气候变化领域集成服务门户(CCPortal): Late Cenozoic climate change paces landscape adjustments to Yukon River capture

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DOI	10.1038/s41561-020-0611-4
	Late Cenozoic climate change paces landscape adjustments to Yukon River capture
	Bender A.M.; Lease R.O.; Corbett L.B.; Bierman P.R.; Caffee M.W.; Rittenour T.M.
发表日期	2020
ISSN	17520894
起始页码	571
结束页码	575
卷号	13 期号:8
英文摘要	Late Cenozoic cooling and changes in glacial–interglacial cycle tempo are thought to increase global rates of erosion starting ~3 million years ago (Ma). Bedrock rivers set rates and patterns of erosion in most landscapes, but constraints on river response to late Cenozoic climate change remain elusive. Here, we determine cosmogenic isotope and luminescence ages of well-preserved bedrock terraces along the Fortymile River (Yukon River basin) to reconstruct an ~5 Myr history of fluvial adjustment to late Cenozoic climate and Yukon River headwater capture at 2.6 Ma. Post-capture Yukon River downcutting lowered the Fortymile River outlet, forcing subsequent bedrock incision throughout the Fortymile basin in two pulses, from 2.4 to 1.8 Ma and at ~1 Ma. These pulses of incision disrupted longer intervals of slow river channel sedimentation under near-consistent climate forcing from 4.8 to 2.4 Ma and from 1.8 to ~1 Ma. The Fortymile River delivers sediment to the Bering Sea, where provenance and accumulation rate changes since 4.3 Ma match observed variations in incision. Our results link alluviation and incision to late Cenozoic climate steadiness and change, respectively, and support the hypothesis that climate-forced changes in precipitation and runoff fundamentally control the pace of river incision and landscape erosion. © 2020, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
英文关键词	bedrock; Cenozoic; climate change; climate forcing; cooling; glacial-interglacial cycle; headwater; landscape change; luminescence dating; paleoclimate; precipitation (climatology); reconstruction; river channel; runoff; sedimentation; Alaska; Bering Sea; Fortymile River; Pacific Ocean; United States; Yukon River
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206747
作者单位	US Geological Survey, Alaska Science Center, Anchorage, AK, United States; Department of Geology, University of Vermont, Burlington, VT, United States; Department of Physics and Astronomy and Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IL, United States; Department of Geosciences and USU Luminescence Lab, Utah State University, Logan, UT, United States
推荐引用方式 GB/T 7714	Bender A.M.,Lease R.O.,Corbett L.B.,et al. Late Cenozoic climate change paces landscape adjustments to Yukon River capture[J],2020,13(8).
APA	Bender A.M.,Lease R.O.,Corbett L.B.,Bierman P.R.,Caffee M.W.,&Rittenour T.M..(2020).Late Cenozoic climate change paces landscape adjustments to Yukon River capture.Nature Geoscience,13(8).
MLA	Bender A.M.,et al."Late Cenozoic climate change paces landscape adjustments to Yukon River capture".Nature Geoscience 13.8(2020).