globalchange  > 气候减缓与适应
DOI: 10.1029/2017JF004316
Scopus记录号: 2-s2.0-85048545641
论文题名:
Soil Particle Transport and Mixing Near a Hillslope Crest: 2. Cosmogenic Nuclide and Optically Stimulated Luminescence Tracers
作者: Furbish D.J.; Roering J.J.; Keen-Zebert A.; Almond P.; Doane T.H.; Schumer R.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期:5
起始页码: 1078
结束页码: 1093
语种: 英语
英文关键词: cosmogenic nuclide ; optically stimulated luminescence ; soil transport
Scopus关键词: hillslope ; luminescence ; optical method ; soil analysis ; soil column ; soil erosion ; soil surface
英文摘要: We examine probabilistic elements of how cosmogenic nuclide (e.g., 10Be) concentrations and optically stimulated luminescence (OSL) particle ages are distributed within a soil mantle near a hillslope crest as a consequence of disturbance-driven transport and particle mixing. We use an Eulerian-Lagrangian algorithm in which fluctuating particle motions, representing depth-dependent mixing, are superimposed on a two-dimensional mean motion. The intensity of mixing is characterized by a Péclet number involving the vertical speed of particles entering the soil mantle at the soil-bedrock interface, the mechanically active soil thickness, and a particle diffusivity at the soil surface. With weak mixing, the vertical profile of 10Be concentration reflects the strong influence of the mean motion in which particles spend much of their lives in the higher part of the soil column with higher 10Be production rates. With increasing mixing intensity, the profile becomes linear, then uniform, and the vertically averaged concentration is larger than that expected with one-dimensional motion. With weak mixing, particles possessing a finite OSL age tend to remain near the soil surface; with increasing mixing they become more uniformly distributed with depth. Depth-interval-averaged OSL ages increase linearly with depth and then become uniform with strong mixing. With moderate to strong mixing, the probability distribution of OSL ages is approximately exponential with an average much less than the mean residence time of particles. The formulation is consistent with profiles of 10Be concentrations and interval-averaged OSL particle ages compiled from published data, suggesting moderate to strong mixing in the cases examined. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114028
Appears in Collections:气候减缓与适应

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作者单位: Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, United States; Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States; Department of Soil and Physical Sciences, Faculty of Agriculture and Life Sciences, Lincoln University, Canterbury, New Zealand; Division of Hydrologic Sciences, Desert Research Institute, Reno, NV, United States

Recommended Citation:
Furbish D.J.,Roering J.J.,Keen-Zebert A.,et al. Soil Particle Transport and Mixing Near a Hillslope Crest: 2. Cosmogenic Nuclide and Optically Stimulated Luminescence Tracers[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(5)
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