globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.002
论文题名:
Glacial-interglacial climate changes recorded by debris flow fan deposits, Owens Valley, California
作者: D'Arcy M.; Roda-Boluda D.C.; Whittaker A.C.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 169
起始页码: 288
结束页码: 311
语种: 英语
Scopus关键词: Catchments ; Debris ; Deposits ; Earth (planet) ; Glacial geology ; Grain size and shape ; Landforms ; Orbits ; Rain ; Sediments ; Storms ; Stratigraphy ; Climate dynamics ; Climatic variables ; Debris flow deposits ; Erosion and sedimentation ; Glacial-interglacial cycles ; Grain size distribution ; Interglacial climate ; Physical mechanism ; Climate change ; alluvial fan ; catchment ; climate forcing ; climate variation ; debris flow ; El Nino ; glacial-interglacial cycle ; grain size ; lithostratigraphy ; rainfall ; sediment transport ; sedimentation ; size distribution ; temperature ; California ; Owens Valley ; United States
英文摘要: It is hotly debated whether and how climate changes are recorded by terrestrial stratigraphy. Basin sediments produced by catchment-alluvial fan systems may record past climate over a variety of timescales, and could offer unique information about how climate controls sedimentation. Unfortunately, there are fundamental uncertainties about how climatic variables such as rainfall and temperature translate into sedimentological signals. Here, we examine 35 debris flow fan surfaces in Owens Valley, California, that record deposition throughout the past 125,000 years, during which climate has varied significantly. We show that the last full glacial-interglacial cycle is recorded with high fidelity by the grain size distributions of the debris flow deposits. These flows transported finer sediment during the cooler glacial climate, and became systematically coarser-grained as the climate warmed and dried. We explore the physical mechanisms that might explain this signal, and rule out changes in sediment supply through time. Instead, we propose that grain size records past changes in storm intensity, which is responsible for debris flow initiation in this area and is decoupled from average rainfall rates. This is supported by an exponential Clausius-Clapeyron-style scaling between grain size and temperature, and also reconciles with climate dynamics, and the initiation of debris flows, and observations from El Niño events. The fact that these alluvial fans exhibit a strong, sustained sensitivity to orbital climate changes sheds new light on how eroding landscapes and their sedimentary products respond to climatic forcing. Finally, our findings highlight the importance of threshold-controlled events, such as storms and debris flows, in driving erosion and sedimentation at the Earth's surface in response to climate change. © 2017 Elsevier Ltd
资助项目: D'Arcy, M. ; University of Potsdam, Institute of Earth and Environmental Science, Karl-Liebknecht-Str. 24-25, Germany ; 电子邮件: mdarcy@uni-potsdam.de
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59172
Appears in Collections:过去全球变化的重建

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作者单位: Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, Exhibition Road, London, United Kingdom

Recommended Citation:
D'Arcy M.,Roda-Boluda D.C.,Whittaker A.C.. Glacial-interglacial climate changes recorded by debris flow fan deposits, Owens Valley, California[J]. Quaternary Science Reviews,2017-01-01,169
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