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

CCPortal

DOI	10.1016/j.epsl.2021.116812
	Covariation of cross-divide differences in denudation rate and chi: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet
	Hu, Kai; Fang, Xiaomin; Ferrier, Ken L.; Granger, Darryl E.; Zhao, Zhijun; Ruetenik, Gregory A.
通讯作者	Hu, K ; Fang, XM (通讯作者)
发表日期	2021
ISSN	0012-821X
EISSN	1385-013X
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 Be-10 concentrations in stream-borne quartz. We combine these with 18 previously published basin-averaged denudation rates and new measurements of the topographic metric chi in the river networks. These data reveal divide migration rates of similar to 3-1385 mm kyr(-1) and area loss in the headwater reach of the Hei River basin. Cross-divide differences in denudation rate (Delta E) and channel-head chi values (Delta chi) follow an exponential relationship Delta E = Delta E(0)e(-b Delta chi), providing empirical support for the hypothesis that Delta chi values can reflect Delta E. Here, b has the same value within uncertainty as in Delta E-Delta chi 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 Delta E-0 is 1-2 orders of magnitude higher at Qilian Shan than at the two other sites, implying higher values of Delta E at a given Delta chi. Our numerical simulations show that near-exponential Delta E-Delta chi 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 Delta E at a given Delta chi increases linearly with rock uplift rate. Together, these results suggest that ln(Delta E) exhibits the same sensitivity to Delta chi across mountain ranges, and that the magnitude of Delta E may be strongly sensitive to rock uplift rate. (C) 2021 Elsevier B.V. All rights reserved.
关键词	COSMOGENIC NUCLIDE PRODUCTION EROSION RATES LANDSCAPE EVOLUTION CLIMATIC CONTROL RIVER CAPTURE PLATEAU MOUNTAINS MIGRATION GROWTH MARGIN
英文关键词	drainage divide migration; topographic disequilibrium; channel network; cosmogenic nuclide; denudation rate; Qilian Shan
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000636736200002
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260516
推荐引用方式 GB/T 7714	Hu, Kai,Fang, Xiaomin,Ferrier, Ken L.,et al. Covariation of cross-divide differences in denudation rate and chi: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet[J]. 中国科学院青藏高原研究所,2021,562.
APA	Hu, Kai,Fang, Xiaomin,Ferrier, Ken L.,Granger, Darryl E.,Zhao, Zhijun,&Ruetenik, Gregory A..(2021).Covariation of cross-divide differences in denudation rate and chi: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet.EARTH AND PLANETARY SCIENCE LETTERS,562.
MLA	Hu, Kai,et al."Covariation of cross-divide differences in denudation rate and chi: Implications for drainage basin reorganization in the Qilian Shan, northeast Tibet".EARTH AND PLANETARY SCIENCE LETTERS 562(2021).