Record of paleo water divide locations reveals intermittent divide migration and links to paleoclimate proxies

• 成果类型: Article
• 署名作者: Harel, Elhanan; Goren, Liran; Crouvi, Onn; Porat, Naomi; Qu, Tianyue; Ginat, Hanan; Shelef, Eitan
• 署名单位: Ben-Gurion University of the Negev; Geological Survey Israel; Pennsylvania Commonwealth System of Higher Education (PCSHE); University of Pittsburgh
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-12945
• DOI: 10.1073/pnas.2408426122
• 发表日期: 2025-03-11
• 关键词: drainage-basin; EVOLUTION; reorganization; desert; deformation; DYNAMICS; erosion; SYSTEM; valley; soils

摘要

Drainage divide migration alters the geometry of drainage basins, influencing the distribution of water, erosion, sediments, and ecosystems across Earth's surface. The rate of divide migration is governed by differences in erosion rates across the divide and is thus sensitive to spatiotemporal variations in tectonics and climate. However, established approaches for quantifying divide migration rates offer only indirect evidence for the motion of the divide and provide only migration rate averages. Consequently, transience in divide migration cannot be resolved, hindering the ability to explore environmental changes that drive the dynamics of such potential transience. Here, we study a set of datable terraces identified as markers of paleo-divide locations, which provide direct evidence for the paleo motion of the divide. The location and age of the terraces reveal intermittent divide migration at timescales of 104 to 105 y, with phases of rapid migration-at rates more than twice the average-which coincide with documented regional paleoclimate fluctuations. These findings highlight the intermittent nature of divide migration dynamics over geomorphic timescales and its potential sensitivity to climate changes, underscoring the impact of such changes on the planform evolution of drainage basins.