| DOI: | 10.1038/s41561-020-00672-2
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| 论文题名: | Nonlinear forcing of climate on mountain denudation during glaciations |
| 作者: | Mariotti A.; Blard P.-H.; Charreau J.; Toucanne S.; Jorry S.J.; Molliex S.; Bourlès D.L.; Aumaître G.; Keddadouche K.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2021
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| 卷: | 14, 期:1 | | 起始页码: | 16
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| 结束页码: | 22
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| 语种: | 英语
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| 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
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| 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. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/169790
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| Appears in Collections: | 气候变化与战略
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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
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| Recommended Citation: | |
Mariotti A.,Blard P.-H.,Charreau J.,et al. Nonlinear forcing of climate on mountain denudation during glaciations[J]. Nature Geoscience,2021-01-01,14(1)
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