气候变化领域集成服务门户(CCPortal): Covariation of cross-divide differences in denudation rate and χ: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet

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DOI	10.1016/j.epsl.2021.116812
	Covariation of cross-divide differences in denudation rate and χ: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet
	Hu K.; Fang X.; Ferrier K.L.; Granger D.E.; Zhao Z.; Ruetenik G.A.
发表日期	2021
ISSN	0012821X
卷号	562
英文摘要	Drainage divide migration is of wide interest because it drives changes in topography, aquatic species habitat, and fluxes of water and nutrients across Earth's surface. To date, divide migration rates have been measured in relatively few places, partly because of the rarity of denudation rate measurements on opposing sides of drainage divides. Here we report 54 basin-averaged denudation rates across the Qilian Shan, China, inferred from 10Be concentrations in stream-borne quartz. We combine these with 18 previously published basin-averaged denudation rates and new measurements of the topographic metric χ in the river networks. These data reveal divide migration rates of ∼3–1385 mm kyr−1 and area loss in the headwater reach of the Hei River basin. Cross-divide differences in denudation rate (ΔE) and channel-head χ values (Δχ) follow an exponential relationship ΔE=ΔE0e−bΔχ, providing empirical support for the hypothesis that Δχ values can reflect ΔE. Here, b has the same value within uncertainty as in ΔE-Δχ data in the southern Appalachians and the Ozark Dome in previous studies, consistent with a common set of processes controlling divide migration in all three regions. The value of ΔE0 is 1-2 orders of magnitude higher at Qilian Shan than at the two other sites, implying higher values of ΔE at a given Δχ. Our numerical simulations show that near-exponential ΔE-Δχ relationships can arise as topographic divides approach equilibrium under spatially uniform uplift rate, consistent with divide migration toward steady state in each of these regions. Further, they show that the magnitude of ΔE at a given Δχ increases linearly with rock uplift rate. Together, these results suggest that ln(ΔE) exhibits the same sensitivity to Δχ across mountain ranges, and that the magnitude of ΔE may be strongly sensitive to rock uplift rate. © 2021 Elsevier B.V.
关键词	channel network cosmogenic nuclide denudation rate drainage divide migration Qilian Shan topographic disequilibrium
英文关键词	Catchments; Digital storage; Rivers; Topography; Channel network; Cosmogenic nuclides; Denudation rates; Divide difference; Drainage divide migration; Exponentials; Migration rates; Qilian Shan; Rock uplift rates; Topographic disequilibrium; Erosion; channel morphology; cosmogenic radionuclide; denudation; drainage basin; headwater; numerical model; quartz; sediment transport; uncertainty analysis; China; Gansu; Heihe Basin; Qilian Mountains
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203139
作者单位	Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States; CAS Center for Excellence in Tibetan Plateau Earth Sciences, CAS Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47905, United States; School of Geography, Nanjing Normal University, Jiangsu, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application, Jiangsu, Nanjing, 210023, China
推荐引用方式 GB/T 7714	Hu K.,Fang X.,Ferrier K.L.,et al. Covariation of cross-divide differences in denudation rate and χ: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet[J],2021,562.
APA	Hu K.,Fang X.,Ferrier K.L.,Granger D.E.,Zhao Z.,&Ruetenik G.A..(2021).Covariation of cross-divide differences in denudation rate and χ: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet.Earth and Planetary Science Letters,562.
MLA	Hu K.,et al."Covariation of cross-divide differences in denudation rate and χ: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet".Earth and Planetary Science Letters 562(2021).