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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. (2021). Nonlinear forcing of climate on mountain denudation during glaciations. Nature Geoscience 14(1): 16-22. https://dx.doi.org/10.1038/s41561-020-00672-2
In: Nature Geoscience. Nature Publishing Group: London. ISSN 1752-0894; e-ISSN 1752-0908, more
Peer reviewed article  
Available in  Authors 
Authors  Top 
  • Mariotti, A.
  • Blard, P.-H., more
  • Charreau, J.
  • Toucanne, S.
  • Jorry, S.J.
  • Molliex, S.
  • Bourlès, D.L.
  • Aumaître, G.
  • Keddadouche, K.
Abstract
    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