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.

剥蚀是塑造景观的主要过程之一。由于温度、降水和冰川范围是参与剥蚀的关键因素，因此气候波动被认为在地质时间尺度上对该参数施加了强有力的控制。然而，气候变化对剥蚀的直接影响仍然存在争议，特别是那些涉及山地环境中第四纪冰川循环的影响。在这里，我们就地测量宇宙成因¹⁰在地中海收集的两个高分辨率岩心的海洋混浊岩中的石英浓度，提供了自 75 kyr 前 (ka) 以来南阿尔卑斯山的近连续（约 1-2 kyr 的时间分辨率）的剥蚀重建。这种高分辨率的古剥蚀记录可以与上一个冰期周期内受到良好约束的气候变化进行比较。我们的结果表明，总剥蚀率大约是末次盛冰期（26.5-19 ka）期间的两倍，剥蚀率的冰川成分为\(1.5_{ - 1.0}^{ + 0.9}\)  mm年^-1。然而，在中度冰川时期（74-29 ka），剥蚀率与今天相似（0.24 ± 0.04 mm yr ^{- 1}）。这表明气候对剥蚀的非线性强迫，主要由冰川速度和盆地地形之间的相互作用控制。因此，260 万年前第四纪冰川作用的开始并不一定会引发同步的全球剥蚀脉冲。