Orbital-scale East Asian monsoon variability since the last interglacial inferred from the sediments of Lake Suigetsu, Japan

作者：Alexander Francke, Jonathan Tyler, Richard A. Staff, Danielle McLean, Vanessa Nowinski, Megumi Saito-Kato, John Tibby, Minoru Ikehara, Yūsuke Yokoyama, Katsuya Gotanda, Tsuyoshi Haraguchi, Takeshi Nakagawa · 发表于：Quaternary Science Reviews · 年份：2025 · DOI：10.1016/j.quascirev.2025.109566 · 被引用次数：3 · 研究领域：Geology and Paleoclimatology Research、Pleistocene-Era Hominins and Archaeology、Isotope Analysis in Ecology

Orbital-scale climate variability in East Asia since the last interglacial period is often thought to be tied to summer precession-forced variability of the East Asian monsoon system, but this interpretation is increasingly being challenged. We present a new palaeoclimate record based on total organic carbon (TOC), total nitrogen (TN), TOC/TN ratios, and carbon isotope analyses of organic carbon (δ 13 C org ) from Lake Suigetsu (Japan) back to 146 ka. We extend the Lake Suigetsu sediment chronology beyond the well-constrained radiocarbon limit based on (1) tephrochronology, and (2) tephrostratigraphy. Finally (3), we carefully test the hypothesis that the common pattern in Cryptomeria pollen concentration between Lake Suigetsu and marine core MD01-2421 located in the northern Pacific Ocean can be used to refine our chronology.scales. Sediment deposition between 146 and 120 ka is heavily influenced by the early tectonic formation of Lake Suigetsu, as indicated by alternating deposition of peat and occasionally limited clay. Since 120 ka, spectral and wavelet analyses in concert with cross-wavelet analyses against ice core, marine, and atmospheric greenhouse gas concentration records, and moving window correlation analyses against transient climate model data, provide insights into a complex interplay between palaeoclimate conditions in central Japan and orbital and atmospheric circulation forcing. We find a strong correspondence between Lake Suigetsu proxy data, modelled winte...