气候变化领域集成服务门户(CCPortal): Nonlinear forcing of climate on mountain denudation during glaciations

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DOI	10.1038/s41561-020-00672-2
	Nonlinear forcing of climate on mountain denudation during glaciations
	Mariotti A.; Blard P.-H.; Charreau J.; Toucanne S.; Jorry S.J.; Molliex S.; Bourlès D.L.; Aumaître G.; Keddadouche K.
发表日期	2021
ISSN	17520894
起始页码	16
结束页码	22
卷号	14 期号:1
英文摘要	Denudation is one of the main processes that shapes landscapes. Because temperature, precipitation and glacial extents are key factors involved in denudation, climatic fluctuations are thought to exert a strong control on this parameter over geological timescales. However, the direct impacts of climatic variations on denudation remain controversial, particularly those involving the Quaternary glacial cycles in mountain environments. Here we measure in situ cosmogenic 10Be concentration in quartz in marine turbidites of two high-resolution cores collected in the Mediterranean Sea, providing a near-continuous (temporal resolution of ~1–2 kyr) reconstruction of denudation in the Southern Alps since 75 kyr ago (ka). This high-resolution palaeo-denudation record can be compared with well-constrained climatic variations over the last glacial cycle. Our results indicate that total denudation rates were approximately two times higher than present during the Last Glacial Maximum (26.5–19 ka), the glacial component of the denudation rates being 1.5−1.0+0.9 mm yr−1. However, during moderately glaciated times (74–29 ka), denudation rates were similar to those today (0.24 ± 0.04 mm yr−1). This suggests a nonlinear forcing of climate on denudation, mainly controlled by the interplay between glacier velocity and basin topography. Hence, the onset of Quaternary glaciations, 2.6 million years ago, did not necessarily induce a synchronous global denudation pulse. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	climate forcing; climate variation; denudation; glaciation; Last Glacial Maximum; marine environment; mountain region; paleoclimate; timescale; turbidite; Mediterranean Sea; New Zealand; South Island; Southern Alps
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/206934
作者单位	CNRS, Université de Lorraine, CRPG, Nancy, France; Laboratoire de Glaciologie, DGES-IGEOS, Université Libre de Bruxelles, Bruxelles, Belgium; IFREMER, Laboratoire Géodynamique et Enregistrement Sédimentaire, Plouzané, France; Laboratoire Géosciences Océan, Institut Universitaire Européen de la Mer, Plouzané, France; Aix-Marseille Univ., CNRS, IRD, INRA, Coll. France, UM 34 CEREGE, Technopôle de l’Environnement Arbois-Méditerranée, Aix-en-Provence, France
推荐引用方式 GB/T 7714	Mariotti A.,Blard P.-H.,Charreau J.,et al. Nonlinear forcing of climate on mountain denudation during glaciations[J],2021,14(1).
APA	Mariotti A..,Blard P.-H..,Charreau J..,Toucanne S..,Jorry S.J..,...&Keddadouche K..(2021).Nonlinear forcing of climate on mountain denudation during glaciations.Nature Geoscience,14(1).
MLA	Mariotti A.,et al."Nonlinear forcing of climate on mountain denudation during glaciations".Nature Geoscience 14.1(2021).