the Nebraska Sandhills has identified regional-scale dune activity over centennial and millennial timescales during the Holocene, occurring at 9.6-6.5, 3.8 and 2.5 ka, and most recently spanning the Medieval Climatic Anomaly 1050-650 years BP. These periods have been interpreted as palaeoclimatic evidence of intense aridity lasting decadal and centennial timescales. A detailed record of dune activity in the historical period, since EuroAmerican arrival, is lacking however, yet important for interpreting the role of human agency amongst the factors influencing disturbance. Without a high-resolution record of short-term, historical, local sediment mobilization, it is not possible to distinguish the environmental factor(s) responsible for local reactivation. In this paper, the individual drivers of vegetation disturbance are reviewed and presented alongside a luminescence-dated reconstruction of dune sediment deposition ages. This allows an integrated assessment of the relationship between drivers and environmental response over a recorded period. We focused our investigation on the aeolian reactivations of surface dune sediments and blowout features around the Niobrara Valley Preserve in the northern limits of the Nebraska Sandhills. Results show a near-continuous (within uncertainties) timeline of local reactivation across the sites studied, with variation between the individual features indicating that both regional (i.e. climatic) and local (i.e. land use) forcings contribute to surface disturbance. (c) 2019 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
机译：了解沙漠沙丘系统的历史活动对于识别古环境驱动因素以及未来重新激活的可能性非常重要。在内布拉斯加州沙丘上的约会沙丘沉积物已经确定了全年期间和千禧一代的区域规模的沙丘活动，在9.6-6.5,3.8和2.5 ka发生，最近跨越中世纪气候异常1050-650岁。这些时期被解释为持续持续的近代和百年时间粒度的群体脑力学证据。然而，历史时期的沙丘活动的详细记录，自欧洲欧洲抵达以来，缺乏，对于解释人造机构在影响干扰因素之间的角色来说很重要。如果没有短期，历史，局部沉积物动员的高分辨率记录，则无法区分负责局部再激活的环境因素。在本文中，综述了植被障碍的各个驱动因素，并与沙丘沉积物沉积年龄的发光 - 日期重建综述。这允许在记录期内综合评估司机与环境响应之间的关系。我们专注于我们对内布拉斯加州Sandhills北部限制的Niobrara Valley Preserve周围的Surface Dune沉积物和井喷特征的调查。结果显示近连续（在不确定因素内）在所研究的网站上的局部再激活的时间表，具有各个特征之间的变化，表明区域（即气候）和当地（即土地使用）强制有助于表面干扰。 （c）2019年作者。 John Wiley＆Sons Ltd.出版的地球表面流程和地貌

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