Transient evolution and adjustment to changing tectonic and climatic boundary conditions is an essential attribute of landscapes, and characterizing transient behavior is a key to understanding their dynamics and history. Developing new approaches to detect such transience has been explored by various methods, in particular to identify landscape response to Late Cenozoic and Quaternary climatic changes. Such studies have often focused on regions of high relief and/or active tectonic activity where interferences between tectonic and climatic signals might complicate the interpretation of the observations. We investigated the case of the hillslopes of the Serra do Cipó quartzitic range in SE Brazil in order to detect and quantify transience in a tectonically quiescent landscape over 100-ka timescales. We determined hilltop curvature from a high-resolution digital surface model derived from Pléiades imagery and measured cosmogenic nuclide (¹⁰Be and ²⁶Al) concentrations at these hilltop sites. We compare both observations with predictions of hillslope diffusion theory, observing a distinctive signature of an acceleration of denudation. We performed a joint inversion of topographic and isotopic data to retrieve an evolution of the hillslope sediment transport coefficient through time. The timing of the increase in denudation cannot be unequivocally associated with a single climatic event but is consistent with important, climatically modulated fluctuations in precipitation and erosion in this area during the Middle and Late Pleistocene.

中文翻译：

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缓慢演化景观中的瞬态山坡侵蚀

瞬态演化和对不断变化的构造和气候边界条件的调整是景观的基本属性，表征瞬态行为是了解其动态和历史的关键。已经通过各种方法探索了开发检测这种瞬态的新方法，特别是识别对晚新生代和第四纪气候变化的景观响应。此类研究通常集中在地势高和/或构造活动活跃的地区，其中构造和气候信号之间的干扰可能会使观测结果的解释复杂化。我们调查了巴西东南部 Serra do Cipó 石英岩山脉的山坡案例，以检测和量化 100 ka 时间尺度上构造静止景观中的瞬变。¹⁰ Be 和²⁶ Al) 在这些山顶地点的浓度。我们将两个观察结果与山坡扩散理论的预测进行比较，观察到剥蚀加速的独特特征。我们执行了地形和同位素数据的联合反演，以检索山坡沉积物输送系数随时间的演变。剥蚀增加的时间不能明确与单一气候事件相关，但与中更新世和晚更新世期间该地区降水和侵蚀的重要气候调节波动一致。